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“At lower guanosine levels in the presence of ribose , cell guanine concentrations limit the rate of guanosine incorporation into 5′-nucleotides.”
“The data presented show significant incorporation of guanosine into the 5′-nucleotide pool, and a marked stimulation of that incorporation by ribose.”
“ Ribose 1-phosphate, another product of the reaction, gave noncompetitive inhibition with guanosine as variable substrate, and an inhibition constant of 3.61 x 10(-4) M was calculated.”
The Journal of biological chemistry • 1976 | View Paper
“Under these conditions ribose also reacts with the primary amine group of adenosine, guanosine and probably guanine to form the corresponding ribosylaminopurines, while hypoxanthine fails to react.”