Geminivirus Replication Protein Impairs SUMO Conjugation of Proliferating Cellular Nuclear Antigen at Two Acceptor Sites
Autor: | Miguel A. Sánchez-Durán, Harrold A. van den Burg, Manuel Arroyo-Mateos, Javier Ruiz-Albert, Marcel Prins, Tábata Rosas-Díaz, Francesca Maio, Blanca Sabarit, Ana P. Luna, Eduardo R. Bejarano |
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Rok vydání: | 2018 |
Předmět: |
0301 basic medicine
DNA repair Immunology SUMO protein Saccharomyces cerevisiae Biology Virus Replication Microbiology Viral Proteins 03 medical and health sciences chemistry.chemical_compound Solanum lycopersicum Ubiquitin Proliferating Cell Nuclear Antigen Virology Plant Proteins DNA replication Sumoylation Virus-Cell Interactions Proliferating cell nuclear antigen Cell biology Geminiviridae 030104 developmental biology chemistry Viral replication Insect Science biology.protein Homologous recombination DNA |
Zdroj: | Journal of Virology. 92 |
ISSN: | 1098-5514 0022-538X |
Popis: | Geminiviruses are DNA viruses that replicate in nuclei of infected plant cells using the plant DNA replication machinery, including PCNA (proliferating cellular nuclear antigen), a cofactor that orchestrates genome duplication and maintenance by recruiting crucial players to replication forks. These viruses encode a multifunctional protein, Rep, which is essential for viral replication, induces the accumulation of the host replication machinery, and interacts with several host proteins, including PCNA and the SUMO E2 conjugation enzyme (SCE1). Posttranslational modification of PCNA by ubiquitin or SUMO plays an essential role in the switching of PCNA between interacting partners during DNA metabolism processes (e.g., replication, recombination, and repair, etc.). In yeast, PCNA sumoylation has been associated with DNA repair involving homologous recombination (HR). Previously, we reported that ectopic Rep expression results in very specific changes in the sumoylation pattern of plant cells. In this work, we show, using a reconstituted sumoylation system in Escherichia coli, that tomato PCNA is sumoylated at two residues, K254 and K164, and that coexpression of the geminivirus protein Rep suppresses sumoylation at these lysines. Finally, we confirm that PCNA is sumoylated in planta and that Rep also interferes with PCNA sumoylation in plant cells. IMPORTANCE SUMO adducts have a key role in regulating the activity of animal and yeast PCNA on DNA repair and replication. Our work demonstrates for the first time that sumoylation of plant PCNA occurs in plant cells and that a plant virus interferes with this modification. This work marks the importance of sumoylation in allowing viral infection and replication in plants. Moreover, it constitutes a prime example of how viral proteins interfere with posttranslational modifications of selected host factors to create a proper environment for infection. |
Databáze: | OpenAIRE |
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