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| MUTATIONAL ISOLATION OF A SIEVE FOR EDITING IN A TRANSFER-RNA SYNTHETASE |
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| Author(s): SCHMIDT E, SCHIMMEL P |
| Source: SCIENCE Volume: 264 Issue: 5156 Pages: 265-267 Published: APR 8 1994 |
| Times Cited: 102 References: 36 |
| Abstract: Editing reactions are essential for the high fidelity of information transfer in processes such as replication, RNA splicing, and protein synthesis. The accuracy of interpretation of the genetic code is enhanced by the editing reactions of aminoacyl transfer RNA (tRNA) synthetases, whereby amino acids are prevented from being attached to the wrong tRNAs. Amino acid discrimination is achieved through sieves that may overlap with or coincide with the amino acid binding site. With the class I Escherichia coli isoleucine tRNA synthetase, which activates isoleucine and occasionally misactivates valine, as an example, a rationally chosen mutant enzyme was constructed that lacks entirely its normally strong ability to distinguish valine from isoleucine by the initial amino acid recognition sieve. The misactivated valine, however, is still eliminated by hydrolytic editing reactions. These data suggest that there is a distinct sieve for editing that is functionally independent of the amino acid binding site. |
| Document Type: Article |
| Language: English |
| Reprint Address: SCHMIDT, E (reprint author), MIT, DEPT BIOL, CAMBRIDGE, MA 02139 USA |
| Publisher: AMER ASSOC ADVANCEMENT SCIENCE, 1200 NEW YORK AVE, NW, WASHINGTON, DC 20005 |
| Subject Category: Multidisciplinary Sciences |
| IDS Number: NE410 |
| ISSN: 0036-8075 |
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| | | | | | | | | Record from Web of Science® | | | | | | | | | |