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- **********************************************
- * Heat shock hsp90 proteins family signature *
- **********************************************
-
- Prokaryotic and eukaryotic organisms respond to heat shock or other
- environmental stress by the induction of 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 90 Kd, known as the hsp90
- proteins. Proteins known to belong to this family are:
-
- - Escherichia coli heat shock protein c62.5 (gene htpG).
- - Yeast HSC82, and HSP82.
- - Drosophila hsp 82 (hsp 83).
- - Trypanosoma cruzi hsp 85.
- - Mammalian hsp 90-alpha (hsp 86) and hsp 90-beta (hsp 84).
- - Chicken hsp 90.
- - Plants Hsp82 or Hsp83.
- - The endoplasmic reticulum protein 'endoplasmin' (also known as Erp99 in
- mouse, GRP94 in hamster, and hsp 108 in chicken).
-
- The exact function of hsp90 proteins is not yet known. In higher eukaryotes,
- hsp90 has been found associated with steroid hormone receptors, with tyrosine
- kinase oncogene products of several retroviruses, with eIF2alpha kinase, and
- with actin and tubulin. Hsp90 are probable chaperonins that possess ATPase
- activity [2,3].
-
- As a signature pattern for the hsp90 family of proteins, we have selected a
- perfectly conserved hexapeptide found in the N-terminal part of these
- proteins.
-
- -Consensus pattern: N-K-[DE]-I-F-L
- -Sequences known to belong to this class detected by the pattern: ALL.
- -Other sequence(s) detected in SWISS-PROT: NONE.
- -Last update: June 1994 / Pattern and text revised.
-
- [ 1] Lindquist S., Craig E.A.
- Annu. Rev. Genet. 22:631-677(1988).
- [ 2] Nadeau K., Das A., Walsh C.T.
- J. Biol. Chem. 268:1479-1487(1993).
- [ 3] Jakob U., Buchner J.
- Trends Biochem. Sci. 19:205-211(1994).
-