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- W4289520974 abstract "Abstract Heat shock proteins (HSPs) and heat stress factors (HSFs) control the plant heat stress response to a large extent. HSP101 plays a decisive role in development of plant heat tolerance. We have previously shown that rice ( Oryza sativa ) cells contain 25 HSFs and among these, HSFA6a most predominantly binds to the HSP101 promoter and controls its transcript expression. This study shows that mitogen‐activated protein kinases (MAPKs), specifically MPK3, MPK4, and MPK6 phosphorylate HSFA6a. HSFA6a showed physical interaction with MPK3/MPK4, specifically in the nucleus and this interaction involved the C‐terminal end of HSFA6a. Four serine residues at positions Ser136, Ser141, Ser264, and Ser356 of HSFA6a are the putative sites of MAPK phosphorylation: we generated phospho‐mutant of HSFA6a by changing the serine residues to alanine either individually or all four together. The Hsp101 promoter binding potential of Ser136 mutant was enhanced while it declined for the other three phospho‐mutant HSFA6a forms. HSFA6a mutant lacking all the above four Ser residues exhibited reduced DNA binding and transactivation potential. We implicate the role of phosphorylation in the regulation of HSFA6a activity." @default.
- W4289520974 created "2022-08-03" @default.
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- W4289520974 date "2022-07-01" @default.
- W4289520974 modified "2023-10-11" @default.
- W4289520974 title "Transcriptional regulation of rice <scp> <i>HSP101</i> </scp> promoter: Mitogen‐activated protein kinase‐mediated <scp>HSFA6a</scp> phosphorylation affects its stability and transactivation" @default.
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- W4289520974 doi "https://doi.org/10.1111/ppl.13754" @default.
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