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タイトル
和文: 
英文:Hierarchical Model for the Role of J-Domain Proteins in Distinct Cellular Functions 
著者
和文: Shinya Sugimoto, Kunitoshi Yamanaka, 丹羽達也, Yurika Terasawa, Yuki Kinjo, Yoshimitsu Mizunoe, Teru Ogura.  
英文: Shinya Sugimoto, Kunitoshi Yamanaka, Tatsuya Niwa, Yurika Terasawa, Yuki Kinjo, Yoshimitsu Mizunoe, Teru Ogura.  
言語 English 
掲載誌/書名
和文: 
英文:Journal of Molecular Biology 
巻, 号, ページ Volume 433    Issue 3   
出版年月 2021年2月 
出版者
和文: 
英文:Elsevier 
会議名称
和文: 
英文: 
開催地
和文: 
英文: 
公式リンク https://www.sciencedirect.com/science/article/pii/S0022283620306756?via%3Dihub
 
DOI https://doi.org/10.1016/j.jmb.2020.166750
アブストラクト In Escherichia coli, the major bacterial Hsp70 system consists of DnaK, three J-domain proteins (JDPs: DnaJ, CbpA, and DjlA), and nucleotide exchange factor GrpE. JDPs determine substrate specificity for the Hsp70 system; however, knowledge on their specific role in bacterial cellular functions is limited. In this study, we demonstrated the role of JDPs in bacterial survival during heat stress and the DnaK-regulated formation of curli-extracellular amyloid fibers involved in biofilm formation. Genetic analysis demonstrate that only DnaJ is essential for survival at high temperature. On the other hand, either DnaJ or CbpA, but not DjlA, is sufficient to activate DnaK in curli production. Additionally, several DnaK mutants with reduced activity are able to complement the loss of curli production in E. coli ΔdnaK, whereas they do not recover the growth defect of the mutant strain at high temperature. Biochemical analyses reveal that DnaJ and CbpA are involved in the expression of the master regulator CsgD through the solubilization of MlrA, a DNA-binding transcriptional activator for the csgD promoter. Furthermore, DnaJ and CbpA also keep CsgA in a translocation-competent state by preventing its aggregation in the cytoplasm. Our findings support a hierarchical model wherein the role of JDPs in the Hsp70 system differs according to individual cellular functions.

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