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- ****************************
- * Barwin domain signatures *
- ****************************
-
- Barwin [1] is a barley seed protein of 125 residues that binds weakly a chitin
- analog. It contains six cysteines involved in disulfide bonds, as shown in the
- following schematic representation.
-
- +---------------+
- | ***** | ****
- xxxxxxxxxxxxxxxCxxxxxxxxxxCxxxxCxCxxxxxxxxCxxxxxxxxxxxxxxxxxxCx
- | | | |
- +---------------+ +---------------------------+
-
- 'C': conserved cysteine involved in a disulfide bond.
- '*': position of the patterns.
-
- Barwin is closely related to the following proteins:
-
- - Hevein, a wound-induced protein found in the latex of rubber trees.
- - Win1 and win2, two wound-induced proteins from potato.
- - Pathogenesis-related protein 4 from tobacco.
-
- Hevein and the win1/2 proteins consist of an N-terminal chitin-binding domain
- followed by a barwin-like C-terminal domain. Barwin and its related proteins
- could be involved in a defense mechanism in plants. As signature patterns, we
- selected two highly conserved regions that contain some of the cysteines.
-
- -Consensus pattern: C-G-[KR]-C-L-x-V-T-N
- [The two 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.
-
- -Consensus pattern: V-N-Y-[EQ]-F-V-[DN]-C
- [C is involved in a disulfide bond]
- -Sequences known to belong to this class detected by the pattern: ALL.
- -Other sequence(s) detected in SWISS-PROT: NONE.
-
- -Last update: October 1993 / Patterns and text revised.
-
- [ 1] Svensson B., Svendsen I., Hojrup P., Roepstorff P., Ludvigsen S.,
- Poulsen F.M.
- Biochemistry 31:8767-8770(1992).
-