The long-term objectives of the research plan are to elucidate the structure-function relationships which control the elongation cycle during protein biosynthesis and to develop pharmacological agents which effectively inhibit growth in infectious bacteria and other rapidly growing cells such as tumors. The primary approach is to study the four EF-Tu complexes formed during the elongation cycle in E. coli by various techniques, including X-ray diffraction analysis. One short-term goal is to elucidate the atomic binding sites of several pharmacological agents on EF-Tu using a highly refined model of trypsin-modified EF-Tu-GDP as the starting model for difference Fourier or molecular replacement calculations. The pharmacological agents which have been cocrystallized with EF-Tu include the chemotherapeutic agent daunorubicin; and the antibiotics, tetracycline, puromycin, aurodox and thiostrepton. Another short-term goal is the structural determination of the EF-Tu-Ts complex. The major significance of this research is that the set of EF-Tu complexes is a good model system for understanding and controlling fundamental mechanisms which not only regulate the elongation cycle but which are mimicked by other normal and abnormal intercellular processes, including certain forms of oncogenesis. The significance of one set of short-term projects is the elucidation of drug binding sites on EF-Tu at the atomic level. Not only will this information contribute to an understanding of the mode of action of these pharmacological agents, but will provide atomic coordinates for the rational drug design for antibiotics and possibly chemotherapeutic agents. The significance of the EF-Tu-Ts project is that the studies will result in an atomic description of (1) a stable catalytic intermediate, (2) a good model system for understanding the GDP/GTP exchange mechanism in sensory and hormone receptor-G protein complexes, (3) and a recognition element in the initiation of RNA synthesis in RNA phages and possibly retroviruses.

Agency
National Institute of Health (NIH)
Institute
National Institute of General Medical Sciences (NIGMS)
Type
Research Project (R01)
Project #
5R01GM026895-13
Application #
2174840
Study Section
Biophysical Chemistry Study Section (BBCB)
Project Start
1979-08-01
Project End
1995-11-30
Budget Start
1993-12-01
Budget End
1994-11-30
Support Year
13
Fiscal Year
1994
Total Cost
Indirect Cost
Name
University of California Riverside
Department
Biochemistry
Type
Schools of Earth Sciences/Natur
DUNS #
City
Riverside
State
CA
Country
United States
Zip Code
92521
Heffron, Susan E; Mui, Suet; Aorora, Annette et al. (2006) Molecular complementarity between tetracycline and the GTPase active site of elongation factor Tu. Acta Crystallogr D Biol Crystallogr 62:1392-400
Murase, Katsuyuki; Morrison, Kim L; Tam, Phillip Y et al. (2003) EF-Tu binding peptides identified, dissected, and affinity optimized by phage display. Chem Biol 10:161-8
Heffron, S E; Jurnak, F (2000) Structure of an EF-Tu complex with a thiazolyl peptide antibiotic determined at 2.35 A resolution: atomic basis for GE2270A inhibition of EF-Tu. Biochemistry 39:37-45
Abel, K; Yoder, M D; Hilgenfeld, R et al. (1996) An alpha to beta conformational switch in EF-Tu. Structure 4:1153-9
Abel, K; Jurnak, F (1996) A complex profile of protein elongation: translating chemical energy into molecular movement. Structure 4:229-38
Manor, D; Weng, G Z; Deng, H et al. (1991) An isotope edited classical Raman difference spectroscopic study of the interactions of guanine nucleotides with elongation factor Tu and H-ras p21. Biochemistry 30:10914-20
Jurnak, F; Heffron, S; Schick, B et al. (1990) Three-dimensional models of the GDP and GTP forms of the guanine nucleotide domain of Escherichia coli elongation factor Tu. Biochim Biophys Acta 1050:209-14
Mui, S; Delaria, K; Jurnak, F (1990) Preliminary crystallographic analysis of a complex between tetracycline and the trypsin-modified form of Escherichia coli elongation factor Tu. J Mol Biol 212:445-7
Delaria, K; Jurnak, F (1989) Preparation of Escherichia coli elongation factor Tu-guanosine 5'-triphosphate analogs. Anal Biochem 177:188-93
McPherson, A; Jurnak, F; Singh, G J et al. (1987) Preliminary X-ray diffraction analysis of crystals of Bacillus thuringiensis toxin, a cell membrane disrupting protein. J Mol Biol 195:755-7

Showing the most recent 10 out of 15 publications