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- ****************
- * Apple domain *
- ****************
-
- Plasma kallikrein (EC 3.4.21.34) and coagulation factor XI (EC 3.4.21.27) are
- two related plasma serine proteases activated by factor XIIA and which share
- the same domain topology: an N-terminal region that contains four tandem
- repeats of about 90 amino acids and a C-terminal catalytic domain.
-
- The 90 amino-acid repeated domain contains 6 conserved cysteines. It has been
- shown [1,2] that three disulfide bonds link the first and sixth, second and
- fifth, and third and fourth cysteines. The domain can be drawn in the shape of
- an apple (see below) and has been accordingly called the 'apple domain'.
-
- x x x x x x
- x C---C x
- x x x x
- x Cx x x x
- x | x x x Schematic representation of an
- x Cx x x x apple domain.
- x x x x
- x x x x
- x x x x x
- x x
- x x x x
- C---C
- .....x x.....
-
- Apart from the cysteines, there are a number of other conserved positions in
- the apple domain. We have developed a pattern, that spans the complete domain,
- and which includes these conserved positions.
-
- -Consensus pattern: C-x(3)-[LIVMFY]-x(5)-[LIVMFY]-x(3)-[DENQ]-[LIVMFY]-x(10)-
- C-x(3)-C-T-x(4)-C-x-[LIVMFY]-F-x-[FY]-x(13,14)-C-x-
- [LIVMFY]-[RK]-x-[ST]-x(14,15)-S-G-x-[ST]-[LIVMFY]-x(2)-C
- -Sequences known to belong to this class detected by the pattern: ALL.
- -Other sequence(s) detected in SWISS-PROT: NONE.
- -Last update: June 1992 / Pattern and text revised.
-
- [ 1] McMullen B.A., Fujikawa K., Davie E.W.
- Biochemistry 30:2050-2056(1991).
- [ 2] McMullen B.A., Fujikawa K., Davie E.W.
- Biochemistry 30:2056-2060(1991).
-