685 results found
    1. Evolutionary Biology

    RNA chaperones buffer deleterious mutations in E. coli

    Marina Rudan et al.
    The overexpression of RNA chaperones, including several DEAD box RNA helicases, enhances the fitness of mutationally compromised E. coli strains.
    1. Cell Biology

    Cytosolic Hsp70 and co-chaperones constitute a novel system for tRNA import into the nucleus

    Akira Takano et al.
    A major cytoplasmic chaperone, Ssa2p, acts as a nuclear import carrier for tRNAs upon nutrient starvation in Saccharomyces cerevisiae.
    1. Structural Biology and Molecular Biophysics

    Acidic C-terminal domains autoregulate the RNA chaperone Hfq

    Andrew Santiago-Frangos et al.
    Modeling and biophysics show that the unstructured acidic tail of the Sm protein Hfq mimics nucleic acid to auto inhibit its chaperone activity, preventing Hfq from being sequestered by inauthentic substrates and providing insight into the evolution of Hfq's chaperone function among bacterial genera.
    1. Biochemistry and Chemical Biology
    2. Microbiology and Infectious Disease

    Dynamic interactions between the RNA chaperone Hfq, small regulatory RNAs, and mRNAs in live bacterial cells

    Seongjin Park et al.
    RNA chaperone Hfq dynamically binds various pools of cellular RNAs to execute different regulatory functions.
    1. Biochemistry and Chemical Biology
    2. Structural Biology and Molecular Biophysics

    DNA-mediated association of two histone-bound complexes of yeast Chromatin Assembly Factor-1 (CAF-1) drives tetrasome assembly in the wake of DNA replication

    Francesca Mattiroli et al.
    After DNA replication, nucleosomes are assembled by two histone chaperone complexes each bound to an H3-H4 histone dimer, suggesting the feasibility for a semi-conservative mode of epigenome inheritance.
    1. Structural Biology and Molecular Biophysics

    Importin-9 wraps around the H2A-H2B core to act as nuclear importer and histone chaperone

    Abhilash Padavannil et al.
    In an unusual complex that is not dissociated by RanGTP alone, Importin-9 sequesters the H2A-H2B core from promiscuous interactions.
    1. Biochemistry and Chemical Biology
    2. Chromosomes and Gene Expression

    FACT and Ubp10 collaborate to modulate H2B deubiquitination and nucleosome dynamics

    Melesse Nune et al.
    The histone chaperone FACT and the deubiquitinating enzyme Ubp10 act in concert to remove ubiquitin from histone H2B in nucleosomes, and likely coordinate nucleosome assembly during DNA replication and transcription.
    1. Biochemistry and Chemical Biology
    2. Structural Biology and Molecular Biophysics

    Insights into the molecular architecture and histone H3-H4 deposition mechanism of yeast Chromatin assembly factor 1

    Paul Victor Sauer et al.
    The CAF1 complex binds single histone H3-H4 dimers, and two such complexes associate with extended DNA elements to ensure the deposition of H3-H4 tetramers, the first step in the assembly of nucleosomes.
    1. Neuroscience

    A long non-coding RNA is required for targeting centromeric protein A to the human centromere

    Delphine Quénet, Yamini Dalal
    A non-coding RNA-based targeting mechanism could potentially epigenetically maintain specialized chromatin structures, such as the centromere, in vivo.
    1. Chromosomes and Gene Expression

    Nucleosome disassembly during human non-homologous end joining followed by concerted HIRA- and CAF-1-dependent reassembly

    Xuan Li, Jessica K Tyler
    The human genome is unpackaged to allow DNA breaks to be joined back together, and then repackaged into chromosomes afterwards.

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