Crystal structure of glycinamide ribonucleotide transformylase from Escherichia coli at 3.0 A resolution. A target enzyme for chemotherapy.Chen, P., Schulze-Gahmen, U., Stura, E.A., Inglese, J., Johnson, D.L., Marolewski, A., Benkovic, S.J., Wilson, I.A.
(1992) J Mol Biol 227: 283-292
- PubMed: 1522592
- DOI: 10.1016/0022-2836(92)90698-j
- Primary Citation of Related Structures:
- PubMed Abstract:
- Preliminary Crystallographic Investigations of Glycinamide Ribonucleotide Transformylase in Escherichia Coli K12
Stura, E.A., Johnson, D.L., Inglese, J., Smith, J.M., Benkovic, S.J., Wilson, I.A.
(1989) J Biol Chem 264: 9703
- Identification and Nucleotide Sequence of a Gene Encoding 5'-Phosphoribosyl-Glycinamide Transformylase in Escherichia Coli K12
Smith, J.M., Daum III, H.A.
(1987) J Biol Chem 262: 10565
The atomic structure of glycinamide ribonucleotide transformylase, an essential enzyme in purine biosynthesis, has been determined at 3.0 A resolution. The last three C-terminal residues and a sequence stretch of 18 residues (residues 113 to 130) are not visible in the electron density map ...
The atomic structure of glycinamide ribonucleotide transformylase, an essential enzyme in purine biosynthesis, has been determined at 3.0 A resolution. The last three C-terminal residues and a sequence stretch of 18 residues (residues 113 to 130) are not visible in the electron density map. The enzyme forms a dimer in the crystal structure. Each monomer is divided into two domains, which are connected by a central mainly parallel seven-stranded beta-sheet. The N-terminal domain contains a Rossmann type mononucleotide fold with a phosphate ion bound to the C-terminal end of the first beta-strand. A long narrow cleft stretches from the phosphate to a conserved aspartic acid, Asp144, which has been suggested as an active-site residue. The cleft is lined by a cluster of residues, which are conserved between bacterial, yeast, avian and human enzymes, and likely represents the binding pocket and active site of the enzyme. GAR Tfase binds a reduced folate cofactor and glycinamide ribonucleotide for the catalysis of one of the initial steps in purine biosynthesis. Folate analogs and multi-substrate inhibitors of the enzyme have antineoplastic effects and the structure determination of the unliganded enzyme and enzyme-inhibitor complexes will aid the development of anti-cancer drugs.
Department of Molecular Biology, Scripps Research Institute, La Jolla, CA 92037.