a gentamycin 2''-phosphate + GDP + H(+) => a gentamycin + GTP
a gentamycin 2''-phosphate + gdp + h(+) => a gentamycin + gtp
a gentamycin 2''-phosphate + GDP + H(+) => a gentamycin + GTP
a gentamycin 2''-phosphate + gdp + h(+) => a gentamycin + gtp