Interaction of Turnip Yellow Mosaic Virus Val-RNA with Eukaryotic Elongation Factor EF-1 [alpha]. Search for a Function

Overview

Journal EMBO J

Specialties Biotechnology
Molecular Biology

Date 1986 Jun 1

PMID 11681331

Citations 32

Authors

R L Joshi

J M RAVEL

A L Haenni

Affiliations

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Abstract

The 3'-terminal tRNA-like structure in turnip yellow mosaic virus (TYMV) RNA can be adenylated by tRNA nucleotidyltransferase and subsequently aminoacylated by valyl-tRNA synthetase. Here we present evidence that TYMV Val-RNA can form a stable complex with eukaryotic wheat germ elongation factor EF-1alpha and GTP: the Val-RNA is protected by EF-1alpha.. GTP against digestion by RNase A. By affinity chromatography of TYMV Val-RNA fragments on immobilized EF-1alpha . GTP, it has been established that the valylated aminoacyl RNA domain, which in TYMV RNA is formed by the 3' half of the tRNA-like region, is sufficient for complex formation with EF-1alpha . GTP. The aminoacyl RNA domain is equivalent in tRNAs to the continuous helix formed by the acceptor stem and the T stem and loop. In line with these results, the aminoacyl RNA domain in TYMV Val-RNA complexed to EF-1 alpha . GTP is resistant to digestion by RNase A. It is also shown that the TYMV RNA replicase (RNA-dependent RNA polymerase) isolated from TYMV-infected Chinese cabbage leaves does not contain tRNA nucleotidyltransferase, valyl-tRNA synthetase or EF-1alpha. This suggests that interaction of TYMV RNA with EF-1alpha is not mandatory for replicase activity.

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