A cystathionine beta‐synthase domain containing protein, OsCBSCBS4, interacts with OsSnRK1A and OsPKG and functions in abiotic stress tolerance in rice

胱硫醚β合酶 非生物胁迫 非生物成分 ATP合酶 生物 化学 生物化学 基因 生态学 半胱氨酸
作者
Surabhi Tomar,Ashish Subba,Yajnaseni Chatterjee,Nitin Kumar Singhal,Ashwani Pareek,Sneh L. Singla‐Pareek
出处
期刊:Plant Cell and Environment [Wiley]
标识
DOI:10.1111/pce.15061
摘要

Abstract The Cystathionine‐β‐Synthase (CBS) domain‐containing proteins (CDCPs) constitute a functionally diverse protein superfamily, sharing an evolutionary conserved CBS domain either in pair or quad. Rice genome ( Oryza sativa subsp. indica ) encodes 42 CDCPs; their functions remain largely unexplored. This study examines OsCBSCBS4, a quadruple CBS domain containing protein towards its role in regulating the abiotic stress tolerance in rice. Gene expression analyses revealed upregulation of OsCBSCBS4 in response to diverse abiotic stresses. Further, the cytoplasm‐localised OsCBSCBS4 showed interaction with two different kinases, a cytoplasmic localised cGMP‐dependant protein kinase (OsPKG) and the nucleo‐cytoplasmic catalytic subunit of sucrose‐nonfermentation 1‐related protein kinase 1 (OsSnRK1A). The interaction with the latter assisted in trafficking of OsCBSCBS4 to the nucleus as well. Overexpression of OsCBSCBS4 in rice resulted in enhanced tolerance to drought and salinity stress, via maintaining better physiological parameters and antioxidant activity. Additionally, OsCBSCBS4‐overexpressing rice plants exhibited reduced yield penalty under stress conditions. The in silico docking and in vitro binding analyses of OsCBSCBS4 with ATP suggest its involvement in cellular energy balance. Overall, this study provides novel insight into the unexplored functions of OsCBSCBS4 and demonstrates it as a new promising target for augmenting crop resilience.
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