home *** CD-ROM | disk | FTP | other *** search
- **************************************************
- * Orn/DAP/Arg decarboxylases family 2 signatures *
- **************************************************
-
- Pyridoxal-dependent decarboxylases acting on ornithine, lysine, arginine and
- related substrates can be classified into two different families on the basis
- of sequence similarities [1,2]. The second family consists of:
-
- - Eukaryotic ornithine decarboxylase (EC 4.1.1.17) (ODC). ODC catalyzes the
- transformation of ornithine into putrescine.
- - Prokaryotic diaminopimelic acid decarboxylase (EC 4.1.1.20) (DAPDC). DAPDC
- catalyzes the conversion of diaminopimelic acid into lysine; the last step
- in the biosynthesis of lysine.
- - Pseudomonas syringae pv. tabaci protein tabA. tabA is probably involved in
- the biosynthesis of tabtoxin and is highly similar to DAPDC.
- - Bacterial and plant biosynthetic arginine decarboxylase (EC 4.1.1.19)
- (ADC). ADC catalyzes the transformation of arginine into agmatine, the
- first step in the biosynthesis of putrescine from arginine.
-
- The above proteins, while most probably evolutionary related, do not share
- extensive regions of sequence similarities. We selected two of the conserved
- regions as signature patterns. The first pattern contains a conserved lysine
- residue which is known, in mouse ODC [3], to be the site of attachment of the
- pyridoxal-phosphate group. The second pattern contains a stretch of three
- consecutive glycine residues and has been proposed to be part of a substrate-
- binding region [4].
-
- -Consensus pattern: [FY]-[PA]-x-K-[SACV]-x(5)-[LIVM]-[LIVMA]-x(2)-[LIVMA]-
- x(3)-G
- [K is the pyridoxal-P attachment site]
- -Sequences known to belong to this class detected by the pattern: ALL, except
- for hamster ODC.
- -Other sequence(s) detected in SWISS-PROT: NONE.
-
- -Consensus pattern: [LIVMSC]-x(2)-[LIVMF]-[DNS]-[LIVMCA]-G-G-G-[LIVMFY]-
- x(0,1)-[GSF]
- -Sequences known to belong to this class detected by the pattern: ALL.
- -Other sequence(s) detected in SWISS-PROT: 6.
-
- -Last update: October 1993 / First entry.
-
- [ 1] Bairoch A.
- Unpublished observations (1993).
- [ 2] Martin C., Cami B., Yeh P., Stragier P., Parsot C., Patte J.-C.
- Mol. Biol. Evol. 5:549-559(1988).
- [ 3] Poulin R., Lu L., Ackermann B., Bey P., Pegg A.E.
- J. Biol. Chem. 267:150-158(1992).
- [ 4] Moore R.C., Boyle S.M.
- J. Bacteriol. 172:4631-4640(1990).
-