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The HSP90-SGT1-RAR1 molecular chaperone complex: A core modulator in plant immunity

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Abstract

The HSP90 (heat shock protein 90), SGT1 (suppressor of G-two allele ofSkp1), and RAR1 (required forMla12 resistance) proteins in plants form a molecular chaperone complex which is involved in diverse biological signaling including development and disease resistance. The three components of this complex interact via specific protein binding motifs and recruit client proteins to initiate a specific signaling cascade in response to cellular or environmental cues. Although the functions of this chaperone complex during development/growth have not been well characterized, the HSP90 chaperone and SGT1 and RAR1 co-chaperones have been demonstrated to be essential signaling components of plant immune responses. These three proteins also play important roles in activation of the mammalian Nod genes, which possess a structurally conserved plant resistance (R) protein motif, NB-LRR (nucleotide binding site-leucine rich repeat). In this review, we summarize the structures and functions of these molecular chaperones, and discuss their putative modes of action in plant immune responses.

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Authors and Affiliations

  1. Department of Plant Pathology, University of California, 95616, Davis, CA, USA

    Young-Su Seo & Pamela Ronald

  2. Plant Metabolism Research Center & Graduate School of Biotechnology, Kyung Hee University, 446-701, Yongin, Korea

    Sang-Kyu Lee, Min-Young Song, Tae-Ryong Hahn & Jong-Seong Jeon

  3. IRRI-KOREA Office (IKO), National Institute of Crop Science, Rural Development Administration, 441-857, Suwon, Korea

    Jung-Pil Suh

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  1. Young-Su Seo
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Seo, YS., Lee, SK., Song, MY. et al. The HSP90-SGT1-RAR1 molecular chaperone complex: A core modulator in plant immunity. J. Plant Biol. 51, 1–10 (2008). https://doi.org/10.1007/BF03030734

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