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pyridoxal-phosphate dependent enzyme
Members of this family are all pyridoxal-phosphate dependent enzymes. This family includes: serine dehydratase EC:4.2.1.13 P20132, threonine dehydratase EC:4.2.1.16 Swiss:P04968, tryptophan synthase beta chain EC:4.2.1.20 Swiss:P00932, threonine synthase EC:4.2.99.2 Swiss:P04990, cysteine synthase EC:4.2.99.8 P11096, cystathionine beta-synthase EC:4.2.1.22 Swiss:P35520, 1-aminocyclopropane-1-carboxylate deaminase EC:4.1.99.4 Swiss:P76316. (from Pfam)
threonine ammonia-lyase
PLP-dependent threonine ammonia-lyase catalyzes the first deamination step in the degradation of threonine
A form of threonine dehydratase with two copies of the C-terminal domain Pfam:PF00585 is described by TIGR01124. This model describes a phylogenetically distinct form with a single copy of PF00585. This form branches with the catabolic threonine dehydratase of E. coli; many members are designated as catabolic for this reason. However, the catabolic form lacks any PF00585 domain. Many members of this model are found in species with other Ile biosynthetic enzymes.
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