OoC-CH2 _8 coo Fumarate NH2 GTP GDP+P N N N Aspartate Rib(P Rib Adenylosuccinate Adenylate (AMP) P Inosinate 2O (MP) NAD NADH +H GIn Glu AMP +PP HN HO H P RibS Xanthylate Guanylate (XMP) (GMP) IMP is converted to AMP by accepting an amino group from Asp(GTP is needed to activate Asp)and to GMP by accepting an amino group from GIn(ATP is needed to activate XMPIMP is converted to AMP by accepting an amino group from Asp (GTP is needed to activate Asp) and to GMP by accepting an amino group from Gln (ATP is needed to activate XMP)