a 2,3-saturated acyl-CoA + oxidized [electron-transfer flavoprotein] + H(+) => a (2E)-enoyl-CoA + reduced [electron-transfer flavoprotein]
a 2,3-saturated acyl-coa + oxidized [electron-transfer flavoprotein] + h(+) => a (2e)-enoyl-coa + reduced [electron-transfer flavoprotein]
a 2,3-saturated acyl-CoA + oxidized [electron-transfer flavoprotein] + H(+) => a (2E)-enoyl-CoA + reduced [electron-transfer flavoprotein]
a 2,3-saturated acyl-coa + oxidized [electron-transfer flavoprotein] + h(+) => a (2e)-enoyl-coa + reduced [electron-transfer flavoprotein]