(2S)-2-methylbutanoyl-CoA + oxidized [electron-transfer flavoprotein] + H(+) => (2E)-2-methylbut-2-enoyl-CoA + reduced [electron-transfer flavoprotein]
(2s)-2-methylbutanoyl-coa + oxidized [electron-transfer flavoprotein] + h(+) => (2e)-2-methylbut-2-enoyl-coa + reduced [electron-transfer flavoprotein]
(2S)-2-methylbutanoyl-CoA + oxidized [electron-transfer flavoprotein] + H(+) => (2E)-2-methylbut-2-enoyl-CoA + reduced [electron-transfer flavoprotein]
(2s)-2-methylbutanoyl-coa + oxidized [electron-transfer flavoprotein] + h(+) => (2e)-2-methylbut-2-enoyl-coa + reduced [electron-transfer flavoprotein]