home *** CD-ROM | disk | FTP | other *** search
- *******************************
- * Chaperonins cpn10 signature *
- *******************************
-
- Chaperonins [1,2] are proteins involved in the folding of proteins or the
- assembly of oligomeric protein complexes. They seem to assist other
- polypeptides in maintaining or assuming conformations which permit their
- correct assembly into oligomeric structures. They are found in abundance in
- prokaryotes, chloroplasts and mitochondria. Chaperonins form oligomeric
- complexes and are composed of two different types of subunits: a 60 Kd
- protein, known as cpn60 (groEL in bacteria) and a 10 Kd protein, known as
- cpn10 (groES in bacteria).
-
- The cpn10 protein binds to cpn60 in the presence of MgATP and suppresses the
- ATPase activity of the latter. Cpn10 is a protein of about 100 amino acid
- residues whose sequence is well conserved in bacteria, vertebrate mitochondria
- and plants chloroplast [3,4]. As a signature pattern for cpn10 we selected a
- region located in the N-terminal section of the protein.
-
- -Consensus pattern: [LIVMFY]-x-P-[LT]-x-[DN]-[KR]-[LIVMF](3)-[KREQ]-x(8,9)-
- [SG]-x-[LIVMF](3)
- -Sequences known to belong to this class detected by the pattern: ALL.
- -Other sequence(s) detected in SWISS-PROT: NONE.
-
- -Note: this pattern is found twice in the plant chloroplast protein which
- consist of the tandem repeat of a cpn10 domain.
-
- -Expert(s) to contact by email: Georgopoulos C.
- georgopo@cmu.unige.ch
-
- -Last update: June 1994 / Pattern and text revised.
-
- [ 1] Ellis R.J., van der Vies S.M.
- Annu. Rev. Biochem. 60:321-347(1991).
- [ 2] Zeilsta-Ryalls J., Fayet O., Georgopoulos C.
- Annu. Rev. Microbiol. 45:301-325(1991).
- [ 3] Hartman D.J., Hoogenraad N.J., Condron R., Hoj P.B.
- Proc. Natl. Acad. Sci. U.S.A. 89:3394-3398(1992).
- [ 4] Bertsch U., Soll J., Seetharam R., Viitanen P.V.
- Proc. Natl. Acad. Sci. U.S.A. 89:8696-8700(1992).
-