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- *********************************
- * Chaperonins clpA/B signatures *
- *********************************
-
- A number of ATP-binding proteins that are are thought to protect cells from
- extreme stress by controlling the aggregation of denaturation of vital
- cellular structures have been shown [1,2] to be evolutionary related. These
- proteins are listed below.
-
- - Escherichia coli clpA, which acts as the regulatory subunit of the ATP-
- dependent protease clp.
- - Rhodopseudomonas blastica clpA homolog.
- - Escherichia coli heat shock protein clpB.
- - Bacteroides nodosus clpB homolog.
- - Yeast heat shock protein 104 (gene HSP104), which is vital for tolerance to
- heat, ethanol and other stresses.
- - Neurospora heat shock protein hsp98.
- - Yeast mitochondrial heat shock protein 78 (gene HSP78) [3].
- - CD4A and CD4b, two highly related tomato proteins that seem to be located
- in the chloroplast.
- - Trypanosoma brucei protein clp.
-
- The size of these proteins range from 84 Kd (clpA) to slightly more than 100
- Kd (HSP104). They all share two conserved regions of about 200 amino acids
- that each contains an ATP-binding site. In addition to the ATP-binding A and
- B motifs there are many parts in these two domains that are also conserved. We
- have selected two of these regions as signature patterns. The first signature
- is located in the first domain, some ten residues to the C-terminal of the
- ATP-binding B motif. The second pattern is located in the second domain in
- between the ATP-binding A and B motifs.
-
- -Consensus pattern: D-A-[SGA]-N-[LIVM](2)-K-P-x-L-x(2)-G
- -Sequences known to belong to this class detected by the pattern: ALL.
- -Other sequence(s) detected in SWISS-PROT: NONE.
-
- -Consensus pattern: R-[LIVMFY]-D-x-S-E-[LIVMFY]-x-E-[KRQ]-x-[STA]-x-[STA]-
- [KR]-[LIVM]-x-G-[STA]
- -Sequences known to belong to this class detected by the pattern: ALL.
- -Other sequence(s) detected in SWISS-PROT: NONE.
-
- -Last update: June 1994 / Text revised.
-
- [ 1] Gottesman S., Squires C., Pichersky E., Carrington M., Hobbs M.,
- Mattick J.S., Dalrymple B., Kuramitsu H., Shiroza T., Foster T.,
- Clark W.P., Ross B., Squires C.L., Maurizi M.R.
- Proc. Natl. Acad. Sci. U.S.A. 87:3513-3517(1990).
- [ 2] Parsell D.A., Sanchez Y., Stitzel J.D., Lindquist S.
- Nature 353:270-273(1991).
- [ 3] Leonhardt S.A., Fearon K., Danese P.N., Mason T.L.
- Mol. Cell. Biol. 13:6304-6313(1993).
-