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J-like protein family of Arabidopsis thaliana: the enigmatic cousins of J-domain proteins

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J-like proteins (JLPs) are emerging as ancillaries to the cellular chaperone network. They modulate functions of Hsp70:J-domain protein (JDP) systems in novel ways thereby having key roles in diverse plant processes.

J-domain proteins (JDPs) form an obligate co-chaperone partnership with Hsp70s with their highly conserved J-domain to steer protein quality control processes in the cell. The HPD motif between helix II and helix III of the J-domain is crucial for JDP’s interaction with Hsp70s. According to the most recent classification, J-like proteins (JLPs) form an extended class of the JDP family possessing a degenerate J-domain with the HPD motif non-conservatively replaced by other amino acid residues and hence are not able to interact with Hsp70s. Considering this most updated and acceptable JLP classification, we identified 21 JLPs in Arabidopsis thaliana that share a structurally conserved J-like domain (JLD), but lack the HPD motif. Analysis of publicly available gene expression data as well as real-time quantitative PCR performed for a few selected JLPs implicated some of these proteins in growth, development and stress response. Here, we summarize the current state of knowledge on plant JLPs and their involvement in vital plant cellular/metabolic processes, including chloroplast division, mitochondrial protein import and flowering. Finally, we propose possible modes of action for these highly elusive proteins and other DnaJ-related proteins (DNAJRs) in regulating the Hsp70 chaperone network.

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Acknowledgements

We sincerely thank all the laboratory members for their valuable discussions on this manuscript. CT and AV thank the Department of Science and Technology (DST) INSPIRE fellowship for Ph.D. and Kishore Vaigyanik Protsahan Yojana (KVPY) scholarship for undergraduate study and, respectively.

Funding

This work was supported by the Science and Engineering Research Board (SERB-EMR/2015/001213) and Department of Biotechnology, Government of India (BT/PR12149/BRB/10/1348/2014), and intramural funds from IISER Bhopal to CS.

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CT, AKV, and CS conceived the idea; CT and DD performed the qRT-PCR experiments and analysed the data. AKV, CT, VZ, and AV performed the bioinformatics studies. CT, AKV, VZ, and CS wrote the manuscript.

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Correspondence to Chandan Sahi.

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Communicated by Wusheng Liu.

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Tamadaddi, C., Verma, A.K., Zambare, V. et al. J-like protein family of Arabidopsis thaliana: the enigmatic cousins of J-domain proteins. Plant Cell Rep 41, 1343–1355 (2022). https://doi.org/10.1007/s00299-022-02857-y

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