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Matching the crystallographic structure of ribosomal protein S7 to a three-dimensional model of the 16S ribosomal RNA

Published online by Cambridge University Press:  01 May 1998

ISAO TANAKA
Affiliation:
Graduate School of Science, Hokkaido University, Sapporo 060, Japan
ATSUSHI NAKAGAWA
Affiliation:
Graduate School of Science, Hokkaido University, Sapporo 060, Japan
HARUMI HOSAKA
Affiliation:
Graduate School of Science, Hokkaido University, Sapporo 060, Japan
SOICHI WAKATSUKI
Affiliation:
European Synchrotron Radiation Facility, Polygone Scientifique, Avenue des Martyrs, 38043 Grenoble, France
FLORIAN MUELLER
Affiliation:
Max-Planck-Institut für Molekulare Genetik, Ihnestrasse 73, 14195 Berlin, Germany
RICHARD BRIMACOMBE
Affiliation:
Max-Planck-Institut für Molekulare Genetik, Ihnestrasse 73, 14195 Berlin, Germany
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Abstract

Two recently published but independently derived structures, namely the X-ray crystallographic structure of ribosomal protein S7 and the “binding pocket” for this protein in a three-dimensional model of the 16S rRNA, have been correlated with one another. The known rRNA–protein interactions for S7 include a minimum binding site, a number of footprint sites, and two RNA–protein crosslink sites on the 16S rRNA, all of which form a compact group in the published 16S rRNA model (despite the fact that these interactions were not used as primary modeling contraints in building that model). The amino acids in protein S7 that are involved in the two crosslinks to 16S rRNA have also been determined in previous studies, and here we have used these sites to orient the crystallographic structure of S7 relative to its rRNA binding pocket. Some minor alterations were made to the rRNA model to improve the fit. In the resulting structure, the principal positively charged surface of the protein is in contact with the 16S rRNA, and all of the RNA–protein interaction data are satisfied. The quality of the fit gives added confidence as to the validity of the 16S rRNA model. Protein S7 is furthermore known to be crosslinked both to P site-bound tRNA and to mRNA at positions upstream of the P site codon; the matched S7-16S rRNA structure makes a prediction as to the location of this crosslink site within the protein molecule.

Type
Research Article
Copyright
1998 RNA Society

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