Crystal structures of three misacylating mutants of Escherichia coli glutaminyl-tRNA synthetase complexed with tRNA(Gln) and ATP.Arnez, J.G., Steitz, T.A.
(1996) Biochemistry 35: 14725-14733
- PubMed: 8942633
- DOI: 10.1021/bi961532o
- Primary Citation of Related Structures:
- PubMed Abstract:
- Structure of E. Coli Glutaminyl-tRNA Synthetase Complexed with tRNA(Gln) and ATP at 2.8 A Resolution
Rould, M.A.,Perona, J.J.,Soll, D.,Steitz, T.A.
(1989) Science 246: 1135
- Structural Basis of Anticodon Loop Recognition by Glutaminyl-tRNA Synthetase
Rould, M.A.,Perona, J.J.,Steitz, T.A.
(1991) Nature 352: 213
- Structural Basis for Misaminoacylation by Mutant E. Coli Glutaminyl-tRNA Synthetase Enzymes
Perona, J.J.,Swanson, R.N.,Rould, M.A.,Steitz, T.A.,Soll, D.
(1989) Science 246: 1152
- Transfer RNA Mischarging Mediated by a Mutant Escherichia Coli Glutaminyl-tRNA Synthetase
Inokuchi, H.,Hoben, P.,Yamao, F.,Ozeki, H.,Soll, D.
(1984) Proc.Natl.Acad.Sci.USA 81: 5076
Three previously described mutant Escherichia coli glutaminyl-tRNA synthetase (GlnRS) proteins that incorrectly aminoacylate the amber suppressor derived from tRNATyr (supF) with glutamine were cocrystallized with wild-type tRNAGln and their structur ...
Three previously described mutant Escherichia coli glutaminyl-tRNA synthetase (GlnRS) proteins that incorrectly aminoacylate the amber suppressor derived from tRNATyr (supF) with glutamine were cocrystallized with wild-type tRNAGln and their structures determined. In two of the mutant enzymes studied, Asp235, which contacts base pair G3-C70 in the acceptor stem, has been changed to asparagine in GlnRS7 and to glycine in GlnRS10. These mutations result in changed interactions between Asn235 of GlnRS7 and G3-C70 of the tRNA and an altered water structure between Gly235 of GlnRS10 and base pair G3-C70. These structures suggest how the mutant enzymes can show only small changes in their ability to aminoacylate wild-type cognate tRNA on the one hand and yet show a lack of discrimination against a noncognate U3-A70 base pair on the other. In contrast, the change of Ile129 to Thr in GlnRS15 causes virtually no change in the structure of the complex, and the explanation for its ability to misacylate supF is unclear.
Department of Molecular Biophysics and Biochemistry, Yale University, New Haven, Connecticut 06520-8114, USA.