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- ***********************************************************
- * Bowman-Birk serine protease inhibitors family signature *
- ***********************************************************
-
- The Bowman-Birk inhibitor family [1] is one of the numerous families of serine
- proteinase inhibitors. As it can be seen in the schematic representation, they
- have a duplicated structure and generally possess two distinct inhibitory
- sites:
-
- +------------------------------------------------+
- | +-----+ +-------+ +-----+ |
- | | | | | | | |
- xxCCxxCxxCxx#xxCxxCxxxxCxxxCxxxCxxxxCxx#xxCxxCxxCxxCxx
- | | |********|**** | |
- | | | | | |
- +--|-----------+ +-----------------+ |
- +-----------------------------------------+
-
- <-----------------70 residues-------------------->
-
- 'C': conserved cysteine involved in a disulfide bond.
- '#': active site residue.
- '*': position of the pattern.
-
- These inhibitors are found in the seeds of all leguminous plants as well as in
- cereal grains. In cereals they exist in two forms, one of which is a
- duplication of the basic structure shown above [2]. The pattern we developed
- to pick up sequences belonging to this family of inhibitors is in the central
- part of the domain and includes four cysteines.
-
- -Consensus pattern: C-x(5,6)-[DENQKRHSTA]-C-[PASTDH]-[PASTDK]-[ASTDV]-C-
- [NDKS]-[DEKRHSTA]-C
- [The four C's are involved in disulfide bonds]
- -Sequences known to belong to this class detected by the pattern: ALL.
- -Other sequence(s) detected in SWISS-PROT: NONE.
-
- -Note: this pattern can be found twice in some duplicated cereal inhibitors.
-
- -Last update: June 1994 / Pattern and text revised.
-
- [ 1] Laskowski M., Kato I.
- Annu. Rev. Biochem. 49:593-626(1980).
- [ 2] Tashiro M., Hashino K., Shiozaki M., Ibuki F., Maki Z.
- J. Biochem. 102:297-306(1987).
-