| Increase in fidelity of rat liver Ile-tRNA formation by both spermine and the aminoacyl-tRNA synthetase complex. | |
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MedLine Citation:
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PMID: 1898044 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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To examine the polyamine effects on the fidelity at the aminoacylation level and the physiological significance of the existence of the aminoacyl-tRNA synthetase complex (ARSC) in animal cells, a single-chain Ile-tRNA synthetase (IRSS) was isolated from the complex by treatment with trypsin. Ile-tRNA formation by IRSS was strongly stimulated by spermine, similar to the results with ARSC. Two misacylations (Val-tRNAIle and Ile-tRNAiMet formation) by IRSS were measured. The error frequency was higher in Ile-tRNAiMet formation (tRNA misacylation) than in Val-tRNAIle formation (amino acid misacylation). Spermine did not influence significantly Ile-tRNAiMet formation, but it stimulated Val-tRNAIle formation by IRSS. Accordingly, spermine decreased the error frequency of tRNA misacylation, but not amino acid misacylation. These results suggest that the conformational changes of individual tRNA by spermine differ from each other, meaning that spermine influences the interaction between individual tRNA and aminoacyl-tRNA synthetase variously. When the aminoacylations of tRNAIle from rat liver, yeast, and Escherichia coli were compared with ARSC and IRSS, the relative speed of Ile-tRNA formation with tRNAIle from other species was faster with IRSS than with ARSC. This indicates that ARSC can recognize tRNAIle from the same species more specifically than IRSS. These results show that both spermine and ARSC are involved in the increase of fidelity of rat liver Ile-tRNA formation. |
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Authors:
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K Kusama-Eguchi; M Irisawa; S Watanabe; K Watanabe; K Igarashi |
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Publication Detail:
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Type: Comparative Study; Journal Article; Research Support, Non-U.S. Gov't |
Journal Detail:
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Title: Archives of biochemistry and biophysics Volume: 288 ISSN: 0003-9861 ISO Abbreviation: Arch. Biochem. Biophys. Publication Date: 1991 Aug |
Date Detail:
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Created Date: 1991-10-24 Completed Date: 1991-10-24 Revised Date: 2006-11-15 |
Medline Journal Info:
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Nlm Unique ID: 0372430 Medline TA: Arch Biochem Biophys Country: UNITED STATES |
Other Details:
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Languages: eng Pagination: 495-9 Citation Subset: IM |
Affiliation:
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Faculty of Pharmaceutical Sciences, Chiba University, Japan. |
Export Citation:
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APA/MLA Format Download EndNote Download BibTex |
| MeSH Terms | |
Descriptor/Qualifier:
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Acylation Amino Acyl-tRNA Synthetases / isolation & purification, metabolism* Animals Escherichia coli / enzymology Isoleucine-tRNA Ligase / metabolism* Kinetics Liver / drug effects, enzymology* Magnesium / pharmacology Multienzyme Complexes / isolation & purification, metabolism* RNA, Transfer, Ile / biosynthesis* Rats Saccharomyces cerevisiae / enzymology Spermine / pharmacology* Valine / pharmacology |
| Chemical | |
Reg. No./Substance:
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0/Multienzyme Complexes; 0/RNA, Transfer, Ile; 7004-03-7/Valine; 71-44-3/Spermine; 7439-95-4/Magnesium; EC 6.1.1.-/Amino Acyl-tRNA Synthetases; EC 6.1.1.5/Isoleucine-tRNA Ligase |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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