5,283 results found
    1. Microbiology and Infectious Disease

    The alternative sigma factor σX mediates competence shut-off at the cell pole in Streptococcus pneumoniae

    Calum HG Johnston et al.
    Tracking fluorescent fusion proteins in competent pneumococcal cells reveals a polar hub for competence regulation, with the alternative sigma factor σX relocalizing DprA to this hub to mediate competence shut-off.
    1. Chromosomes and Gene Expression
    2. Microbiology and Infectious Disease

    The primary σ factor in Escherichia coli can access the transcription elongation complex from solution in vivo

    Seth R Goldman et al.
    The sigma subunit of bacterial RNA polymerase, classically known as an initiation factor, can also operate as an elongation factor with effects that vary with growth phase.
    1. Structural Biology and Molecular Biophysics

    Structural basis of transcription inhibition by the DNA mimic protein Ocr of bacteriophage T7

    Fuzhou Ye et al.
    DNA mimicry Ocr protein, a well-studied T7 phage protein that inhibits host restriction enzymes, can also inhibit host transcription through competing with sigma factors in binding to RNA polymerase.
    1. Evolutionary Biology
    2. Microbiology and Infectious Disease

    Asynchrony between virus diversity and antibody selection limits influenza virus evolution

    Dylan H Morris et al.
    Despite the virus' error prone polymerase, influenza virus antigenic evolution is rare, even in previously immune hosts, virus replication occurs before producing new antibodies.
    1. Biochemistry and Chemical Biology
    2. Structural Biology and Molecular Biophysics

    Structure and function of the mycobacterial transcription initiation complex with the essential regulator RbpA

    Elizabeth A Hubin et al.
    The essential mycobacterial transcription factor RbpA interacts with promoter DNA and cooperates with another essential transcription factor, CarD, to stimulate the formation of an intermediate leading to the open promoter complex.
    1. Biochemistry and Chemical Biology

    The ribosomal protein Asc1/RACK1 is required for efficient translation of short mRNAs

    Mary K Thompson et al.
    Asc1/RACK1 promotes the translation of mRNAs associated with the translational closed loop complex, which have short open reading frames and encode proteins required for core metabolic processes.
    1. Genetics and Genomics
    2. Microbiology and Infectious Disease

    An atlas of the binding specificities of transcription factors in Pseudomonas aeruginosa directs prediction of novel regulators in virulence

    Tingting Wang et al.
    The transcription factor (TF)-binding specificities of Pseudomonas aeruginosa allow us to predict virulence-associated TFs and their target genes, which will facilitate to find effective treatment and prevention for its associated diseases.
    1. Structural Biology and Molecular Biophysics

    Structures of two aptamers with differing ligand specificity reveal ruggedness in the functional landscape of RNA

    Andrew John Knappenberger et al.
    RNA aptamers that are closely related and share a common scaffold can readily adapt to recognize new ligands through changes in just a few nucleotides.
    1. Evolutionary Biology

    Geological and taphonomic context for the new hominin species Homo naledi from the Dinaledi Chamber, South Africa

    Paul HGM Dirks et al.
    A new hominin species found in a South African cave is part of one of the most unusual hominin fossil assemblages on record.
    1. Computational and Systems Biology
    2. Evolutionary Biology

    Expression noise facilitates the evolution of gene regulation

    Luise Wolf et al.
    In-lab evolution of synthetic promoters has revealed a novel general mechanism for de novo evolution of gene regulation, and highlights the crucial role of expression noise in this process.

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