Understanding the process whereby the ribosome translates the genetic code into protein molecules will ultimately require high-resolution structural information, and we report here the first crystal structure of a protein from the small ribosomal subunit ...
Understanding the process whereby the ribosome translates the genetic code into protein molecules will ultimately require high-resolution structural information, and we report here the first crystal structure of a protein from the small ribosomal subunit. This protein, S5, has a molecular mass of 17,500 and is highly conserved in all lifeforms. The molecule contains two distinct alpha/beta domains that have structural similarities to several other proteins that are components of ribonucleoprotein complexes. Mutations in S5 result in several phenotypes which suggest that S5 may have a role in translational fidelity and translocation. These include ribosome ambiguity or ram, reversion from streptomycin dependence and resistance to spectinomycin. Also, a cold-sensitive, spectinomycin-resistant mutant of S5 has been identified which is defective in initiation. Here we show that these mutations map to two distinct regions of the molecule which seem to be sites of interaction with ribosomal RNA. A structure/function analysis of the molecule reveals discrepancies with current models of the 30S subunit.
Related Citations:
Model for the Three-Dimensional Folding of 16S Ribosomal RNA Stern, S., Weiser, B., Noller, H.F. (1988) J Mol Biol 204: 447
Proteins of the Bacillus Stearothermophilus Ribosome: A 5A Structure Analysis of Protein S5 White, S.W., Appelt, K., Dijk, J., Wilson, K.S. (1983) FEBS Lett 163: 73
Proteins of the Bacillus Stearothermophilus Ribosome. Crystallization of Proteins L30 and S5 Appelt, K., White, S.W., Wilson, K.S. (1983) J Biol Chem 258: 13328
Effect of Different Mutations in Ribosomal Protein S5 of Escherichia Coli on Translational Fidelity Piepersberg, W., Bock, A., Wittmann, H.-G. (1975) Mol Gen Genet 140: 91
Genetic Position and Amino Acid Replacements of Several Mutations in Ribosomal Protein S5 from Escherichia Coli Piepersberg, W., Bock, A., Yaguchi, M., Wittmann, H.-G. (1975) Mol Gen Genet 143: 43
Organizational Affiliation:
Biology Department, Brookhaven National Laboratory, Upton, New York 11973.
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