H2 + a menaquinone + 2 H(+)(in) = a menaquinol + 2 H(+)(out)
h2 + a menaquinone + 2 h(+)(in) = a menaquinol + 2 h(+)(out)
H2 + a menaquinone + 2 H(+)(in) = a menaquinol + 2 H(+)(out)
h2 + a menaquinone + 2 h(+)(in) = a menaquinol + 2 h(+)(out)