streptomycin + GTP <=> 6-O-guanylylstreptomycin + diphosphate
streptomycin + gtp <=> 6-o-guanylylstreptomycin + diphosphate
streptomycin + GTP <=> 6-O-guanylylstreptomycin + diphosphate
streptomycin + gtp <=> 6-o-guanylylstreptomycin + diphosphate