3-methylbutanoyl-CoA + oxidized [electron-transfer flavoprotein] + H(+) = 3-methylbut-2-enoyl-CoA + reduced [electron-transfer flavoprotein]
3-methylbutanoyl-coa + oxidized [electron-transfer flavoprotein] + h(+) = 3-methylbut-2-enoyl-coa + reduced [electron-transfer flavoprotein]