在嘌呤核苷酸的从头合成中，IMP是支点代谢物，在支点代谢物处，途径分化为鸟嘌呤或腺嘌呤核苷酸的合成。在鸟嘌呤核苷酸途径中，有2种酶参与IMP转化为GMP，即IMP脱氢酶（IMPd1），它催化IMP氧化成XMP和GMP合成酶，催化XMP向GMP的胺化。[由RefSeq提供，2008年7月]
In the de novo synthesis of purine nucleotides, IMP is the branch point metabolite at which point the pathway diverges to the synthesis of either guanine or adenine nucleotides. In the guanine nucleotide pathway, there are 2 enzymes involved in converting IMP to GMP, namely IMP dehydrogenase (IMPD1), which catalyzes the oxidation of IMP to XMP, and GMP synthetase, which catalyzes the amination of XMP to GMP. [provided by RefSeq, Jul 2008]