title: Purine-amino acid hydrogen bonding interactions and suggestions for modeling the lac operator-repressor system.
mesh_terms: D000596:Amino Acids / Q000378:metabolism*; D006860:Hydrogen Bonding; D007763:Lac Operon; D008954:Models, Biological; D008968:Molecular Conformation; D011485:Protein Binding; D011687:Purines / Q000378:metabolism*; D011789:Quantum Theory; D012097:Repressor Proteins / Q000378:metabolism*; D013816:Thermodynamics; D014157:Transcription Factors / Q000378:metabolism*
chemical_list: D000596:Amino Acids; D011687:Purines; D012097:Repressor Proteins; D014157:Transcription Factors