1MED: METHIONYL-TRNA SYNTHETASE ZINC BINDING DOMAIN. 3D STRUCTURE AND HOMOLOGY WITH RUBREDOXIN AND GAG RETROVIRAL PROTEINS

Citation:
Abstract
Methionyl-tRNA synthetase from Escherichia coli contains one tightly bound zinc atom per subunit. The region encompassing residues 138 to 163 of this enzyme is responsible for the metal binding. A 28-mer peptide corresponding to these residues was expressed in vivo and shown to contain approximately 1 mol of tightly bound Zn/mol of peptide. In this study, the three-dimensional solution structure of this peptide was solved by means of two-dimensional proton NMR spectroscopy. A total of 133 nuclear Overhauser effect distance constraints and 22 dihedral angle restraints were used for the calculations, using a hybrid distance-geometry-simulated annealing strategy. Excluding the first four residues, the resulting structure is well-defined (r.m.s.d. 0.71 A for backbone atoms) and composed of a series of four tight turns. The second and the fourth turns are composed of CXXC sequences which are structurally homologous to the NH-S turns found in the metal binding sites of gag retroviral proteins and rubredoxin. The solution structure of the zinc binding peptide shows significant discrepancies with the crystal structure of methionyl-tRNA synthetase.
PDB ID: 1MEDDownload
MMDB ID: 56838
PDB Deposition Date: 1992/11/9
Updated in MMDB: 2017/12
Experimental Method:
solution nmr
Source Organism:
Similar Structures:
Biological Unit for 1MED: monomeric; determined by author
Molecular Components in 1MED
Label Count Molecule
Protein (1 molecule)
1
Methionyl-trna Synthetase(Gene symbol: metG)
Molecule annotation
Chemical (1 molecule)
1
1
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