Biology:Hsp20
| Hsp20/alpha crystallin family | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| Identifiers | |||||||||||
| Symbol | HSP20 | ||||||||||
| Pfam | PF00011 | ||||||||||
| InterPro | IPR002068 | ||||||||||
| PROSITE | PDOC00791 | ||||||||||
| SCOP2 | 1shs / SCOPe / SUPFAM | ||||||||||
| CDD | cd06464 | ||||||||||
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The heat shock protein Hsp20 family, also known as small heat shock proteins (sHSPs), is a family of heat shock proteins.
Prokaryotic and eukaryotic organisms respond to heat shock or other environmental stress by inducing the synthesis of proteins collectively known as heat-shock proteins (hsp).[1] Amongst them is a family of proteins with an average molecular weight of 20 kDa, known as the hsp20 proteins.[2] These seem to act as protein chaperones that can protect other proteins against heat-induced denaturation and aggregation. Hsp20 proteins seem to form large heterooligomeric aggregates. Structurally, this family is characterised by the presence of a conserved C-terminal domain, alpha-crystallin domain, of about 100 residues. Recently, small heat shock proteins (sHSPs) were found in marine viruses (cyanophages).[3]
Function and regulation
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 nuclear transport.[6] In addition, the phosphorylation of hsp20 has been shown to effect the structure of cells cytoskeletons.[7] Due to hsp20 commonly forming dimers with itself when heated, its function of chaperoning can be greatly affected.[8]
Human small heat shock proteins
References
- ↑ "The heat-shock proteins". Annu. Rev. Genet. 22: 631–677. 1988. doi:10.1146/annurev.ge.22.120188.003215. PMID 2853609.
- ↑ "Structure and modifications of the junior chaperone alpha-crystallin. From lens transparency to molecular pathology". Eur. J. Biochem. 225 (1): 1–9. 1994. doi:10.1111/j.1432-1033.1994.00001.x. PMID 7925426.
- ↑ "Analysis and phylogeny of small heat shock proteins from marine viruses and their cyanobacteria host.". PLOS ONE 8 (11). 2013. doi:10.1371/journal.pone.0081207. PMID 24265841. Bibcode: 2013PLoSO...881207M.
- ↑ LI, D.C.; Lan, Fan; Chen, Dian-Fu; Yang, Wei-Jun; Lu, Bo (2012). "Thermotolerance and molecular chaperone function of the small heat shock protein HSP20 from hyperthermophilic archaeon, Sulfolobus solfataricus P2". Cell Stress & Chaperones 17 (1): 103–8. doi:10.1007/s12192-011-0289-z. PMID 21853411.
- ↑ G.C, Fan; G, Chu; EG, Kranies (May 2005). "Hsp20 and its cardioprotection". Trends Cardiovasc. Med. 15 (4): 138–41. doi:10.1016/j.tcm.2005.05.004. PMID 16099377.
- ↑ Yan Sin, Yuan; Currie, Susan; P Martin, Lauren; Wills, Tamara; S Baillie, George (2015). "Small heat shock protein 20 (Hsp20) facilitates nuclear import of protein kinase D 1 (PKD1) during cardiac hypertrophy". Cell Commun Signal 13: 16. doi:10.1186/s12964-015-0094-x. PMID 25889640.
- ↑ M. Dreiza, Catherine; M. Brophy, Colleen; Komalavilas, Padmini; J. Furnish, Elizabeth; Joshi, Lokesh; A. Pallero, Manuel; E. Murphy-Ullrich, Joanne; von Rechenberg, Moritz et al. (2005). "Transducible heat shock protein 20 (HSP20) phosphopeptide alters cytoskeletal dynamics". The FASEB Journal 19 (2): 261–263. doi:10.1096/fj.04-2911fje. PMID 15598710.
- ↑ van Montfort, RL; Basha, E; Friedrich, KL; Slingsby, C; Vierling, E (2001). "Crystal structure and assembly of a eukaryotic small heat shock protein". Nature Structural Biology 8 (12): 1025–1030. doi:10.1038/nsb722. PMID 11702068.
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