Nucleotide-amino acid interactions in the L-His-IMP.MeOH.H(2)O complex.
In the crystal structure of the methanol-solvated monohydrated complex of L-histidine (His) with inosine 5'-monophosphate (IMP), namely L-histidinium inosine-5'-phosphate methanol solvate monohydrate, C(6)H(10)N(3)O(2)(+).C(10)H(12)N(4)O(8)P(-).CH(3)OH.H(2)O, most of the interactions between IMP anions (anti/C3'-endo/gauche-gauche conformers) are realized between the riboses and hypoxanthine bases in a trans sugar-edge/sugar-edge geometry, and between the phosphate groups. The base Watson-Crick edge is involved in additional methanol-mediated IMP...MeOH...IMP contacts. Specific and nonspecific nucleotide-amino acid (IMP...His) interactions engage the Hoogsteen edges of the base and phosphate group, respectively. Additional stabilization of His...IMP contacts is provided by pi-pi stacking between the imidazolium ring of His and the hypoxanthine base of IMP. The results may indicate the possible recognition mechanism between His and IMP.
Rlepokura
Katarzyna
K
Faculty of Chemistry, University of Wrocław, 14 Joliot-Curie Street, 50-383 Wrocław, Poland. slep@eto.wchuwr.pl
Petrus
Rafał
R
D000596:Amino Acids / Q000737:chemistry*; D001665:Binding Sites; D018360:Crystallography, X-Ray; D019281:Dimerization; D006639:Histidine / Q000031:analogs & derivatives* / Q000737:chemistry*; D007291:Inosine Monophosphate; D008958:Models, Molecular; D009690:Nucleic Acid Conformation; D009711:Nucleotides / Q000737:chemistry*
D000596:Amino Acids; C550415:L-histidinium inosine-5'-monophosphate; D009711:Nucleotides; D007291:Inosine Monophosphate; D006639:Histidine