Guanosine 5'-monophosphate oxidoreductase YPTB0703 guaC GUAC_YERPS GMP reductase 347 MRIEEGLKLGFKDVLIRPKRSTLKSRSEVALERQFTFKHSGWNWSGVPIIAANMDTVGTFRMAEVLASFDILTAVHKHYTLEQWAEFVKRSPESVLRHVMVSTGTSSADFDKMKQILALSPSLKFICIDVANGYSEHFVSFLQRAREACPDKVICAGNVVTGEMVEELILSGADIVKVGIGPGSVCTTRVKTGVGYPQLSAVIECADAAHGLGGQIVSDGGCSVPGDVAKAFGGGADFVMLGGMLAGHDECEGRVVEENGEKFMLFYGMSSESAMKRHVGGVAQYRAAEGKTVKLPLRGSVDNTVRDIMGGLRSACTYVGASHLKELTKRTTFIRVAEQENRVFGTD Catalyzes the irreversible NADPH-dependent deamination of GMP to IMP. It functions in the conversion of nucleobase, nucleoside and nucleotide derivatives of G to A nucleotides, and in maintaining the intracellular balance of A and G nucleotides (By similarity).