1sdw
Reduced (Cu+) peptidylglycine alpha-hydroxylating monooxygenase with bound peptide and dioxygenReduced (Cu+) peptidylglycine alpha-hydroxylating monooxygenase with bound peptide and dioxygen
Structural highlights
FunctionAMD_RAT Bifunctional enzyme that catalyzes 2 sequential steps in C-terminal alpha-amidation of peptides. The monooxygenase part produces an unstable peptidyl(2-hydroxyglycine) intermediate that is dismutated to glyoxylate and the corresponding desglycine peptide amide by the lyase part. C-terminal amidation of peptides such as neuropeptides is essential for full biological activity. Evolutionary Conservation Check, as determined by ConSurfDB. You may read the explanation of the method and the full data available from ConSurf. Publication Abstract from PubMedCopper active sites play a major role in enzymatic activation of dioxygen. We trapped the copper-dioxygen complex in the enzyme peptidylglycine-alphahydroxylating monooxygenase (PHM) by freezing protein crystals that had been soaked with a slow substrate and ascorbate in the presence of oxygen. The x-ray crystal structure of this precatalytic complex, determined to 1.85-angstrom resolution, shows that oxygen binds to one of the coppers in the enzyme with an end-on geometry. Given this structure, it is likely that dioxygen is directly involved in the electron transfer and hydrogen abstraction steps of the PHM reaction. These insights may apply to other copper oxygen-activating enzymes, such as dopamine beta-monooxygenase, and to the design of biomimetic complexes. Dioxygen binds end-on to mononuclear copper in a precatalytic enzyme complex.,Prigge ST, Eipper BA, Mains RE, Amzel LM Science. 2004 May 7;304(5672):864-7. PMID:15131304[1] From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See AlsoReferences
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