1887

Microbiology

Volume 155, Issue 1

Interaction of the mechanism-based inactivator acetylene with ammonia monooxygenase of Free

Abstract

The ammonia monooxygenase (AMO) of is a metalloenzyme that catalyses the oxidation of ammonia to hydroxylamine. We have identified histidine 191 of AmoA as the binding site for the oxidized mechanism-based inactivator acetylene. Binding of acetylene changed the molecular mass of His-191 from 155.15 to 197.2 Da (+42.05), providing evidence that acetylene was oxidized to ketene (CHCO; 42.04 Da) which binds specifically to His-191. It must be assumed that His-191 is part of the acetylene-activating site in AMO or at least directly neighbours this site.

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  • Published Online:
Keyword(s): AMO, ammonia monooxygenase and pMMO and sMMO, particulate and soluble methane monooxygenase
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2009-01-01
2019-10-24
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Interaction of the mechanism-based inactivator acetylene with ammonia monooxygenase of Nitrosomonas europaea
Microbiology 155, 279 (2009); https://doi.org/10.1099/mic.0.023721-0
/content/journal/micro/10.1099/mic.0.023721-0
/content/journal/micro/10.1099/mic.0.023721-0
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