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. 1995 May;4(5):849–854. doi: 10.1002/pro.5560040504

Structural motifs for pyridoxal-5'-phosphate binding in decarboxylases: an analysis based on the crystal structure of the Lactobacillus 30a ornithine decarboxylase.

C Momany 1, R Ghosh 1, M L Hackert 1
PMCID: PMC2143112  PMID: 7663340

Abstract

Two of the five domains in the structure of the ornithine decarboxylase (OrnDC) from Lactobacillus 30a share similar structural folds around the pyridoxal-5'-phosphate (PLP)-binding pocket with the aspartate aminotransferases (AspATs). Sequence comparisons focusing on conserved residues of the aligned structures reveal that this structural motif is also present in a number of other PLP-dependent enzymes including the histidine, dopa, tryptophan, glutamate, and glycine decarboxylases as well as tryptophanase and serine-hydroxymethyl transferase. However, this motif is not present in eukaryotic OrnDCs, the diaminopimelate decarboxylases, nor the Escherichia coli or oat arginine decarboxylases. The identification and comparison of residues involved in defining the different classes are discussed.

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Selected References

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