1EFM

STRUCTURE OF THE GDP DOMAIN OF EF-TU AND LOCATION OF THE AMINO ACIDS HOMOLOGOUS TO RAS ONCOGENE PROTEINS

Summary for 1EFM

• Entry DOI: 10.2210/pdb1efm/pdb
• Descriptor: ELONGATION FACTOR TU, MAGNESIUM ION, GUANOSINE-5'-DIPHOSPHATE (3 entities in total)
• Functional Keywords: elongation factor
• Biological source: Escherichia coli
• Total number of polymer chains: 1
• Total formula weight: 42119.12

Authors

Jurnak, F. (deposition date: 1987-05-29, release date: 1987-07-16, Last modification date: 2024-02-07)

Primary citation

Jurnak, F.
Structure of the GDP domain of EF-Tu and location of the amino acids homologous to ras oncogene proteins.
Science, 230:32-36, 1985

PubMed Abstract: A 2.7 angstrom resolution x-ray diffraction analysis of a trypsin-modified form of the Escherichia coli elongation factor Tu reveals that the GDP-binding domain has a structure similar to that of other nucleotide-binding proteins. The GDP ligand is located at the COOH-terminal end of the beta sheet and is linked to the protein via a Mg2+ ion salt bridge. The location of the guanine ring is unusual; the purine ring is located on the outer edge of the domain, not deep within a hydrophobic pocket. The amino acids from Pro10 to Arg44 and from Gly59 to Glu190 have been assigned to the electron density with computer graphic techniques, and the resulting model is consistent with all known biochemical data. An analysis of the structure reveals that four regions of the amino acid sequence that are homologous with the family of ras oncogene proteins, termed p21, are located in the vicinity of the GDP-binding site, and most of the invariant amino acids shared by the proteins interact directly with the GDP ligand.

PubMed: 3898365

Experimental method

X-RAY DIFFRACTION (2.7 Å)