1,044 results found
    1. Biochemistry and Chemical Biology

    Stepwise assembly of the human replicative polymerase holoenzyme

    Mark Hedglin et al.
    Fluorescence resonance energy transfer has been used to explore the interactions between DNA polymerases, sliding clamps and clamp loaders as DNA is replicated in human cells.
    1. Biochemistry and Chemical Biology
    2. Biophysics and Structural Biology

    Structural basis of transcription arrest by coliphage HK022 Nun in an Escherichia coli RNA polymerase elongation complex

    Jin Young Kang et al.
    Cryo-electron microscopy structures show how coliphage HK022 Nun blocks Escherichia coli RNA polymerase translocation by mediating multiple interactions between the RNA polymerase and nucleic acids.
    1. Biophysics and Structural Biology
    2. Genes and Chromosomes

    A novel SH2 recognition mechanism recruits Spt6 to the doubly phosphorylated RNA polymerase II linker at sites of transcription

    Matthew A Sdano et al.
    The tandem SH2 domains of Spt6 use novel mechanisms to bind unexpected phosphorylated serine and threonine residues in the RNA polymerase II linker to recruit Spt6 to sites of transcription and maintain repressive chromatin.
    1. Genes and Chromosomes

    The nucleosomal barrier to promoter escape by RNA polymerase II is overcome by the chromatin remodeler Chd1

    Peter J Skene et al.
    The ATP-dependent chromatin remodeler Chd1 controls nucleosome turnover to allow RNA Polymerase to transcribe in vivo.
    1. Biochemistry and Chemical Biology
    2. Genes and Chromosomes

    Polymerase θ is a robust terminal transferase that oscillates between three different mechanisms during end-joining

    Tatiana Kent et al.
    Polymerase θ is among the most proficient terminal transferases known and switches between three different mechanisms of terminal transferase activity.
    1. Biochemistry and Chemical Biology
    2. Microbiology and Infectious Disease

    GE23077 binds to the RNA polymerase ‘i’ and ‘i+1’ sites and prevents the binding of initiating nucleotides

    Yu Zhang et al.
    The cyclic-peptide antibiotic GE23077 inhibits bacterial RNA polymerase through a novel target that exhibits low susceptibility to target-based resistance and that enables synthesis of bipartite inhibitors that are exceptionally potent and refractory to target-based resistance.
    1. Biochemistry and Chemical Biology

    DNA polymerase V activity is autoregulated by a novel intrinsic DNA-dependent ATPase

    Aysen L Erdem et al.
    DNA synthesis by DNA polymerase V is regulated by an intrinsic DNA-dependent ATPase activity which has not been observed for any other polymerase.
    1. Biochemistry and Chemical Biology
    2. Biophysics and Structural Biology

    Structure of a bacterial RNA polymerase holoenzyme open promoter complex

    Brian Bae et al.
    The crystal structure of bacterial RNA polymerase bound to the transcription bubble reveals key features that support the formation of a double-strand/single-strand DNA junction at the upstream edge of the −10 element where bubble formation initiates.
    1. Biophysics and Structural Biology

    Structural mechanism of ATP-independent transcription initiation by RNA polymerase I

    Yan Han et al.
    Structures of RNA polymerase I transcription machinery revealed a ratcheting motion within the complex in coordination with three distinct functional states, implicating a novel mechanism for promoter bubble opening in the absence of ATP hydrolysis.
    1. Biophysics and Structural Biology

    Single-molecule visualization of fast polymerase turnover in the bacterial replisome

    Jacob S Lewis et al.
    The canonical model that the bacterial replisome tightly holds on to its polymerases is challenged by the visualization of rapid holoenzyme exchange, both in vitro and in vivo.

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