home *** CD-ROM | disk | FTP | other *** search
- ****************************************
- * Histidinol dehydrogenase active site *
- ****************************************
-
- Histidinol dehydrogenase (EC 1.1.1.23) (HDH) catalyzes the terminal step in
- the biosynthesis of histidine in bacteria, fungi, and plants, the four-
- electron oxidation of L-histidinol to histidine.
-
- In bacteria HDH is a single chain polypeptide; in fungi it is the C-terminal
- domain of a multifunctional enzyme which catalyzes three different steps of
- histidine biosynthesis; and in plants it is expressed as nuclear encoded
- protein precursor which is exported to the chloroplast.
-
- In Salmonella typhimurium a cysteine has been shown [1] to be important for
- the catalytic activity of the enzyme, this cysteine is conserved in all known
- HDH [2]. We have used this region as a signature pattern.
-
- -Consensus pattern: V-E-x(3)-G-V-x-C-x(4)-R-x(4)-V-G-x-Y
- [C is the active site residue]
- -Sequences known to belong to this class detected by the pattern: ALL.
- -Other sequence(s) detected in SWISS-PROT: NONE.
- -Last update: June 1992 / First entry.
-
- [ 1] Grubmeyer C.T., Gray W.R.
- Biochemistry 25:4778-4784(1986).
- [ 2] Nagai A., Ward E., Beck J., Tada S., Chang J.-Y., Scheidegger A.,
- Ryals J.
- Proc. Natl. Acad. Sci. U.S.A. 88:4133-4137(1991).
-