26 results found
    1. Biochemistry and Chemical Biology
    2. Structural Biology and Molecular Biophysics

    The Cas4-Cas1-Cas2 complex mediates precise prespacer processing during CRISPR adaptation

    Hayun Lee et al.
    During CRISPR adaptation, Cas4 forms a ternary complex with the Cas1-Cas2 spacer integration complex, an interaction that coordinates substrate hand-off following precise, PAM-dependent prespacer processing prior to integration.
    1. Biochemistry and Chemical Biology

    Intrinsic sequence specificity of the Cas1 integrase directs new spacer acquisition

    Clare Rollie et al.
    The acquisition of new foreign DNA by the prokaryotic adaptive immune system CRISPR-Cas is shown to depend on the fundamental sequence specificity of the Cas1 integrase.
    1. Structural Biology and Molecular Biophysics

    Casposase structure and the mechanistic link between DNA transposition and spacer acquisition by CRISPR-Cas

    Alison B Hickman et al.
    The tetrameric structure of a casposase bound to DNA and its biochemical properties show how a transposase could have evolved to perform CRISPR-Cas spacer acquisition.
    1. Microbiology and Infectious Disease

    Type III CRISPR-Cas systems can provide redundancy to counteract viral escape from type I systems

    Sukrit Silas et al.
    Cooperation between evolutionarily disparate CRISPR-Cas modules allows bacteria to counter mutational escape by viruses.
    1. Biochemistry and Chemical Biology

    Control of cyclic oligoadenylate synthesis in a type III CRISPR system

    Christophe Rouillon et al.
    Generation of the anti-viral second messenger cyclic oligoadenylate by type III CRISPR systems is tightly controlled in response to viral RNA load and sequence.
    1. Microbiology and Infectious Disease

    A type III-A CRISPR-Cas system employs degradosome nucleases to ensure robust immunity

    Lucy Chou-Zheng, Asma Hatoum-Aslan
    Degradosome-associated nucleases PNPase and RNase J2 are required for type III CRISPR immunity against diverse nucleic acid invaders originating from plasmid and phage.
    1. Biochemistry and Chemical Biology

    Disintegration promotes protospacer integration by the Cas1-Cas2 complex

    Chien-Hui Ma et al.
    Disintegration, regarded as an abortive side reaction antithetical to DNA transposition, can promote protospacer integration at the CRISPR locus via DNA repair pathways.
    1. Biochemistry and Chemical Biology

    Tetramerisation of the CRISPR ring nuclease Crn3/Csx3 facilitates cyclic oligoadenylate cleavage

    Januka S Athukoralage et al.
    A widespread ribonuclease is a CRISPR-associated ring nuclease with a highly unusual cooperative mechanism involving tetramerisation of the enzyme.
    1. Biochemistry and Chemical Biology

    CRISPR-Cas12a exploits R-loop asymmetry to form double-strand breaks

    Joshua C Cofsky et al.
    The DNA flanks on either side of an R-loop differ in stability, and CRISPR-Cas12 enzymes form double-strand breaks by targeting the more unstable flank with their single DNase active site.
    1. Microbiology and Infectious Disease

    Dominant Vibrio cholerae phage exhibits lysis inhibition sensitive to disruption by a defensive phage satellite

    Stephanie G Hays, Kimberley D Seed
    Genetic and molecular analyses identify and characterize an evolutionary battle over lysis timing wherein a bacteriophage delays lysis through lysis inhibition while a defensive phage satellite accelerates lysis.

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