shikimate(out) + H(+)(out) => shikimate(in) + H(+)(in)
shikimate(out) + h(+)(out) => shikimate(in) + h(+)(in)
shikimate(out) + H(+)(out) => shikimate(in) + H(+)(in)
shikimate(out) + h(+)(out) => shikimate(in) + h(+)(in)