Genetic control of replication through N1-methyladenine in human cells

Juan Conde, Jung Hoon Yoon, Jayati Roy Choudhury, Louise Prakash, Satya Prakash

    Research output: Contribution to journalArticle

    6 Citations (Scopus)

    Abstract

    N1-methyl adenine (1-MeA) is formed in DNA by reaction with alkylating agents and naturally occurring methyl halides. The 1-MeA lesion impairs Watson-Crick base pairing and blocks normal DNA replication. Here we identify the translesion synthesis (TLS) DNA polymerases (Pols) required for replicating through 1-MeA in human cells and show that TLS through this lesion is mediated via three different pathways in which Pols ι and θ function in one pathway and Pols η and ζ, respectively, function in the other two pathways. Our biochemical studies indicate that in the Polι/Polθ pathway, Polι would carry out nucleotide insertion opposite 1-MeA from which Polθ would extend synthesis. In the Polη pathway, this Pol alone would function at both the nucleotide insertion and extension steps of TLS, and in the third pathway, Polζ would extend from the nucleotide inserted opposite 1-MeA by an as yet unidentified Pol. Whereas by pushing 1-MeA into the syn conformation and by forming Hoogsteen base pair with the T residue, Polι would carry out TLS opposite 1-MeA, the ability of Polη to replicate through 1-MeA suggests that despite its need for Watson- Crick hydrogen bonding, Polη can stabilize the adduct in its active site. Remarkably, even though Pols η and ι are quite error-prone at inserting nucleotides opposite 1-MeA, TLS opposite this lesion in human cells occurs in a highly error-free fashion. This suggests that the in vivo fidelity of TLS Pols is regulated by factors such as post-translational modifications, protein-protein interactions, and possibly others.

    Original languageEnglish (US)
    Pages (from-to)29794-29800
    Number of pages7
    JournalJournal of Biological Chemistry
    Volume290
    Issue number50
    DOIs
    StatePublished - Dec 11 2015

    Fingerprint

    Nucleotides
    Cells
    Base Pairing
    Alkylating Agents
    Adenine
    DNA-Directed DNA Polymerase
    Hydrogen Bonding
    Post Translational Protein Processing
    DNA Replication
    Catalytic Domain
    DNA
    Conformations
    Hydrogen bonds
    Proteins

    ASJC Scopus subject areas

    • Biochemistry
    • Cell Biology
    • Molecular Biology

    Cite this

    Genetic control of replication through N1-methyladenine in human cells. / Conde, Juan; Yoon, Jung Hoon; Choudhury, Jayati Roy; Prakash, Louise; Prakash, Satya.

    In: Journal of Biological Chemistry, Vol. 290, No. 50, 11.12.2015, p. 29794-29800.

    Research output: Contribution to journalArticle

    Conde, Juan ; Yoon, Jung Hoon ; Choudhury, Jayati Roy ; Prakash, Louise ; Prakash, Satya. / Genetic control of replication through N1-methyladenine in human cells. In: Journal of Biological Chemistry. 2015 ; Vol. 290, No. 50. pp. 29794-29800.
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