Resonance Raman study on complexes of medium-chain acyl-CoA dehydrogenase.
Resonance Raman (RR) spectra of the complex of pig kidney medium-chain acyl-CoA dehydrogenase with acetoacetyl-CoA and of the purple complex formed upon the addition of octanoyl-CoA to the dehydrogenase were obtained. RR spectra were also measured for the complexes prepared by using isotopically labeled compounds, i.e., [3-13C]-, [1,3-13C]-, and [2,4-13C2]acetoacetyl-CoA; [1-13C]octanoyl-CoA; the dehydrogenase reconstituted with [4a-13C]- and [4,10a-13C2]FAD. Both bands of oxidized flavin and acetoacetyl-CoA were resonance-enhanced in the 632.8 nm excited spectra of the acetoacetyl-CoA complex; this confirms that the broad long-wavelength absorption band is a charge-transfer absorption band between oxidized flavin and acetoacetyl-CoA. The 1,622 cm-1 band was assigned to the C(3)=O stretching mode coupling with the C(2)-H bending mode of the enolate form of acetoacetyl-CoA and the bands at 1,483 and 1,119 cm-1 were assigned to bands associated with the C(2)=C(1)-O- moiety. Both bands of fully reduced flavin and the substrate were resonance-enhanced in the 632.8 nm excited spectra of the purple complex. As the enzyme is already reduced, the substrate must be oxidized to octenoyl-CoA; the complex is a charge-transfer complex between the reduced enzyme and octenoyl-CoA. The low frequency value of the 1,577 cm-1 band, which is associated with the C(2)-C(1)=O moiety of the octenoyl-CoA, suggests that the enzyme-bound octenoyl-CoA has an appreciable contribution of C(2)=C(1)-O-.(ABSTRACT TRUNCATED AT 250 WORDS)
Nishina
Y
Y
Department of Physiology, Kumamoto University Medical School.
Sato
K
K
Shiga
K
K
Fujii
S
S
Kuroda
K
K
Miura
R
R
D000105:Acetyl Coenzyme A; D000214:Acyl Coenzyme A; D042964:Acyl-CoA Dehydrogenase; D044944:Acyl-CoA Dehydrogenases / Q000737:chemistry*; D000818:Animals; D004563:Electrochemistry; D005415:Flavins / Q000737:chemistry; D007668:Kidney / Q000201:enzymology; D015394:Molecular Structure; D010084:Oxidation-Reduction; D013059:Spectrum Analysis, Raman; D013379:Substrate Specificity; D013552:Swine
D000214:Acyl Coenzyme A; D005415:Flavins; C034681:octanoyl-coenzyme A; C010667:acetoacetyl CoA; D000105:Acetyl Coenzyme A; D044944:Acyl-CoA Dehydrogenases; D042964:Acyl-CoA Dehydrogenase