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PMID: 3405758 Published · ppublish English Journal Article Research Support, Non-U.S. Gov't Research Support, U.S. Gov't, Non-P.H.S.

Genetic analysis of the tomato golden mosaic virus. II. The product of the AL1 coding sequence is required for replication.

Nucleic acids research ·Vol. 16 ·No. 14B ·1988-07-25 ·Pages 7043-60

Elmer JS, Brand L, Sunter G, Gardiner WE, Bisaro DM, Rogers SG

Abstract

Tomato golden mosaic virus (TGMV) belongs to the geminivirus subgroup that is characterized by a split genome consisting of two single-stranded circular DNAs. The TGMV A genome component encodes the virus coat protein as well as all of the functions necessary for viral DNA replication. Analysis of the nucleotide sequence indicates that the TGMV A component has, in addition to the coat protein encoding ORF, four overlapping open reading frames (ORFs) with the potential to encode proteins of greater than 10 kD. We have investigated the functions of these putative proteins in both symptom formation and DNA replication by creating mutations in each of the ORFs. Our results show that the AL4 ORF, which is encoded within the N-terminal region of ORF AL1, is not essential for normal virus infection. In contrast, we find that disruption of the AL3 ORF results in delay and attenuation of symptom formation. We also report that the products of the AL1 and AL2 ORFs are absolutely required for symptom formation. Studies of DNA replication show that only the AL1 open reading frame is essential for viral DNA synthesis. The significance of these results for the development of vectors from the geminiviruses is discussed.

MeSH Terms
DNA Mutational Analysis DNA Replication DNA, Viral/genetics Genes, Viral Genetic Complementation Test Mosaic Viruses/genetics Plant Diseases Viral Proteins/genetics Virus Replication
Chemicals
DNA, Viral Viral Proteins
Authors & Affiliations
6 authors, click to expand affiliations / ORCID
Elmer J S
Plant Molecular Biology, Monsanto Company, St Louis, MO 63198.
Brand L
Sunter G
Gardiner W E
Bisaro D M
Rogers S G
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Article Info
Journal
Nucleic acids research
Abbr.
Nucleic Acids Res
ISSN
0305-1048
DOI
10.1093/nar/16.14.7043
Published
1988-07-25
Pages
7043-60
Language
English
Region
England
NLM ID
0411011
PMCID
PMC338350
Subset
IM
External Links
PubMed source DOI: 10.1093/nar/16.14.7043 PMC Full Text View journal details
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