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

    Analysis of the crystal structure of an active MCM hexamer

    Justin M Miller et al.
    Building on previous work (Froelich et al., 2014), we present the X-ray crystal structure of an active MCM hexamer, which suggests a mechanism for MCM regulation and demonstrates a key interaction between the major domains.
    1. Biochemistry and Chemical Biology
    2. Structural Biology and Molecular Biophysics

    DNA binding polarity, dimerization, and ATPase ring remodeling in the CMG helicase of the eukaryotic replisome

    Alessandro Costa et al.
    The Mcm2-7 motor unwinds DNA using an approach distinct from that of superfamily III helicases, and accesses multiple ring configurations and assembly states during the initiation of DNA replication.
    1. Biochemistry and Chemical Biology

    The dynamic interplay of host and viral enzymes in type III CRISPR-mediated cyclic nucleotide signalling

    Januka S Athukoralage et al.
    The dynamic interplay between type III CRISPR enzymes governs cyclic nucleotide levels and infection outcomes in virus-host conflict.
    1. Biochemistry and Chemical Biology

    Amidst multiple binding orientations on fork DNA, Saccharolobus MCM helicase proceeds N-first for unwinding

    Himasha M Perera, Michael A Trakselis
    The archaeal MCM helicase can load in multiple orientations on DNA but translocation proceeds with a leading N-terminal domain, which affects double hexamer activation at origins of replication.
    1. Structural Biology and Molecular Biophysics
    2. Evolutionary Biology

    Large-scale determination of previously unsolved protein structures using evolutionary information

    Sergey Ovchinnikov et al.
    A new method of protein structure prediction that incorporates residue–residue co-evolution information into the Rosetta structure prediction program was used to develop models for 58 large protein families that had no previous structural information.
    1. Evolutionary Biology

    Robust and accurate prediction of residue–residue interactions across protein interfaces using evolutionary information

    Sergey Ovchinnikov et al.
    Co-evolving residue pairs in the different components of a protein complex almost always make contact across the protein–protein interface, thus providing powerful restraints for the modeling of protein complexes.
    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. 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. Computational and Systems Biology
    2. Structural Biology and Molecular Biophysics

    Investigating the trade-off between folding and function in a multidomain Y-family DNA polymerase

    Xiakun Chu et al.
    The physical interaction network encoded in the multi-domain protein native structure handles the trade-off between the fast, stable folding and the efficient, reliable function.
    1. Biochemistry and Chemical Biology
    2. Structural Biology and Molecular Biophysics

    The guide sRNA sequence determines the activity level of box C/D RNPs

    Andrea Graziadei et al.
    Integrative structural biology reveals a conformational equilibrium in the Box C/D methylation enzyme that regulates the extent of site-specific 2'-O-rRNA methylation in dependence of the RNA sequence.

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