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- ******************************************************************
- * Glutamate / Leucine / Phenylalanine dehydrogenases active site *
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-
- - Glutamate dehydrogenases (EC 1.4.1.2, EC 1.4.1.3, and EC 1.4.1.4) (GluDH)
- are enzymes that catalyze the NAD- or NADP-dependent reversible deamination
- of glutamate into alpha-ketoglutarate [1,2]. GluDH isozymes are generally
- involved with either ammonia assimilation or glutamate catabolism.
- - Leucine dehydrogenase (EC 1.4.1.9) (LeuDH) is a NAD-dependent enzyme that
- catalyzes the reversible deamination of leucine and several other aliphatic
- amino acids to their keto analogues [3].
- - Phenylalanine dehydrogenase (EC 1.4.1.20) (PheDH) is a NAD-dependent enzyme
- that catalyzes the reversible deamidation of L-phenylalanine into phenyl-
- pyruvate [4].
-
- These dehydrogenases are structurally and functionally related. A conserved
- lysine residue located in a glycine-rich region has been implicated in the
- catalytic mechanism. The conservation of the region around this residue allows
- the derivation of a signature pattern for such type of enzymes.
-
- -Consensus pattern: [LIV]-x(2)-G-G-[SAG]-K-x-[GV]-x(3)-[DNS]-[PL]
- [K 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.
-
- -Note: all known sequences from this family have Pro in the last position of
- the pattern with the exception of yeast GluDH which as Leu.
-
- -Last update: October 1993 / Pattern and text revised.
-
- [ 1] Britton K.L., Baker P.J., Rice D.W., Stillman T.J.
- Eur. J. Biochem. 209:851-859(1992).
- [ 2] Benachenhou-Lahfa N., Forterre P., Labedan B.
- J. Mol. Evol. 36:335-346(1993).
- [ 3] Nagata S., Tanizawa K., Esaki N., Sakamoto Y., Ohshima T., Tanaka H.,
- Soda K.
- Biochemistry 27:9056-9062(1988).
- [ 4] Takada H., Yoshimura T., Ohshima T., Esaki N., Soda K.
- J. Biochem. 109:371-376(1991).
-