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Cloning, expression analysis and In silico characterization of HSP101: a potential player conferring heat stress in Aegilops speltoides (Tausch) Gren

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Abstract

Heat shock protein (HSP101) function as molecular chaperones and confer thermotolerance to plants. In the present investigation, identification, comprehensive expression analysis, phylogeny and protein modelling of HSP101 gene has been done in Aegilops speltoides accession Pau3583. In the present study, we cloned and in silico characterized a HSP101C gene designated as AsHSP101C-Pau3583. AsHSP101C-Pau3583 is 4180 bp long with seven exons and six introns and encoded a polypeptide of 910 amino acids predicted by FGENESH. We have identified 58 SNPs between the AsHSP101C-Pau3583 and reference gene sequence extracted from Ae. speltoides TGAC assembly. Real-time RT-PCR analysis of expression levels of HSP101 gene in two wheat genotypes under heat stress revealed that gene namely HSP101C was up-regulated in Aegilops speltoides acc. Pau3583 by > fourfold in comparison to Triticum aestivum cv. PBW343 under heat stress signifies that it plays a role in conferring heat tolerance. Sequence comparison and phylogenetic analysis of AsHSP101C-Pau3583 with seven wheat homologs Triticum aestivum, Aegilops speltoides (TGAC), Triticum durum cv Cappelli, Triticum durum cv Strongfield, Triticum monococcum, Aegilops tauschii and Triticum urartu showed significant similarities with highly conserved coding regions and functional domains (AAA, AAA + 2, ClpB domains), suggesting the conserved function of HSP101C in different species. The illustration of the protein models of HSP101C in homologs provided information for the ATP-binding motifs within the nucleotide binding domains (NBD), specific for the chaperone activity. These findings are important and identified SNPs could be used for designing markers for ensuring the transfer of AsHSP101C-Pau3583 gene into hexaploid wheat and its role in heat tolerance.

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Availability of data and material

Gene sequence submitted to NCBI with accession number KT867225.

Abbreviations

HSP:

Heat shock protein

NBD:

Nucleotide binding domains

ClpB:

Caseinolytic protease domains

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Acknowledgements

(information that explains whether and by whom the research was supported) The authors gratefully acknowledge the financial support by Department of Biotechnology, Government of India under the grant BT/PR7851/AGR/2/376/2006.

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Conceptualization and methodology by KS. Material preparation, data collection, wet lab experiments and data analysis were performed by PJ. KS and PC conceived the study, provided genetic material, arranged funding and helped in manuscript writing. SK provided technical assistance: PJ, IY did the bioinformatics work. PJ wrote the manuscript; PJ, PS, IY, PK edit the manuscript; KS and PC review and did final editing. All authors commented on previous versions of the manuscript. All authors have critically read and approved final manuscript.

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Correspondence to Parveen Chhuneja.

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The authors declare no competing financial interest.

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Jakhu, P., Sharma, P., Yadav, I.S. et al. Cloning, expression analysis and In silico characterization of HSP101: a potential player conferring heat stress in Aegilops speltoides (Tausch) Gren. Physiol Mol Biol Plants 27, 1205–1218 (2021). https://doi.org/10.1007/s12298-021-01005-2

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  • DOI: https://doi.org/10.1007/s12298-021-01005-2

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