Al1-dependent Repression of Transcription Enhances Expression of Tomato Golden Mosaic Virus Al2 and Al3.
From: Department of Biology, The University of Texas at San Antonio, One UTSA Circle, San Antonio, TX 78249, USA.
Virology
- Publish Date: Jul 2007
- ISSN: 0042-6822
- Volume: 364
- Issue: 1
- Pages: 112-22
- Medium: Print
- Language: English
- Citation (JAMA): Shung Chia-Yi, Sunter Garry, et al. Al1-dependent Repression of Transcription Enhances Expression of Tomato Golden Mosaic Virus Al2 and Al3.. Virology Jul 2007;364:112-22
Abstract
Studies using Nicotiana benthamiana protoplasts have determined that repression of upstream transcription by AL1 protein enhances AL2 and AL3 expression in Tomato golden mosaic virus (TGMV). Mutations resulting in the inability of TGMV AL1 protein to associate with its cognate binding site, result in a decrease in both AL2 and AL3 expression. Reduced expression correlates with an increase in transcription from the AL62 start site, and decreased transcription from downstream initiation sites (AL1935 and AL1629) present within the AL1 coding region. The results demonstrate that, in a tobacco protoplast system, repression of AL62 transcription, regulated through binding of AL1 protein to sequences in the origin of replication, is required prior to AL2 and AL3 gene expression from the AL1935 and AL1629 viral transcripts. This provides a mechanism to regulate expression of AL2, which is involved in suppression of host defense responses and is required for late gene expression.
Mesh Headings (Keywords): Base Sequence, Begomovirus, Binding Sites, DNA Primers, DNA, Viral, Gene Expression, Genes, Viral, Lycopersicon esculentum, Promoter Regions (Genetics), Protoplasts, RNA, Viral, Repressor Proteins, Tobacco, Transfection, Viral Proteins
Check for Full Text / PubMed Unique Identifier (PMID): 17407785
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