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Crystal Structure of Dephospho-Coenzyme A Kinase from Haemophilus influenzae

Journal of Structural Biology, ISSN: 1047-8477, Vol: 136, Issue: 2, Page: 119-125
2001
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Dephospho-coenzymeA kinase catalyzes the final step in CoA biosynthesis, the phosphorylation of the 3′-hydroxyl group of ribose using ATP as a phosphate donor. The protein from Haemophilus influenzae was cloned and expressed, and its crystal structure was determined at 2.0-Å resolution in complex with ATP. The protein molecule consists of three domains: the canonical nucleotide-binding domain with a five-stranded parallel β-sheet, the substrate-binding α-helical domain, and the lid domain formed by a pair of α-helices. The overall topology of the protein resembles the structures of nucleotide kinases. ATP binds in the P-loop in a manner observed in other kinases. The CoA-binding site is located at the interface of all three domains. The double-pocket structure of the substrate-binding site is unusual for nucleotide kinases. Amino acid residues implicated in substrate binding and catalysis have been identified. The structure analysis suggests large domain movements during the catalytic cycle.

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