home *** CD-ROM | disk | FTP | other *** search
- *********************************************************************
- * Bacterial ring hydroxylating dioxygenases alpha-subunit signature *
- *********************************************************************
-
- Bacterial ring hydroxylating dioxygenases are multicomponent enzymatic
- complexes composed of a hydroxylase component and an electron transfer
- component. The hydroxylase component is itself composed of two subunits: an
- alpha-subunit of about 50 Kd, and a beta-subunit of about 20 Kd. The electron
- transfer component is either composed of two subunits: a ferredoxin and a
- ferredoxin reductase or by a single bifunctional ferredoxin/reductase subunit.
-
- The alpha-subunit of hydroxylase components are evolutionary related [1]. The
- currently known members of this family are listed below.
-
- - Benzene 1,2-dioxygenase (EC 1.14.12.3) (gene bnzA) from Pseudomonas putida.
- - Benzoate 1,2-dioxygenase (EC 1.14.12.10) (gene benA) from Acinetobacter
- calcoaceticus.
- - Naphthalene 1,2-dioxygenase (EC 1.14.12.12) (gene ndoC) from Pseudomonas
- putida.
- - Toluate 1,2-dioxygenase (EC 1.14.12.-) (gene xylX) from Pseudomonas putida.
- - Toluene 1,2-dioxygenase (EC 1.14.12.11) (gene todC1) from Pseudomonas
- putida.
-
- The alpha-subunit of the hydroxylase components bind both a 2Fe-2S type iron-
- sulfur center and an iron atom. There is, in the N-terminal section of these
- proteins, a conserved region of 24 residues which contains two cysteines and
- two histidines which could be involved in the binding of the iron-sulfur
- center. We have used this region has a signature pattern.
-
- -Consensus pattern: C-x-H-R-G-x(8)-G-N-x(5)-C-x-[FY]-H
- [The two C's and the two H's are putative 2Fe2S ligands]
- -Sequences known to belong to this class detected by the pattern: ALL.
- -Other sequence(s) detected in SWISS-PROT: NONE.
-
- -Expert(s) to contact by email: Harayama S.
- sharayam@ddbj.nig.ac.jp
-
- -Last update: October 1993 / Text revised.
-
- [ 1] Neidle E.L., Hartnett C., Ornston N.L., Bairoch A., Rekik M., Harayama S.
- J. Bacteriol. 173:5385-5395(1991).
-