The three dimensional distributions on the ribosome of elongation and initiation factors, of large and small subunit proteins, and of specific regions of RNA, will be determined. Other functional sites such as the peptidyl transferase and the exit site of the nascent polypeptide chain will also be mapped. Subunits will be reacted with antibodies directed against specific ribosomal proteins, against factors or against specific regions of RNA and observed by electron microscopy. Three dimensional sites will be mapped by comparing images of subunits (with attached antibodies) in different orientations. Our objective will be to relate the three dimensional structure of the tibosome to its function during protein synthesis. The small subunit is responsible for recongnizing the initiation site of mRNA with the participation of initiation factors and fmet-tRNA, for binding aminoacyl rRNAs, for associating with the large subunit, and for regulating the translational fidelity of messenger reading. The large subunit binds the acceptor stem of aminoacyl tRNA's entering the A site; catalyzes peptidyl transfer,and participates in elongation and translocation. By relating the three dimensional distributions of ribosomal proteins, factors and regions of RNA's with known biochemical information, we will attempt to elucidate the structural aspects of the molecular events occurring during protein synthesis. Comparative studies of ribosome structure will also be pursued in order to relate common structural features of prokaryotic, eukaryotic, and organellar ribosomes to common functions in protein synthesis.

Agency
National Institute of Health (NIH)
Institute
National Institute of General Medical Sciences (NIGMS)
Type
Research Project (R01)
Project #
5R01GM024034-09
Application #
3272029
Study Section
Molecular Biology Study Section (MBY)
Project Start
1978-12-01
Project End
1986-11-30
Budget Start
1984-12-01
Budget End
1985-11-30
Support Year
9
Fiscal Year
1985
Total Cost
Indirect Cost
Name
University of California Los Angeles
Department
Type
Schools of Arts and Sciences
DUNS #
119132785
City
Los Angeles
State
CA
Country
United States
Zip Code
90095
Tsay, Y F; Shankweiler, G; Lake, J et al. (1994) Localization of Saccharomyces cerevisiae ribosomal protein L16 on the surface of 60 S ribosomal subunits by immunoelectron microscopy. J Biol Chem 269:7579-86
Oakes, M I; Lake, J A (1990) DNA-hybridization electron microscopy. Localization of five regions of 16 S rRNA on the surface of 30 S ribosomal subunits. J Mol Biol 211:897-906
Oakes, M I; Kahan, L; Lake, J A (1990) DNA-hybridization electron microscopy tertiary structure of 16 S rRNA. J Mol Biol 211:907-18
Oakes, M; Scheinman, A; Rivera, M et al. (1987) Evolving ribosome structure and function: rRNA and the translation mechanism. Cold Spring Harb Symp Quant Biol 52:675-85
Lake, J A (1987) Prokaryotes and archaebacteria are not monophyletic: rate invariant analysis of rRNA genes indicates that eukaryotes and eocytes form a monophyletic taxon. Cold Spring Harb Symp Quant Biol 52:839-46
Lake, J A (1987) Determining evolutionary distances from highly diverged nucleic acid sequences: operator metrics. J Mol Evol 26:59-73
Lake, J A (1987) A rate-independent technique for analysis of nucleic acid sequences: evolutionary parsimony. Mol Biol Evol 4:167-91
Reisler, E; Cheung, P; Borochov, N et al. (1986) Monomers, dimers, and minifilaments of vertebrate skeletal myosin in the presence of sodium pyrophosphate. Biochemistry 25:326-32
Langer, J A; Lake, J A (1986) Elongation factor Tu localized on the exterior surface of the small ribosomal subunit. J Mol Biol 187:617-21
Oakes, M I; Clark, M W; Henderson, E et al. (1986) DNA hybridization electron microscopy: ribosomal RNA nucleotides 1392-1407 are exposed in the cleft of the small subunit. Proc Natl Acad Sci U S A 83:275-9

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