The small heat shock proteins in plants are members of an ancient family of heat induced proteins |
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Authors: | Elizabeth Vierling |
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Institution: | (1) Department of Biochemistry, University of Arizona, 85721 Tucson, AZ, USA |
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Abstract: | In response to high temperature stress, plants express numerous small heat shock proteins (sHSPs) belonging to at least five
related gene families. in vitro studies suggest sHSPs act as molecular chaperones to prevent irreversible heat denaturation of other proteins. The diversity
of sHSPs in plants is unique among eukaryotes and makes it of interest to understand the origins of these proteins. sHSP-related
proteins have now been identified in 13 prokaryotes, and in many of these prokaryotes the sHSPs are heat-regulated as seen
higher plants. The prokaryotic sHSPs were analyzed by pairwise and mutliple sequence alignments with each other and with plant
sHSPs. The higher plant class I cytosolic sHSPs are shown to be most similar to a subset of the prokaryotic sHSPs, including
HSP 16.6 from the cyanobacterium Synechocystis. Genetic studies in this model cyanobacterium may provide insight into sHSP function in vivo, and into potential roles of sHSPs in higher plant cells. |
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Keywords: | molecular chaperone thermotolerance prokaryotes Synechocystis evolution Pisum sativum |
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