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- ******************************************************
- * Clathrin adaptor complexes medium chain signatures *
- ******************************************************
-
- Clathrin coated vesicles (CCV) mediate intracellular membrane traffic such as
- receptor mediated endocytosis. In addition to clathrin, the CCV are composed
- of a number of other components including oligomeric complexes which are known
- as adaptor or clathrin assembly proteins (AP) complexes [1]. The adaptor
- complexes are believed to interact with the cytoplasmic tails of membrane
- proteins, leading to their selection and concentration. In mammals two type of
- adaptor complexes are known: AP-1 which is associated with the Golgi complex
- and AP-2 which is associated with the plasma membrane. Both AP-1 and AP-2 are
- heterotetramers that consist of two large chains - the adaptins - (gamma and
- beta' in AP-1; alpha and beta in AP-2); a medium chain (AP47 in AP-1; AP50 in
- AP-2) and a small chain (AP19 in AP-1; AP17 in AP-2).
-
- The medium chains of AP-1 and AP-2 are evolutionary related proteins of about
- 50 Kd. Homologs of AP47 and AP50 have also been found in Caenorhabditis
- elegans (genes ap50 and unc-101) [2] and yeast (gene APM2 or YAP54) [3].
-
- As signature patterns, we selected two highly conserved regions from the
- central section of these proteins.
-
- -Consensus pattern: N-F-V-[LIV]-I-Y-E-L-L-D-E
- -Sequences known to belong to this class detected by the pattern: ALL.
- -Other sequence(s) detected in SWISS-PROT: NONE.
-
- -Consensus pattern: [ED]-D-x(2)-F-H-Q-C-V-[KR]-L-[ST]-[KR]-F-[DE]
- -Sequences known to belong to this class detected by the pattern: ALL.
- -Other sequence(s) detected in SWISS-PROT: NONE.
-
- -Last update: June 1994 / First entry.
-
- [ 1] Pearse B.M., Robinson M.S.
- Ann. Rev. Cell Biol. 6:151-171(1990).
- [ 2] Lee J., Jongeward G.D., Sternberg P.W.
- Genes Dev. 8:60-73(1994).
- [ 3] Nakayama Y., Goebl M., O'Brine G.B., Lemmon S., Pingchang C.E.,
- Kirchhausen T.
- Eur. J. Biochem. 202:569-574(1991).
-