33 results found
    1. Microbiology and Infectious Disease

    A dedicated diribonucleotidase resolves a key bottleneck for the terminal step of RNA degradation

    Soo-Kyoung Kim et al.
    RNA degradation is completed through specific intermediates, such as diribonucleotides, which must be removed from the cells by a specific enzyme.
    1. Biochemistry and Chemical Biology
    2. Structural Biology and Molecular Biophysics

    Mechanisms of nucleotide selection by telomerase

    Matthew A Schaich et al.
    The roles of key telomerase active site residues were elucidated to determine how telomerase selects the correct from the incorrect nucleotide to maintain telomere integrity.
    1. Biochemistry and Chemical Biology
    2. Structural Biology and Molecular Biophysics

    3.3-Å resolution cryo-EM structure of human ribonucleotide reductase with substrate and allosteric regulators bound

    Edward J Brignole et al.
    Cryo-electron microscopy structures of human ribonucleotide reductase reveal molecular details of substrate selection and allosteric inhibition through assembly of its large subunit into a ring that excludes its small subunit.
    1. Biochemistry and Chemical Biology

    A reverse transcriptase ribozyme

    Biswajit Samanta, Gerald F Joyce
    An RNA enzyme is shown to function as a reverse transcriptase, an activity thought to be crucial for the transition from RNA to DNA genomes during the early history of life on Earth.
    1. Biochemistry and Chemical Biology
    2. Chromosomes and Gene Expression

    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. Structural Biology and Molecular Biophysics

    Molecular basis for allosteric specificity regulation in class Ia ribonucleotide reductase from Escherichia coli

    Christina M Zimanyi et al.
    Substrate and effector bound structures of a bacterial ribonucleotide reductase reveal the molecular basis by which substrate preference is modulated by a distal site on the enzyme.
    1. Biochemistry and Chemical Biology

    Non-enzymatic primer extension with strand displacement

    Lijun Zhou et al.
    Relying on RNA fragments derived from degradation or partial template copying, non-enzymatic primer extension with strand displacement offers a novel and prebiotically plausible approach to RNA self-replication.
    1. Biochemistry and Chemical Biology

    Crystallographic observation of nonenzymatic RNA primer extension

    Wen Zhang et al.
    Time resolved crystal structures reveal the binding of activated monomers to the template, followed by generation of the imidazolium-bridged dinucleotide intermediate, and finally formation of a phosphodiester bond between the primer and the adjacent monomer.
    1. Chromosomes and Gene Expression

    Translesion polymerase kappa-dependent DNA synthesis underlies replication fork recovery

    Peter Tonzi et al.
    Translesion polymerase kappa promotes replication fork restart to maintain genome stability during conditions of nucleotide deprivation.
    1. Chromosomes and Gene Expression
    2. Genetics and Genomics

    Universally high transcript error rates in bacteria

    Weiyi Li, Michael Lynch
    Fundamental details of the rate and molecular spectrum of transcript errors were revealed in four bacterial species, providing novel insights into transcriptional fidelity and RNA quality-control in prokaryotes.

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