- Original article
- Open Access
Overexpression of CsLEA11, a Y3SK2-type dehydrin gene from cucumber (Cucumis sativus), enhances tolerance to heat and cold in Escherichia coli
AMB Express volume 7, Article number: 182 (2017)
As the group II LEA (late embryogenesis abundant) proteins, dehydrins (DHNs) play an important role in plant growth and development, as well as in response to abiotic or biotic stress challenges. In this study, a DHN gene named CsLEA11 was identified and characterized from Cucumis sativus. Sequence analysis of CsLEA11 showed that it is a Y3SK2-type DHN protein rich in hydrophilic amino acids. Expression analyses revealed that the transcription of CsLEA11 could be significantly induced by heat and cold stress. The recombinant plasmid was transformed into Escherichia coli BL21 and isopropy-β-d-thiogalactoside (IPTG) was used to induce recombinant E. coli to express CsLEA11 gene. Overexpression of CsLEA11 in E. coli enhanced cell viability and conferred tolerance to heat and cold stress. Furthermore, CsLEA11 protein could protect the activity of lactate dehydrogenase (LDH) under heat stress. Taken together, our data demonstrate that CsLEA11 might function in tolerance of cucumber to heat and cold stress.
Temperature is one of the major factors affecting plant growth and productive capacity (Guo et al. 2017). Higher plants have evolved a variety of strategies for continuous changes to deal with the unfavorable stresses, such as heat and cold. For example, LEA (late embryogenesis abundant) proteins are synthesized in large amounts during the late stages of seed development, enabling the maturing seeds to acquire desiccation tolerance, which plays an important role in the adaptation of plants to abiotic stresses (Hu et al. 2016; Tang et al. 2016; Tolleter et al. 2007).
As the group II LEA, dehydrins (DHNs) are highly hydrophilic proteins, and contain three conserved motifs named as K-, Y-, and S-segments. Based on the numbers of Y-, S- and K-segments, DHNs can be subdivided into five major types, including YnSKn, Kn, SKn, YnKn, and KnS (Close 1996; Lv et al. 2017). Since DHN genes are expressed in various plant tissues including roots, stems, leaves, flowers, fruits and seeds, different types of DHN genes may be involved in response to diverse abiotic stresses including heat and cold (Abedini et al. 2017; Charfeddine et al. 2017; Jing et al. 2016; Verma et al. 2017). For example, the expression of three DHN genes was detected in sugarcane under heat stress, and their expression is independent of the changes in the water relations of leaves (Wahid and Close 2007). Both Grapevine DHN1 and DHN2 are induced by heat and cold, but their expression profiles differ appreciably from each other (Yang et al. 2012). In Tifway, CdDHN4 is greatly up-regulated by heat and cold treatments, and its expression under cold treatment is significantly higher than that under heat treatment (Lv et al. 2017).
There are increasing evidences showing that there are extensive correlative links between DHNs and tolerance to heat or cold stress in organisms. For example, wheat DHN-5 is able to protect enzyme activities in vitro from adverse effects induced by heating (Brini et al. 2010). Wheat WZY2 can act as a protectant to increase Escherichia coli viability, protect lactate dehydrogenase (LDH) activity and inhibit protein aggregation during temperature variation including heat and cold (Yang et al. 2015). A number of studies have shown that the cold stress tolerance was enhanced by overexpression of different DHNs in various plant species, such as Arabidopsis (Aguayo et al. 2016; Ochoa-Alfaro et al. 2012; Peng et al. 2008), tobacco (Guo et al. 2017; Hill et al. 2016; Liu et al. 2014; Xing et al. 2011), strawberry (Houde et al. 2004), cucumber (Yin et al. 2006), and tomato (Liu et al. 2015), suggesting their possible functions in cold stress. Besides, loss of function of some DHN genes can also decrease the cold stress tolerance of transgenic plants. For example, silencing of either CaDHN1 or CaDHN3 in pepper resulted in obviously lower resistance to cold stress compared with the control (Chen et al. 2015; Jing et al. 2016).
A previous study examined the LEA gene family in cucumber and found that one of DHN genes named CsLEA54 might facilitate the adaptation of cucumber to drought stress (Altunoglu et al. 2016). In this study, we isolated another DHN gene, CsLEA11, and examined its expression under heat and cold stress. Recombinant CsLEA11 protein was expressed and purified from E. coli. E. coli overexpressing CsLEA11 showed significantly improved tolerance to heat and cold stress. The effect of CsLEA11 protein on LDH activity under heat stress was also examined in vitro.
Materials and methods
Plant materials and treatments
Two-week-old cucumber (Cucumis sativus L. cv. Chinese long No. 9930) seedlings were grown in a growth chamber under a long-day (16 h of light/8 h of dark) photoperiod at 400 µmol m−2 s−1 light intensity and a relative humidity of 60–70%. For heat and cold treatment, cucumber seedlings in the growth chamber were subjected to 42 and 4 °C under normal light conditions. The leaf tissues were harvested from seedling samples at 0, 3, 6, 12 and 24 h, frozen in liquid nitrogen immediately, and stored at −80 °C until use.
Isolation and sequence analysis of CsLEA11
Total RNA was extracted from leaves using Trizol reagent according to the manufacturer’s instructions (Tiangen, China). The quality of the extracted RNA was examined by agarose gel electrophoresis. The first strand cDNA was synthesized using the Superscript™ III RNase H-Reverse Transcriptase kit (Invitrogen, USA). The full-length cDNA sequence of CsLEA11 was amplified using gene-specific primers designed according to the cucumber genome initiative (CuGI, http://cucumber.genomics.org.cn, Gene ID: Csa020767), and NCBI database (GenBank Accession Number: XM_004150027.2). The PCR product was cloned into the pGEM-T (Promega, USA) and subsequently sequenced.
The theoretical pI, MW and the grand average of hydropathy index (GRAVY) of the deduced CsLEA11 protein were predicted by the ProtParam program (http://web.expasy.org/protparam). The prediction of protein secondary structure and intrinsic disorder in the deduced CsLEA11 protein was performed by the PHYRE2 protein fold recognition server (http://www.sbg.bio.ic.ac.uk/phyre2/html/page.cgi?id=index). The multiple sequence alignments of CsLEA11 and other dehydrin proteins were performed with Clustal W software (Larkin et al. 2007). A phylogenetic tree was then constructed with the MEGA 5.0 software by the neighbor-joining method with 1000 bootstrap replicates (Tamura et al. 2007).
Quantitative real-time PCR (qRT-PCR)
Quantitative real-time PCR (qRT-PCR) was performed with SYBR premix Ex Taq kit (TaKaRa, Japan) according to the manufacturer’s instructions. Amplification was carried out on the LightCycler 480 System (Bio-Rad, USA). Each PCR mixture was composed of 10 μL of 1× SYBR premix Ex Taq, 0.1 μL of reverse and forward primers (0.5 μM each) and 2 μL of cDNA, and was added up to 20 μL with nuclease-free water. The procedure was implemented as follows: 94 °C for 5 min, followed by 40 cycles of 94 °C for 5 s, 55 °C for 10 s, and 72 °C for 15 s. The relative expression level was calculated using the 2−ΔΔCT method (Livak and Schmittgen 2001), and the CT values were obtained from three independent biological replicates. An endogenous actin gene (CsAct3, GenBank Accession Number: DQ115883) was used as an internal reference (Wan et al. 2010). The primers are listed in Table 1.
Induction and expression of CsLEA11 protein
To amplify the coding sequence of CsLEA11, the primers 5′-aaaaGGATCCATGGCGAATGTACGCGATGAG-3′ (BamH I restriction site underlined) and 5′-aaaaAAGCTTATGATGGTGGCCAGGTAATTTC-3′ (Hind III restriction site underlined) were designed. PCR amplification was conducted using the following protocol: pre-denaturation for 5 min at 94 °C, 30 cycles at 94 °C for 30 s, 58 °C for 30 s, 72 °C for 30 s, followed by 1 cycle at 72 °C for 10 min. Then the PCR product was cloned into pET32a, the resulting construct (pET32a-CsLEA11) was confirmed by sequencing and transformed into the E. coli host strain BL21 (DE3). The cells with pET32a-CsLEA11 and pET32a plasmids were induced with IPTG (1 mM) at 37 °C for 4 h and analyzed by SDS-PAGE as previously described (Zhou et al. 2017).
Assay of heat and cold stress tolerance of E. coli transformants
Stress tolerance assays were performed to detect the effect of CsLEA11 on E. coli viability under heat and cold stress conditions. IPTG induction and cell cultures were prepared as described above until the optical density (OD600) was adjusted to 0.6. Subsequently, 2 mL of the IPTG-induced transformant strains were inoculated into 50 mL fresh liquid LB with 1 mM IPTG and 50 μg/mL ampicillin, and the initial concentration was adjusted to the same OD600 for each stress. E. coli cells containing pET32a-CsLEA11 and pET32a (as a control) were named as BL/CsLEA11 and BL/pET32a, respectively. For heat stress, 1 mL of culture medium was incubated at 50 °C for different periods of time (10, 20, 30, 40 and 50 min), and then 100 μL of dilution (1:10) was spread onto LB agar plates with 1 mM IPTG and 50 μg/mL ampicillin. The cold stress tolerance assay of E. coli transformants was performed using the method of a previous study (Hu et al. 2016). In brief, a 1-mL aliquot of the BL/CsLEA11 and BL/pET32a cells was frozen in liquid nitrogen for 1 min, and then thawed for 15 min at 37 °C, which made a cycle. The aliquots were taken after 3, 6, 9, 12 and 15 cycles, respectively, and then 100 µL of dilution (1:10) was spread onto LB agar plates with 1 mM IPTG and 50 μg/mL ampicillin. After incubation overnight at 37 °C, the cell viability was calculated by counting the number of colony-forming units as previously described (Zhou et al. 2017).
LDH activity assay
The LDH enzyme (EC126.96.36.199) from muscle lactate (Sigma, USA) was diluted to a final concentration of 1 mg/mL in phosphate buffer saline (PBS). The thermal treatment and measurement of LDH activity were carried out according to the previously published method (Zhou et al. 2017). The purified CsLEA11 protein was added to LDH at the mass ratio of 1:5, and PBS and BSA were used as negative and positive controls, respectively. Each experiment was performed in triplicate.
All statistical analyses were performed using the Statistical Package for Social Sciences (SPSS 19.0) with Student’s t test in a two-tailed analysis, and statistical significance was set at *P < 0.05 and **P < 0.01.
Clone and sequence analysis of CsLEA11
A 846-bp cDNA fragment containing a 489-bp ORF was amplified from cucumber leaves by semi-quantitative RT-PCR. A sequence of 1614 bp was obtained from cucumber genomic sequence, which consists of two exons and one intron. This gene encodes a protein of 162 amino acids with a predicted theoretical isoelectric point and molecular weight of 8.11 and 17.47 kDa, respectively. According to a previous study, this gene was named as CsLEA11 (Altunoglu et al. 2016).
The CsLEA11 protein contains three Y-segments, one S-segment, and two K-segments. Therefore, it was classified as a Y3SK2-type DHN (Fig. 1). The CsLEA11 protein was rich in hydrophilic amino acids such as Thr (13.0%), Gly (10.5%), Ser (9.3%), Glu (8.6%), Lys (8.0%), and His (7.4%), but was lack of the hydrophobic amino acids Cys and Trp. The grand average of hydropathicity (GRAVY) of the deduced CsLEA11 protein was −1.230, indicating that it is strongly hydrophilic. In addition, in silico prediction with a protein secondary structure and intrinsic disorder tool (PHYRE2) suggested that over 84% of the amino acid residues of CsLEA11 were disordered, and CsLEA11 harbored 13% of alpha helices, which are mainly present in the two K-segments (Fig. 1). These results suggested that CsLEA11 is an intrinsically disordered protein (IDP).
Sequence alignment of the deduced amino acid sequence of CsLEA11 with that of other DHNs indicated that it was homologous to sequences from Cucumis melo (XP_008460975.1, 86.5% identity), Dorcoceras hygrometricum (KZV53366.1, 53.8% identity), Morus notabilis (XP_010105346.1, 53.1% identity), Vitis vinifera (VvDHN4, XP_002283605.1, 49.7% identity), and Manihot esculenta (AGC51773.1, 48.9% identity). Sequence alignment results of CsLEA11 and these closely related DHNs are shown in Fig. 2, which further confirmed that CsLEA11 is a Y3SK2-type DHN protein. In addition, both the Y- and K-segments were slightly different from the reported consensus sequences (DEYGNP and EKKGIMDKIKEKLPG, respectively) with a few conservative substitutions (Fig. 2).
In order to evaluate the molecular evolutionary relationships between CsLEA11 and DHN proteins from other plant species, a phylogenetic tree was constructed (Fig. 3). The results showed that these DHNs could be divided into five groups: YnSKn, YK, SKn, Kn, and KS. CsLEA11 shares high genetic homology with two Arabidopsis genes At4g39130 and At2g21490, which belong to the YK and YnSKn group, respectively (Fig. 3).
Transcript analysis of CsLEA11 under heat and cold stress
To determine the expression of CsLEA11 under heat and cold stress, the transcript of CsLEA11 was analyzed by qRT-PCR. Under heat stress, the transcript level of CsLEA11 first increased with time and peaked at 6 h (35.6-fold), then decreased to 11.0-fold at 12 h, and was finally detected to be 22.6-fold at 24 h. However, contrary to the case of heat stress treatment, the transcripts of CsLEA11 under cold stress decreased with time until 6 h, reached the maximum level at 12 h (12.7-fold), and then decreased at 24 h (Fig. 4b).
Induction of fusion protein of CsLEA11 in E. coli cells
The CsLEA11 protein was expressed in E. coli BL21 (DE3) and analyzed by SDS-PAGE. As shown in Fig. 5, compared with non-induced cells, cells of E. coli harboring pET32a vector (BL/pET32a) produced TrxA protein of 21.1 kDa, which is consistent with the results of previous studies (Hu et al. 2016; Zhou et al. 2017). The fusion protein presented a molecular weight of about 40 kDa, which is identical with the expected size (Fig. 5, lane 5), and this band was not detected in non-induced BL/CsLEA11 cells (Fig. 5, lane 4), indicating that the TrxA-CsLEA11 fusion protein was correctly expressed in recombinant E. coli.
CsLEA11 overexpression enhanced E. coli growth under heat and cold stress
To assess the effect of CsLEA11 on the growth of E. coli recombinants under heat and cold stress, BL/CsLEA11 and BL/pET32a cells were subjected to heat and cold treatment, respectively. Under normal conditions, the growth pattern of BL/CsLEA11 cells was similar to that of BL/pET32a (Fig. 6), implying that the expression of CsLEA11 protein does not affect the growth of the E. coli recombinant. Under heat treatment, the cell viability of BL/CsLEA11 and BL/pET32a cells decreased rapidly. However, the cells of BL/CsLEA11 showed greater proliferation than those of BL/pET32a at the time points of 10, 20, 30 and 40 min, and both of types of cells died at 50 min (Fig. 6a). Similar results were observed under cold treatment (Fig. 6b). After 3, 6, 9 and 12 freeze–thaw cycles, the cell viability of BL/CsLEA11 cells was about 89.5, 29.3, 15.6, and 1.1%, respectively, whereas that of the BL/pET32a cells was 50.1, 25.9, 10, and 0%, respectively. Similarly, both BL/CsLEA11 and BL/pET32a cells died after 15 freeze–thaw cycles (Fig. 6b). These results indicated that CsLEA11 confers tolerance to heat and cold stress in E. coli.
CsLEA11 protected LDH enzyme activity under heat stress
LDH activity was used as a marker to evaluate the protective effect of CsLEA11 against heat stress. As shown in Fig. 7, the activity of LDH sharply decreased after treatment at 65 °C for 15 min or 30 min with or without CsLEA11. In contrast to that of negative control (PBS), the loss of LDH activity in the presence of CsLEA11 and positive control (BSA) was much slower. After the treatment at 65 °C for 15 min, the LDH activity decreased to 16.9, 55.4 and 48.8% of its initial value in the presence of PBS, BSA and CsLEA11, respectively. Additionally, LDH activity with PBS decreased to 15.0%, whereas it remained to be 30.0 and 28.2% of its initial value upon incubation for 30 min in the presence of CsLEA11 and BSA, respectively. Under heat stress, although the LDH activity in the presence of CsLEA11 also decreased, it was still 2.9- and 1.9-fold that in the presence of PBS at 15 and 30 min, respectively (Fig. 7). These results revealed that just like BSA, CsLEA11 can also efficiently protect LDH activity under heat stress.
Over the past few decades, numerous DHN genes have been identified in various plant species, and were demonstrated to play important roles in abiotic stress tolerance (Banerjee and Roychoudhury 2016; Liu et al. 2017). In this study, a DHN gene named CsLEA11 was for the first time isolated and characterized from C. sativus. Sequence alignment and phylogenetic analysis indicate that CsLEA11 belongs to the Y3SK2 group. Gene expression analyses are important for the revealing of gene functions. There are increasing evidences showing that DHN genes are regulated by various abiotic stresses including heat and cold (Lv et al. 2017; Wahid and Close 2007; Yang et al. 2012). In this study, the transcription of CsLEA11 was induced by heat and cold treatments (Fig. 4), implying a positive correlation between CsLEA11 and tolerance to heat or cold stress.
Heterologous expression is an easy and effective method to investigate the function of a protein in vivo with less time, energy and resources (Jabeen et al. 2017; Wang et al. 2017). Several recent studies have investigated the overexpression of DHN genes in E. coli cells to reveal their possible functions under stress conditions. For example, heterologous expression of CarDHN from Cerastium arcticum in E. coli resulted in increased intrinsic tolerance to cold stress (Kim et al. 2013). Overexpression of a dehydrin-like protein gene AmCIP from Ammopiptanthus mongolicus conferred cold stress tolerance to E. coli (Shi et al. 2016). A recent study reported that the E. coli cells expressing some Pinus tabuliformis DHN proteins showed enhanced viability and tolerance under salt and heat stress (Gao and Lan 2016). Another report also revealed that overexpression of Dofdehydrin-1 from Dendrobium officinale enhanced E. coli viability under salt and heat stress (Ling et al. 2016). Very recently, Bao et al. (2017) reported that the expression of nearly all of the Prunus mume dehydrins improved osmotic and cold resistance of the recombinant E. coli. In this study, recombinant E. coli cells overexpressing CsLEA11 showed higher cell viability than the control under heat and cold stress (Fig. 6), which is in agreement with previous results, implying that CsLEA11 might participate in adaptive responses to heat and cold stress.
A number of studies have demonstrated that many DHNs lack Cys and Trp residues and are rich of charged and polar amino acids (Close 1996; Jing et al. 2016; Yang et al. 2015). CsLEA11 also has these properties, which make it unstructured and highly hydrophilic, suggesting that it is an IDP (Fig. 1) (Dyson and Wright 2005). Because IDPs are lack of a unique and well-defined protein structure, they can function in the protection of other cellular proteins and stabilization of plant outer and organellar membranes under stress conditions (Jha et al. 2012; Rahman et al. 2010; Uversky and Dunker 2010). It has been shown that some DHNs can prevent the inactivation of malate dehydrogenase (MDH), LDH, alcohol dehydrogenase (ADH), catalase or citrate synthase (CS) enzymes under diverse stress conditions in vitro (Drira et al. 2013; Kovacs et al. 2008; Shi et al. 2016; Yang et al. 2015). For example, wheat DHN-5 is able to protect the activities of LDH, β-glucosidase and glucose oxidase from the adverse effects induced by cold and heat (Brini et al. 2010; Drira et al. 2013). Arabidopsis ERD10 (At1G20450) and ERD14 (At1G76180) were found to prevent the heat-induced aggregation and denaturation of lysozyme, alcohol dehydrogenase, firefly luciferase and citrate synthase (Kovacs et al. 2008). Another Arabidopsis dehydrin AtHIRD11 (At1G54410) can even reactivate the LDH inhibited by Cu2+ through removing Cu2+ from the active site (Hara et al. 2016). In the present study, CsLEA11 could protect the activity of LDH from heat-induced inactivation (Fig. 7). Similar results were also observed for DHN-5 (Brini et al. 2010) and WZY2 from wheat (Yang et al. 2015), and SbDhn2 from sorghum (Halder et al. 2016). Hence, CsLEA11 can protect E. coli exposed to heat and cold stress, probably via protection of some stress-related proteins from inactivation under stress conditions.
In conclusion, we have cloned and characterized a DHN gene named CsLEA11 from C. sativus. The expression of CsLEA11 is observably up-regulated by heat and cold treatment, and overexpression of CsLEA11 improves the growth performance of E. coli cells under heat and cold stress conditions. In addition, CsLEA11 protein can protect LDH activity in vitro from heat-induced inactivation. Our results show that CsLEA11 may have a potential in genetic improvement for plants to adapt to heat and cold stress.
late embryogenesis abundant
- E. coli :
quantitative real-time PCR
phosphate buffer saline
intrinsically disordered protein
Abedini R, GhaneGolmohammadi F, PishkamRad R, Pourabed E, Jafarnezhad A, Shobbar ZS, Shahbazi M (2017) Plant dehydrins: shedding light on structure and expression patterns of dehydrin gene family in barley. J Plant Res 130:747–763
Aguayo P, Sanhueza J, Noriega F, Ochoa M, Lefeuvre R, Navarrete D, Fernández M, Valenzuela S (2016) Overexpression of an SKn-dehydrin gene from Eucalyptus globulus and Eucalyptus nitens enhances tolerance to freezing stress in Arabidopsis. Trees 30:1785–1797
Altunoglu YC, Baloglu P, Yer EN, Pekol S, Baloglu MC (2016) Identification and expression analysis of LEA gene family members in cucumber genome. Plant Growth Regul 80:225–241
Banerjee A, Roychoudhury A (2016) Group II late embryogenesis abundant (LEA) proteins: structural and functional aspects in plant abiotic stress. Plant Growth Regul 79:1–17
Bao F, Du D, An Y, Yang W, Wang J, Cheng T, Zhang Q (2017) Overexpression of Prunus mume dehydrin genes in tobacco enhances tolerance to cold and drought. Front Plant Sci 8:151
Brini F, Saibi W, Amara I, Gargouri A, Masmoudi K, Hanin M (2010) Wheat dehydrin DHN-5 exerts a heat-protective effect on β-glucosidase and glucose oxidase activities. Biosci Biotechnol Biochem 74:1050–1054
Charfeddine S, Charfeddine M, Saïdi MN, Jbir R, Bouzid RG (2017) Potato dehydrins present high intrinsic disorder and are differentially expressed under ABA and abiotic stresses. Plant Cell Tissue Organ Cult 128:423–435
Chen RG, Jing H, Guo WL, Wang SB, Ma F, Pan BG, Gong ZH (2015) Silencing of dehydrin CaDHN1 diminishes tolerance to multiple abiotic stresses in Capsicum annuum L. Plant Cell Rep 34:2189–2200
Close TJ (1996) Dehydrins: emergence of a biochemical role of a family of plant dehydration proteins. Physiol Plant 97:795–803
Drira M, Saibi W, Brini F, Gargouri A, Masmoudi K, Hanin M (2013) The K-segments of the wheat dehydrin DHN-5 are essential for the protection of lactate dehydrogenase and β-glucosidase activities in vitro. Mol Biotechnol 54:643–650
Dyson HJ, Wright PE (2005) Intrinsically unstructured proteins and their functions. Nat Rev Mol Cell Biol 6:197–208
Gao J, Lan T (2016) Functional characterization of the late embryogenesis abundant (LEA) protein gene family from Pinus tabuliformis (Pinaceae) in Escherichia coli. Sci Rep 6:19467
Guo X, Zhang L, Zhu J, Liu H, Wang A (2017) Cloning and characterization of SiDHN, a novel dehydrin gene from Saussurea involucrata Kar. et Kir. that enhances cold and drought tolerance in tobacco. Plant Sci 256:160–169
Halder T, Agarwal T, Ray S (2016) Isolation, cloning, and characterization of a novel Sorghum dehydrin (SbDhn2) protein. Protoplasma 253:1475–1488
Hara M, Monna S, Murata T, Nakano T, Amano S, Nachbar M, Watzig H (2016) The Arabidopsis KS-type dehydrin recovers lactate dehydrogenase activity inhibited by copper with the contribution of His residues. Plant Sci 245:135–142
Hill W, Jin XL, Zhang XH (2016) Expression of an arctic chickweed dehydrin, CarDHN, enhances tolerance to abiotic stress in tobacco plants. Plant Growth Regul 80:323–334
Houde M, Dallaire S, N’Dong D, Sarhan F (2004) Overexpression of the acidic dehydrin WCOR410 improves freezing tolerance in transgenic strawberry leaves. Plant Biotechnol J 2:381–387
Hu T, Zhou N, Fu M, Qin J, Huang X (2016) Characterization of OsLEA1a and its inhibitory effect on the resistance of E. coli to diverse abiotic stresses. Int J Biol Macromol 91:1010–1017
Jabeen B, Naqvi SM, Mahmood T, Sultana T, Arif M, Khan F (2017) Ectopic expression of plant RNA chaperone offering multiple stress tolerance in E. coli. Mol Biotechnol 59:66–72
Jha B, Lal S, Tiwari V, Yadav SK, Agarwal PK (2012) The SbASR-1 gene cloned from an extreme halophyte Salicornia brachiata enhances salt tolerance in transgenic tobacco. Mar Biotechnol (NY) 14:782–792
Jing H, Li C, Ma F, Ma JH, Khan A, Wang X, Zhao LY, Gong ZH, Chen RG (2016) Genome-wide identification, expression diversication of dehydrin gene family and characterization of CaDHN3 in pepper (Capsicum annuum L.). PLoS ONE 11:e0161073
Kim IS, Kim HY, Kim YS, Choi HG, Kang SH, Yoon HS (2013) Expression of dehydrin gene from Arctic Cerastium arcticum increases abiotic stress tolerance and enhances the fermentation capacity of a genetically engineered Saccharomyces cerevisiae laboratory strain. Appl Microbiol Biotechnol 97:8997–9009
Kovacs D, Kalmar E, Torok Z, Tompa P (2008) Chaperone activity of ERD10 and ERD14, two disordered stress-related plant proteins. Plant Physiol 147:381–390
Larkin MA, Blackshields G, Brown NP, Chenna R, McGettigan PA, McWilliam H, Valentin F, Wallace IM, Wilm A, Lopez R, Thompson JD, Gibson TJ, Higgins DG (2007) Clustal W and Clustal X version 2.0. Bioinformatics 23:2947–2948
Ling H, Zeng X, Guo S (2016) Functional insights into the late embryogenesis abundant (LEA) protein family from Dendrobium officinale (Orchidaceae) using an Escherichia coli system. Sci Rep 6:39693
Liu J, Xu X, Xu Q, Wang S, Xu J (2014) Transgenic tobacco plants expressing PicW gene from Picea wilsonii exhibit enhanced freezing tolerance. Plant Cell Tissue Organ Cult 118:391–400
Liu H, Yu C, Li H, Ouyang B, Wang T, Zhang J, Wang X, Ye Z (2015) Overexpression of ShDHN, a dehydrin gene from Solanum habrochaites enhances tolerance to multiple abiotic stresses in tomato. Plant Sci 231:198–211
Liu Y, Song Q, Li D, Yang X, Li D (2017) Multifunctional roles of plant dehydrins in response to environmental stresses. Front Plant Sci 8:1018
Livak KJ, Schmittgen TD (2001) Analysis of relative gene expression data using real-time quantitative PCR and the 2−ΔΔCT method. Methods 25:402–408
Lv A, Fan N, Xie J, Yuan S, An Y, Zhou P (2017) Expression of CdDHN4, a Novel YSK2-type dehydrin gene from Bermudagrass, responses to drought stress through the ABA-dependent signal pathway. Front Plant Sci 8:748
Ochoa-Alfaro AE, Rodriguez-Kessler M, Perez-Morales MB, Delgado-Sanchez P, Cuevas-Velazquez CL, Gomez-Anduro G, Jimenez-Bremont JF (2012) Functional characterization of an acidic SK3 dehydrin isolated from an Opuntia streptacantha cDNA library. Planta 235:565–578
Peng Y, Reyes JL, Wei H, Yang Y, Karlson D, Covarrubias AA, Krebs SL, Fessehaie A, Arora R (2008) RcDhn5, a cold acclimation-responsive dehydrin from Rhododendron catawbiense rescues enzyme activity from dehydration effects in vitro and enhances freezing tolerance in RcDhn5-overexpressing Arabidopsis plants. Physiol Plant 134:583–597
Rahman LN, Chen L, Nazim S, Bamm VV, Yaish MW, Moffatt BA, Dutcher JR, Harauz G (2010) Interactions of intrinsically disordered Thellungiella salsuginea dehydrins TsDHN-1 and TsDHN-2 with membranes—synergistic effects of lipid composition and temperature on secondary structure. Biochem Cell Biol 88:791–807
Shi J, Liu M, Chen Y, Wang J, Lu C (2016) Heterologous expression of the dehydrin-like protein gene AmCIP from Ammopiptanthus mongolicus enhances viability of Escherichia coli and tobacco under cold stress. Plant Growth Regul 79:71–80
Tamura K, Dudley J, Nei M, Kumar S (2007) MEGA4: molecular evolutionary genetics analysis (MEGA) software version 4.0. Mol Biol Evol 24:1596–1599
Tang X, Wang H, Chu L, Shao H (2016) KvLEA, a new isolated late embryogenesis abundant protein gene from Kosteletzkya virginica responding to multiabiotic stresses. Biomed Res Int 2016:9823697
Tolleter D, Jaquinod M, Mangavel C, Passirani C, Saulnier P, Manon S, Teyssier E, Payet N, Avelange-Macherel MH, Macherel D (2007) Structure and function of a mitochondrial late embryogenesis abundant protein are revealed by desiccation. Plant Cell 19:1580–1589
Uversky VN, Dunker AK (2010) Understanding protein non-folding. Biochim Biophys Acta 1804:1231–1264
Verma G, Dhar YV, Srivastava D, Kidwai M, Chauhan PS, Bag SK, Asif MH, Chakrabarty D (2017) Genome-wide analysis of rice dehydrin gene family: its evolutionary conservedness and expression pattern in response to PEG induced dehydration stress. PLoS ONE 12:e0176399
Wahid A, Close TJ (2007) Expression of dehydrins under heat stress and their relationship with water relations of sugarcane leaves. Biol Plant 51:104–109
Wan H, Zhao Z, Qian C, Sui Y, Malik AA, Chen J (2010) Selection of appropriate reference genes for gene expression studies by quantitative real-time polymerase chain reaction in cucumber. Anal Biochem 399:257–261
Wang X, Zhang L, Zhang Y, Bai Z, Liu H, Zhang D (2017) Triticum aestivum WRAB18 functions in plastids and confers abiotic stress tolerance when overexpressed in Escherichia coli and Nicotiania benthamiana. PLoS ONE 12:e0171340
Xing X, Liu Y, Kong X, Liu Y, Li D (2011) Overexpression of a maize dehydrin gene, ZmDHN2b, in tobacco enhances tolerance to low temperature. Plant Growth Regul 65:109–118
Yang Y, He M, Zhu Z, Li S, Xu Y, Zhang C, Singer SD, Wang Y (2012) Identification of the dehydrin gene family from grapevine species and analysis of their responsiveness to various forms of abiotic and biotic stress. BMC Plant Biol 12:140
Yang W, Zhang L, Lv H, Li H, Zhang Y, Xu Y, Yu J (2015) The K-segments of wheat dehydrin WZY2 are essential for its protective functions under temperature stress. Front Plant Sci 6:406
Yin Z, Rorat T, Szabala BM, Ziołkowska A, Malepszy S (2006) Expression of a Solanum sogarandinum SK3-type dehydrin enhances cold tolerance in transgenic cucumber seedlings. Plant Sci 170:1164–1172
Zhou Y, Hu L, Jiang L, Liu H, Liu S (2017) Molecular cloning and characterization of an ASR gene from Cucumis sativus. Plant Cell Tissue Organ Cult 130:553–565
YZ, PH, YY, and SL conceived and designed the experiments. YZ, PH, YX, and QL performed the experiments. YZ, PH, YY, and SL performed the data analysis. YZ and SL wrote the paper. All authors read and approved the final manuscript.
We are grateful to Prof. Zuoxiong Liu (Huazhong Agricultural University) for critical reading of the manuscript.
The authors declare that they have no competing interests.
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This work was funded by the Key Project of Youth Science Foundation of Jiangxi Province (20171ACB21025), the Special Funds for Collaborative Innovation of Jiangxi Modern Agricultural Scientific Research (JXXTCX2015005-002), and the Science and Technology Project of Jiangxi Provincial Department of Education (GJJ150400).
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Zhou, Y., He, P., Xu, Y. et al. Overexpression of CsLEA11, a Y3SK2-type dehydrin gene from cucumber (Cucumis sativus), enhances tolerance to heat and cold in Escherichia coli . AMB Expr 7, 182 (2017). https://doi.org/10.1186/s13568-017-0483-1
- Cucumis sativus
- Dehydrin (DHN)
- Intrinsically disordered protein (IDP)
- Expression analysis
- Abiotic stress