Selection of suppressor methionyl-tRNA synthetases: mapping the tRNA anticodon binding site.
- 1 January 1991
- journal article
- Published by Proceedings of the National Academy of Sciences in Proceedings of the National Academy of Sciences
- Vol. 88 (1) , 291-295
- https://doi.org/10.1073/pnas.88.1.291
Abstract
Accurate aminoacylation of a tRNA by Escherichia coli methionyl-tRNA synthetase (MTS) is specified by the CAU anticodon. A genetic screening procedure was designed to isolate MTS mutants able to aminoacylate a methionine amber tRNA (CUA anticodon). Selected suppressor MTS enzymes all possess one or several mutations in the vicinity of Trp-461, a residue that is the major contributor to the stability of complexes formed with tRNAs having the cognate CAU anticodon. Analysis of catalytic properties of purified suppressor enzymes shows that they have acquired an additional specificity toward the amber anticodon without complete disruption of the methionine anticodon site. It is concluded that both positive and negative discrimination toward the binding of tRNA anticodon sequences is restricted to a limited region of the synthetase, residues 451-467.Keywords
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