Abstract:
:Members of the Geminiviridae have single-stranded DNA genomes that replicate in nuclei of infected plant cells. All geminiviruses encode a conserved protein (Rep) that catalyzes initiation of rolling-circle replication. Earlier studies showed that three conserved motifs-motifs I, II, and III-in the N termini of geminivirus Rep proteins are essential for function. In this study, we identified a fourth sequence, designated GRS (geminivirus Rep sequence), in the Rep N terminus that displays high amino acid sequence conservation across all geminivirus genera. Using the Rep protein of Tomato golden mosaic virus (TGMV AL1), we show that GRS mutants are not infectious in plants and do not support viral genome replication in tobacco protoplasts. GRS mutants are competent for protein-protein interactions and for both double- and single-stranded DNA binding, indicating that the mutations did not impair its global conformation. In contrast, GRS mutants are unable to specifically cleave single-stranded DNA, which is required to initiate rolling-circle replication. Interestingly, the Rep proteins of phytoplasmal and algal plasmids also contain GRS-related sequences. Modeling of the TGMV AL1 N terminus suggested that GRS mutations alter the relative positioning of motif II, which coordinates metal ions, and motif III, which contains the tyrosine involved in DNA cleavage. Together, these results established that the GRS is a conserved, essential motif characteristic of an ancient lineage of rolling-circle initiators and support the idea that geminiviruses may have evolved from plasmids associated with phytoplasma or algae.
journal_name
J Viroljournal_title
Journal of virologyauthors
Nash TE,Dallas MB,Reyes MI,Buhrman GK,Ascencio-Ibañez JT,Hanley-Bowdoin Ldoi
10.1128/JVI.02143-10subject
Has Abstractpub_date
2011-02-01 00:00:00pages
1182-92issue
3eissn
0022-538Xissn
1098-5514pii
JVI.02143-10journal_volume
85pub_type
杂志文章abstract::Homologous recombination is an important biological process that facilitates genome rearrangement and repair of DNA double-strand breaks (DSBs). The induction of Epstein-Barr virus (EBV) lytic replication induces ataxia telangiectasia-mutated (ATM)-dependent DNA damage checkpoint signaling, leading to the clustering o...
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pub_type: 杂志文章
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pub_type: 杂志文章
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journal_title:Journal of virology
pub_type: 杂志文章
doi:10.1128/JVI.68.4.2161-2168.1994
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journal_title:Journal of virology
pub_type: 杂志文章
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pub_type: 杂志文章
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更新日期:1993-04-01 00:00:00
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pub_type: 杂志文章
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journal_title:Journal of virology
pub_type: 杂志文章
doi:10.1128/JVI.19.3.810-819.1976
更新日期:1976-09-01 00:00:00
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journal_title:Journal of virology
pub_type: 杂志文章
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journal_title:Journal of virology
pub_type: 杂志文章
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pub_type: 杂志文章
doi:10.1128/JVI.13.1.125-139.1974
更新日期:1974-01-01 00:00:00
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journal_title:Journal of virology
pub_type: 杂志文章
doi:10.1128/JVI.69.2.1253-1255.1995
更新日期:1995-02-01 00:00:00
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journal_title:Journal of virology
pub_type: 杂志文章
doi:10.1128/JVI.68.11.7546-7548.1994
更新日期:1994-11-01 00:00:00
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journal_title:Journal of virology
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journal_title:Journal of virology
pub_type: 杂志文章
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更新日期:2002-12-01 00:00:00
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更新日期:2016-07-27 00:00:00
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pub_type: 杂志文章
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journal_title:Journal of virology
pub_type: 杂志文章
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journal_title:Journal of virology
pub_type: 杂志文章
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更新日期:2017-09-27 00:00:00
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journal_title:Journal of virology
pub_type: 杂志文章
doi:10.1128/JVI.19.1.61-81.1976
更新日期:1976-07-01 00:00:00
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journal_title:Journal of virology
pub_type: 杂志文章
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更新日期:2012-06-01 00:00:00
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journal_title:Journal of virology
pub_type: 杂志文章
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更新日期:2009-01-01 00:00:00
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journal_title:Journal of virology
pub_type: 杂志文章
doi:10.1128/JVI.02025-19
更新日期:2020-06-16 00:00:00
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journal_title:Journal of virology
pub_type: 杂志文章
doi:10.1128/JVI.03301-13
更新日期:2014-03-01 00:00:00
abstract::The synthesis of minus-strand RNA was studied in cell cultures infected with the heat-resistant strain of Sindbis virus and with temperature-sensitive (ts) belonging to complementation groups A, B, F, and G, all of which exhibited an RNA-negative (RNA-) phenotype when infection was initiated and maintained at 39 degre...
journal_title:Journal of virology
pub_type: 杂志文章
doi:10.1128/JVI.39.2.348-358.1981
更新日期:1981-08-01 00:00:00