Structure of a high fidelity DNA polymerase bound to a benzo[a]pyrene adduct that blocks replication

Gerald W. Hsu, Xuanwei Huang, Natalia P. Luneva, Nicholas Geacintov, Lorena S. Beese

Research output: Contribution to journalArticle

Abstract

Of the carcinogens to which humans are most frequently exposed, the polycyclic aromatic hydrocarbon benzo[a]pyrene (BP) is one of the most ubiquitous. BP is a byproduct of grilled foods and tobacco and fuel combustion and has long been linked to various human cancers, particularly lung and skin. BP is metabolized to diol epoxides that covalently modify DNA bases to form bulky adducts that block DNA synthesis by replicative or high fidelity DNA polymerases. Here we present the structure of a high fidelity polymerase from a thermostable strain of Bacillus stearothermophilus (Bacillus fragment) bound to the most common BP-derived N2-guanine adduct base-paired with cytosine. The BP adduct adopts a conformation that places the polycyclic BP moiety in the nascent DNA minor groove and is the first structure of a minor groove adduct bound to a polymerase. Orientation of the BP moiety into the nascent DNA minor groove results in extensive disruption to the interactions between the adducted DNA duplex and the polymerase. The disruptions revealed by the structure of Bacillus fragment bound to a BP adduct provide a molecular basis for rationalizing the potent blocking effect on replication exerted by BP adducts.

Original languageEnglish (US)
Pages (from-to)3764-3770
Number of pages7
JournalJournal of Biological Chemistry
Volume280
Issue number5
DOIs
StatePublished - Feb 4 2005

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Benzo(a)pyrene
DNA-Directed DNA Polymerase
Bacilli
Bacillus
DNA
Geobacillus stearothermophilus
DNA Adducts
Cytosine
Polycyclic Aromatic Hydrocarbons
Epoxy Compounds
Guanine
Skin Neoplasms
Carcinogens
Tobacco
Lung Neoplasms
Food
Byproducts
Conformations
Skin

ASJC Scopus subject areas

  • Biochemistry

Cite this

Structure of a high fidelity DNA polymerase bound to a benzo[a]pyrene adduct that blocks replication. / Hsu, Gerald W.; Huang, Xuanwei; Luneva, Natalia P.; Geacintov, Nicholas; Beese, Lorena S.

In: Journal of Biological Chemistry, Vol. 280, No. 5, 04.02.2005, p. 3764-3770.

Research output: Contribution to journalArticle

Hsu, Gerald W. ; Huang, Xuanwei ; Luneva, Natalia P. ; Geacintov, Nicholas ; Beese, Lorena S. / Structure of a high fidelity DNA polymerase bound to a benzo[a]pyrene adduct that blocks replication. In: Journal of Biological Chemistry. 2005 ; Vol. 280, No. 5. pp. 3764-3770.
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