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Heat shock proteins (HSPs) are a family of proteins produced by cells in response to exposure to stressful conditions. They were first described in relation to heat shock, [1] but are now known to also be expressed during other stresses including exposure to cold, [2] UV light [3] and during wound healing or tissue remodeling. [4]
Heat shock proteins are also believed to play a role in the presentation of pieces of proteins (or peptides) on the cell surface to help the immune system recognize diseased cells. [22] The major HSPs involved in the HSR include HSP70, HSP90, and HSP60. [5] Chaperones include the HSP70s and HSP90s while HSP60s are considered to be chaperonins. [17]
Chaperonins are characterized by their barrel-shaped structure with binding sites for client proteins inside the barrels. The human HSP90 group consists of 5 members according to the HGNC: [17] [18] HSP90AA1 (heat shock protein 90 kDa alpha, class A, member 1) HSP90AA3P (heat shock protein 90 alpha family class A member 3, pseudogene)
Hsp90 (heat shock protein 90) is a chaperone protein that assists other proteins to fold properly, stabilizes proteins against heat stress, and aids in protein degradation. It also stabilizes a number of proteins required for tumor growth, which is why Hsp90 inhibitors are investigated as anti-cancer drugs.
By temporarily binding to hydrophobic residues exposed by stress, Hsp70 prevents these partially denatured proteins from aggregating, and inhibits them from refolding. Low ATP is characteristic of heat shock and sustained binding is seen as aggregation suppression, while recovery from heat shock involves substrate binding and nucleotide cycling.
Download as PDF; Printable version; ... Heat shock protein 105 kDa is a protein that in humans is encoded by the HSPH1 gene. [5] [6] [7]
3320 15519 Ensembl ENSG00000080824 ENSMUSG00000021270 UniProt P07900 P07901 RefSeq (mRNA) NM_001017963 NM_005348 NM_010480 RefSeq (protein) NP_001017963 NP_005339 NP_034610 Location (UCSC) Chr 14: 102.08 – 102.14 Mb Chr 12: 110.66 – 110.67 Mb PubMed search Wikidata View/Edit Human View/Edit Mouse Heat shock protein HSP 90-alpha is a protein that in humans is encoded by the HSP90AA1 gene ...
Hsp20, like all heat shock proteins, is in abundance when cells are under stressed conditions. [4] Hsp20 is known to be expressed in many human tissues, including the brain and heart. [ 5 ] Hsp20 has been studied extensively in cardiac myocytes and is known to act as a chaperon protein, binding to protein kinase 1 (PDK1) and allowing its ...