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- * Pyridine nucleotide-disulphide oxidoreductases class-II active site *
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-
- The pyridine nucleotide-disulphide oxidoreductases are FAD flavoproteins which
- contains a pair of redox-active cysteines involved in the transfer of reducing
- equivalents from the FAD cofactor to the substrate. On the basis of sequence
- and structural similarities [1] these enzymes can be classified into two
- categories. The second category groups together the following enzymes:
-
- - Escherichia coli thioredoxin reductase (EC 1.6.4.5) (gene trxB) [2].
- - Salmonella typhimurium alkyl hydroperoxide reductase protein F52a (gene
- aphF) [3], an enzyme that serves to protect the cell against damage to DNA
- by alkyl hydroperoxides.
- - NADH dehydrogenase (EC 1.6.99.3) from Bacillus strain YN-1 (gene ndh) [4].
- - A probable oxidoreductase which is encoded in the Clostridium pasteurianum
- rubredoxin operon [5].
-
- The sequence around the two cysteines involved in the redox-active disulfide
- bond is conserved and can be used as a signature pattern.
-
- -Consensus pattern: C-x(2)-C-D-G-x(2)-[FY]-x(4)-[LIVM]-x-[LIVM](2)-G(3)-N
- [The two C's form the active site disulfide bond]
- -Sequences known to belong to this class detected by the pattern: ALL.
- -Other sequence(s) detected in SWISS-PROT: NONE.
- -Last update: December 1992 / Text revised.
-
- [ 1] Kurlyan J., Krishna T.S.R., Wong L., Guenther B., Pahler A.,
- Williams C.H. Jr., Model P.
- Nature 352:172-174(1991).
- [ 2] Russel M., Model P.
- J. Biol. Chem. 263:9015-9019(1988).
- [ 3] Tartaglia L.A., Storz G., Brodsky M.H., Lai A., Ames B.N.
- J. Biol. Chem. 265:10535-10540(1990).
- [ 4] Xu X., Koyama N., Cui M., Yamagishi A., Nosoh Y., Oshima T.
- J. Biochem. 109:678-683(1991).
- [ 5] Mathieu I., Meyer J., Moulis J.M.
- Biochem. J. 285:255-262(1992).
-