a menaquinone + succinate + 2 H(+)(out) => a menaquinol + fumarate + 2 H(+)(in)
a menaquinone + succinate + 2 h(+)(out) => a menaquinol + fumarate + 2 h(+)(in)
a menaquinone + succinate + 2 H(+)(out) => a menaquinol + fumarate + 2 H(+)(in)
a menaquinone + succinate + 2 h(+)(out) => a menaquinol + fumarate + 2 h(+)(in)