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Gap-directed translesion DNA synthesis of an abasic site on circular DNA templates by a human replication complex.

التفاصيل البيبلوغرافية
العنوان: Gap-directed translesion DNA synthesis of an abasic site on circular DNA templates by a human replication complex.
المؤلفون: Giuseppe Villani, Igor Shevelev, Eleonora Orlando, Helmut Pospiech, Juhani E Syvaoja, Enni Markkanen, Ulrich Hubscher, Nicolas Tanguy Le Gac
المصدر: PLoS ONE, Vol 9, Iss 4, p e93908 (2014)
بيانات النشر: Public Library of Science (PLoS), 2014.
سنة النشر: 2014
المجموعة: LCC:Medicine
LCC:Science
مصطلحات موضوعية: Medicine, Science
الوصف: DNA polymerase ε (pol ε) is believed to be the leading strand replicase in eukaryotes whereas pols λ and β are thought to be mainly involved in re-synthesis steps of DNA repair. DNA elongation by the human pol ε is halted by an abasic site (apurinic/apyrimidinic (AP) site). We have previously reported that human pols λ, β and η can perform translesion synthesis (TLS) of an AP site in the presence of pol ε. In the case of pol λ and β, this TLS requires the presence of a gap downstream from the product synthetized by the ε replicase. However, since these studies were conducted exclusively with a linear DNA template, we decided to test whether the structure of the template could influence the capacity of the pols ε, λ, β and η to perform TLS of an AP site. Therefore, we have investigated the replication of damaged "minicircle" DNA templates. In addition, replication of circular DNA requires, beyond DNA pols, the processivity clamp PCNA, the clamp loader replication factor C (RFC), and the accessory proteins replication protein A (RPA). Finally we have compared the capacity of unmodified versus monoubiquitinated PCNA in sustaining TLS by pols λ and η on a circular template. Our results indicate that in vitro gap-directed TLS synthesis by pols λ and β in the presence of pol ε, RPA and PCNA is unaffected by the structure of the DNA template. Moreover, monoubiquitination of PCNA does not affect TLS by pol λ while it appears to slightly stimulate TLS by pol η.
نوع الوثيقة: article
وصف الملف: electronic resource
اللغة: English
تدمد: 1932-6203
Relation: http://europepmc.org/articles/PMC3977967?pdf=render; https://doaj.org/toc/1932-6203
DOI: 10.1371/journal.pone.0093908
URL الوصول: https://doaj.org/article/7b559f9d552e47b6b5eda7eab0621523
رقم الأكسشن: edsdoj.7b559f9d552e47b6b5eda7eab0621523
قاعدة البيانات: Directory of Open Access Journals
الوصف
تدمد:19326203
DOI:10.1371/journal.pone.0093908