ArticleBiochemistry2012
Structural insights into the mechanism of four-coordinate Cob(II)alamin formation in the active site of the Salmonella enterica ATP:Co(I)rrinoid adenosyltransferase enzyme: critical role of residues Phe91 and Trp93.
Article in Biochemistry, 2012. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 15 papers.
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15 citing papers in PubMed, 29 citations in OpenAlex.
- His-Ala-Phe-Lys peptide fromFrontiers in microbiology · 2022Article
- VBmSystems · 2021Article
- Surprising Homolytic Gas Phase Co-C Bond Dissociation Energies of Organometallic Aryl-Cobinamides Reveal Notable Non-Bonded Intramolecular Interactions.Chemistry (Weinheim an der Bergstrasse, Germany) · 2021Article
- Mutational and Functional Analyses of Substrate Binding and Catalysis of theBiochemistry · 2020Article
- A New Class of EutT ATP:Co(I)rrinoid Adenosyltransferases Found in Listeria monocytogenes and Other Firmicutes Does Not Require a Metal Ion for Activity.Biochemistry · 2018Article
- Spectroscopic Study of the EutT Adenosyltransferase from Listeria monocytogenes: Evidence for the Formation of a Four-Coordinate Cob(II)alamin Intermediate.Biochemistry · 2018Article
- Development of CHARMM-Compatible Force-Field Parameters for Cobalamin and Related Cofactors from Quantum Mechanical Calculations.Journal of chemical theory and computation · 2018Article
- Microbial production of vitamin BMicrobial cell factories · 2017Review
- Article
- Computational, electrochemical, and spectroscopic studies of two mononuclear cobaloximes: the influence of an axial pyridine and solvent on the redox behaviour and evidence for pyridine coordination to cobalt(i) and cobalt(ii) metal centres.Dalton transactions (Cambridge, England : 2003) · 2016Article
- Spectroscopic Studies of the EutT Adenosyltransferase from Salmonella enterica: Mechanism of Four-Coordinate Co(II)Cbl Formation.Journal of the American Chemical Society · 2016Article
- Unprecedented Mechanism Employed by the Salmonella enterica EutT ATP:Co(I)rrinoid Adenosyltransferase Precludes Adenosylation of Incomplete Co(II)rrinoids.Angewandte Chemie (International ed. in English) · 2015Article
- Spectroscopic studies of the Salmonella enterica adenosyltransferase enzyme SeCobA: molecular-level insight into the mechanism of substrate Cob(II)alamin activation.Biochemistry · 2014Article
- the Eutt enzyme of Salmonella enterica is a unique ATP:Cob(I)alamin adenosyltransferase metalloprotein that requires ferrous ions for maximal activity.Journal of bacteriology · 2014Article
- Kinetics and mechanism of oxidation of super-reduced cobalamin and cobinamide species by thiosulfate, sulfite and dithionite.Dalton transactions (Cambridge, England : 2003) · 2013Article
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4 authors at 2 institutions in 1 country.
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Abstract
atpco(I)rrinoid adenosyltransferases (ACATs) are enzymes that catalyze the formation of adenosylcobalamin (AdoCbl, coenzyme B(12)) from cobalamin and ATP. There are three families of ACATs, namely, CobA, EutT, and PduO. In Salmonella enterica, CobA is the housekeeping enzyme that is required for de novo AdoCbl synthesis and for salvaging incomplete precursors and cobalamin from the environment. Here, we report the crystal structure of CobA in complex with ATP, four-coordinate cobalamin, and five-coordinate cobalamin. This provides the first crystallographic evidence of the existence of cob(II)alamin in the active site of CobA. The structure suggests a mechanism in which the enzyme adopts a closed conformation and two residues, Phe91 and Trp93, displace 5,6-dimethylbenzimidazole, the lower nucleotide ligand base of cobalamin, to generate a transient four-coordinate cobalamin, which is critical in the formation of the AdoCbl Co-C bond. In vivo and in vitro mutational analyses of Phe91 and Trp93 emphasize the important role of bulky hydrophobic side chains in the active site. The proposed manner in which CobA increases the redox potential of the cob(II)alamin/cob(I)alamin couple to facilitate formation of the Co-C bond appears to be analogous to that utilized by the PduO-type ACATs, where in both cases the polar coordination of the lower ligand to the cobalt ion is eliminated by placing that face of the corrin ring adjacent to a cluster of bulky hydrophobic side chains.
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