NDLI: Function of the 30 kd protein of tobacco mosaic virus: involvement in cell-to-cell movement and dispensability for replication

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Function of the 30 kd protein of tobacco mosaic virus: involvement in cell-to-cell movement and dispensability for replication

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Function of the 30 kd protein of tobacco mosaic virus: involvement in cell-to-cell movement and dispensability for replication

Content Provider	PubMed Central
Author	Tetsuo, Meshi Watanabe, Yuichiro Saito, Tetsuichiro Sugimoto, Asako Maeda, Tatsuya Okada, Yoshimi
Abstract	We have investigated the function of the 30 kd protein of tobacco mosaic virus (TMV) by a reverse genetics approach. First, a point mutation of TMV Ls1 (a temperature-sensitive mutant defective in cell-to-cell movement), that causes an amino acid substitution in the 30 kd protein, was introduced into the parent strain, TMV L. The generated mutant showed the same phenotype as TMV Ls1, and therefore the one-base substitution in the 30 kd protein gene adequately explains the defectiveness of TMV Ls1. Next, four kinds of frame-shift mutants were constructed, whose mutations are located at three different positions of the 30 kd protein gene. All the frame-shift mutants were replication-competent in protoplasts but none showed infectivity on tobacco plants. From these observations the 30 kd protein was confirmed to be involved in cell-to-cell movement. To clarify that the 30 kd protein is not necessary for replication, two kinds of deletion mutants were constructed; one lacking most of the 30 kd protein gene and the other lacking both the 30 kd and coat protein genes. Both mutants replicated in protoplasts and the former still produced the subgenomic mRNA for the coat protein. These results clearly showed that the 30 kd protein, as well as the coat protein, is dispensable for replication and that no cis-acting element for replication is located in their coding sequences. It is also suggested that the signal for coat protein mRNA synthesis may be located within about 100 nucleotides upstream of the initiation codon of the coat protein gene.
Starting Page	2557
File Format	PDF
ISSN	14602075
e-ISSN	14602075
Journal	The EMBO Journal
Issue Number	9
Volume Number	6
Language	English
Publisher Date	1987-09-01
Access Restriction	Open
Subject Keyword	Research in Higher Education
Content Type	Text
Resource Type	Article
Subject	Neuroscience Immunology and Microbiology Medicine Molecular Biology

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