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Small heat shock proteins from extremophiles: a review

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Abstract

Many microorganisms from extreme environments have been well characterized, and increasing access to genomic sequence data has recently allowed the analysis of the protein families related to stress responses. Heat shock proteins appear to be ubiquitous in extremophiles. In this review, we focus on the family of small heat shock proteins (sHSPs) from extremophiles, which are α-crystallin homologues. Like the α-crystallin eye lens proteins, sHSPs act as molecular chaperones and prevent aggregation of denatured proteins under heat and desiccation stress. Many putative sHSP homologues have been identified in the genomic sequences of all classes of extremophiles. Current studies of shsp gene expression have revealed mechanisms of regulation and activity distinct from other known hsp gene regulation systems. Biochemical studies on sHSPs are limited to thermophilic and hyperthermophilic organisms, and the only two available crystal structures of sHSPs from Methanocaldococcus jannaschii, a hyperthermophilic archaeon and a mesophilic eukaryote, have contributed significantly to an understanding of the mechanisms of action of sHSPs, although many aspects remain unclear.

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  1. Center of Marine Biotechnology, University of Maryland Biotechnology Institute, 701 E. Pratt Street, Baltimore, MD 21202, USA

    Pongpan Laksanalamai & Frank T. Robb

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  1. Pongpan Laksanalamai
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  2. Frank T. Robb
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Correspondence to Frank T. Robb.

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Communicated by D.A. Cowan

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Laksanalamai, P., Robb, F.T. Small heat shock proteins from extremophiles: a review. Extremophiles 8, 1–11 (2004). https://doi.org/10.1007/s00792-003-0362-3

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