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. 1995 Feb;4(2):268–274. doi: 10.1002/pro.5560040213

Divergent evolution of a beta/alpha-barrel subclass: detection of numerous phosphate-binding sites by motif search.

P Bork 1, J Gellerich 1, H Groth 1, R Hooft 1, F Martin 1
PMCID: PMC2143062  PMID: 7757015

Abstract

Study of the most conserved region in many beta/alpha-barrels, the phosphate-binding site, revealed a sequence motif in a few beta/alpha-barrels with known tertiary structure, namely glycolate oxidase (GOX), cytochrome b2 (Cyb2), tryptophan synthase alpha subunit (TrpA), and the indoleglycerolphosphate synthase (TrpC). Database searches identified this motif in numerous other enzyme families: (1) IMP dehydrogenase (IMPDH) and GMP reductase (GuaC); (2) phosphoribosylformimino-5-aminoimidazol carboxamide ribotide isomerase (HisA) and the cyclase-producing D-erythro-imidazole-glycerolphosphate (HisF) of the histidine biosynthetic pathway; (3) dihydroorotate dehydrogenase (PyrD); (4) glutamate synthase (GltB); (5) ThiE and ThiG involved in the biosynthesis of thiamine as well as related proteins; (6) an uncharacterized open reading frame from Erwinia herbicola; and (7) a glycerol uptake operon antiterminator regulatory protein (GlpP). Secondary structure predictions of the different families mentioned above revealed an alternating order of beta-strands and alpha-helices in agreement with a beta/alpha-barrel-like topology. The putative phosphate-binding site is always found near the C-terminus of the enzymes, which are all at least about 200 amino acids long. This is compatible with its assumed location between strand 7 and helix 8. The identification of a significant motif in functionally diverse enzymes suggests a divergent evolution of at least a considerable fraction of beta/alpha-barrels. In addition to the known accumulation of beta/alpha-barrels in the tryptophan biosynthetic pathway, we observe clusters of these enzymes in histidine biosynthesis, purine metabolism, and apparently also in thiamine biosynthesis. The substrates are mostly heterocyclic compounds.(ABSTRACT TRUNCATED AT 250 WORDS)

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Selected References

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