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- W1986510144 abstract "Monomeric sarcosine oxidase (MSOX) is a prototypical member of a recently recognized family of amine-oxidizing enzymes that all contain covalently bound flavin. Mutation of the covalent flavin attachment site in MSOX produces a catalytically inactive apoprotein (apoCys315Ala) that forms an unstable complex with FAD (K(d) = 100 muM), similar to that observed with wild-type apoMSOX where the complex is formed as an intermediate during covalent flavin attachment. In situ reconstitution of sarcosine oxidase activity is achieved by assaying apoCys315Ala in the presence of FAD or 8-nor-8-chloroFAD, an analogue with an approximately 55 mV higher reduction potential. After correction for an estimated 65% reconstitutable apoprotein, the specific activity of apoCys315Ala in the presence of excess FAD or 8-nor-8-chloroFAD is 14% or 80%, respectively, of that observed with wild-type MSOX. Unlike oxidized flavin, apoCys315Ala exhibits a high affinity for reduced flavin, as judged by results obtained with reduced 5-deazaFAD (5-deazaFADH(2)) where the estimated binding stoichiometry is unaffected by dialysis. The Cys315Ala.5-deazaFADH(2) complex is also air-stable but is readily oxidized by sarcosine imine, a reaction accompanied by release of weakly bound oxidized 5-deazaFAD. The dramatic difference in the binding affinity of apoCys315Ala for oxidized and reduced flavin indicates that the protein environment must induce a sizable increase in the reduction potential of noncovalently bound flavin (DeltaE(m) approximately 120 mV). The covalent flavin linkage prevents loss of weakly bound oxidized FAD and also modulates the flavin reduction potential in conjunction with the protein environment." @default.
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- W1986510144 date "2006-07-15" @default.
- W1986510144 modified "2023-09-25" @default.
- W1986510144 title "Role of the Covalent Flavin Linkage in Monomeric Sarcosine Oxidase" @default.
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- W1986510144 doi "https://doi.org/10.1021/bi0607352" @default.
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