Respuesta :
A plant respond to severe heat stress by producing heat-shock proteins, which may protect the plant's proteins from denaturing.
Heat shock proteins (HSPs) are a family of proteins produced by cells in response to stressful conditions.
They were first described in the context of heat shock, but are now known to be expressed during cold, exposure to ultraviolet light, and other stresses, including wound healing or tissue remodelling.
Many members of this group perform chaperone functions, stabilizing new proteins to ensure proper folding or assisting in the refolding of proteins damaged by cellular stress.
This increase in expression is transcriptionally regulated. Dramatic upregulation of heat shock proteins is a key component of the heat shock response and is primarily induced by heat shock factor (HSF).
HSPs are found in virtually all organisms, from bacteria to humans.
The heat shock proteins are named according to their molecular weight. For example, Hsp60, Hsp70, and Hsp90 (the most commonly studied HSPs) refer to a family of heat shock proteins of the order of 60, 70, and 90 kilodaltons, respectively.
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