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- ********************************
- * Chaperonins TCP-1 signatures *
- ********************************
-
- The TCP-1 protein [1,2] (Tailless Complex Polypeptide 1) was first identified
- in mice where it is especially abundant in testis but present in all cell
- types. It has since been found and characterized in many other mammalian
- species, in Drosophila and in yeast. TCP-1 is a highly conserved protein of
- about 60 Kd (556 to 560 residues) which participates in a hetero-oligomeric
- 900 Kd double-torus shaped particle [3] with 6 to 8 other different subunits.
- These subunits, the chaperonin containing TCP-1 (CCT) subunit beta, gamma,
- delta, epsilon, zeta and eta are evolutionary related to TCP-1 itself [4]. The
- CCT is known to act as a molecular chaperone for tubulin, actin and probably
- some other proteins.
-
- The CCT subunits are highly related to TF55 [5], a molecular chaperone
- isolated from the archaebacterium Sulfolobus shibatae. TF55 has ATPase
- activity, is known to bind unfolded polypeptides and forms an homo-oligomeric
- complex of two stacked nine-membered rings.
-
- The TCP-1 family of proteins are weakly, but significantly [6], related to the
- cpn60/groEL chaperonin family.
-
- As signature patterns of this family of chaperonins, we chose three conserved
- regions located in the N-terminal domain.
-
- -Consensus pattern: [RK]-[ST]-x-[LFY]-G-P-x-[GS]-x-x-K-[LIVM]
- -Sequence known to belong to this class detected by the pattern: ALL
- -Other sequence(s) detected in SWISS-PROT: NONE.
-
- -Consensus pattern: [LIVM]-[TS]-[NK]-D-G-[AN]-[TAV]-[LIVM]-L
- -Sequence known to belong to this class detected by the pattern: ALL
- -Other sequence(s) detected in SWISS-PROT: NONE.
-
- -Consensus pattern: Q-[DE]-x-x-[LIVTA]-[GA]-D-G-T
- -Sequence known to belong to this class detected by the pattern: ALL
- -Other sequence(s) detected in SWISS-PROT: yeast hypothetical protein YKL059c
-
- -Expert(s) to contact by email: Willison K.R.
- willison@icr.ac.uk
-
- -Last update: June 1994 / Patterns and text revised.
-
- [ 1] Ellis J.
- Nature 358:191-192(1992).
- [ 2] Nelson R.J., Craig E.A.
- Curr. Biol. 2:487-489(1992).
- [ 3] Lewis V.A., Hynes G.M., Zheng D., Saibil H., Willison K.R.
- Nature 358:249-252(1992).
- [ 4] Kubota H., Hynes G., Carne A., Ashworth A., Willison K.R.
- Curr. Biol. 4:89-99(1994)
- [ 5] Trent J.D., Nimmesgern E., Wall J.S., Hartl F.U., Horwich A.L.
- Nature 354:490-493(1991).
- [ 6] Hemmingsen S.M.
- Nature 357:650-650(1992).
-