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- ******************************
- * Vinculin family signatures *
- ******************************
-
- Vinculin [1] is a eukaryotic protein that seems to be involved in the
- attachment of the actin-based microfilaments to the plasma membrane. Vinculin
- is located at the cytoplasmic side of focal contacts or adhesion plaques.
- In addition to actin, vinculin interacts with other structural proteins such
- as talin and alpha-actinins.
-
- Vinculin is a large protein of 116 Kd (about a 1000 residues). Structurally
- the protein consists of an acidic N-terminal domain of about 90 Kd separated
- from a basic C-terminal domain of about 25 Kd by a proline-rich region of
- about 50 residues. The central part of the N-terminal domain consists of a
- variable number (3 in vertebrates, 2 in Caenorhabditis elegans) of repeats of
- a 110 amino acids domain.
-
- Catenins [2] are proteins that associate with the cytoplasmic domain of a
- variety of cadherins. The association of catenins to cadherins produces a
- complex which is linked to the actin filament network, and which seems to be
- of primary importance for cadherins cell-adhesion properties. Three different
- types of catenins seem to exist: alpha, beta, and gamma. Alpha-catenins are
- proteins of about 100 Kd which are evolutionary related to vinculin. In
- term of their structure the most significant differences are the absence, in
- alpha-catenin, of the repeated domain and of the proline-rich segment.
-
- We developed two signature patterns for this family of proteins. The first
- pattern is located in the N-terminal section of both vinculin and alpha-
- catenins and is part, in vinculin, of a domain that seems to be involved with
- the interaction with talin. The second pattern is based on a conserved region
- in the N-terminal part of the repeated domain of vinculin.
-
- -Consensus pattern: [KR]-x-[LIVMF]-x(3)-[LIVMA]-x(2)-[LIVM]-x(6)-R-Q-Q-E-L
- -Sequences known to belong to this class detected by the pattern: ALL.
- -Other sequence(s) detected in SWISS-PROT: NONE.
-
- -Consensus pattern: [LIVM]-x-[QA]-A-x(2)-W-[IL]-x-[DN]-P
- -Sequences known to belong to this class detected by the pattern: vinculins.
- -Other sequence(s) detected in SWISS-PROT: NONE.
-
- -Note: this pattern will pick up all copies of the repeated domain.
-
- -Last update: June 1994 / Patterns and text revised.
-
- [ 1] Otto J.J.
- Cell Motil. Cytoskeleton 16:1-6(1990).
- [ 2] Herrenknecht K., Ozawa M., Eckerskorn C., Lottspeich F., Lenter M.,
- Kemler R.
- Proc. Natl. Acad. Sci. U.S.A. 88:9156-9160(1991).
-