36 results found
    1. Biochemistry and Chemical Biology

    Evolution of (p)ppGpp-HPRT regulation through diversification of an allosteric oligomeric interaction

    Brent W Anderson et al.
    The signaling ligand (p)ppGpp regulates the enzyme HPRT across species by binding to a novel class of conserved motif, yet its specificity is allosterically altered through evolution of enzyme oligomerization.
    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. Microbiology and Infectious Disease

    Factors essential for L,D-transpeptidase-mediated peptidoglycan cross-linking and β-lactam resistance in Escherichia coli

    Jean-Emmanuel Hugonnet et al.
    Production of the L,D-transpeptidase YcbB and elevated synthesis of the (p)ppGpp alarmone reveals a new mode of peptidoglycan polymerization that bypasses the D,D-transpeptidase activity of PBPs and leads to broad-spectrum β-lactam resistance in Escherichia coli.
    1. Cell Biology
    2. Microbiology and Infectious Disease

    Bacterial cell cycle control by citrate synthase independent of enzymatic activity

    Matthieu Bergé et al.
    A key enzyme of central energy metabolism, citrate synthase, regulates bacterial cell cycle progression at a very specific stage (S-phase) and independently of its enzymatic activity.
    1. Microbiology and Infectious Disease

    NirD curtails the stringent response by inhibiting RelA activity in Escherichia coli

    Loïc Léger et al.
    Genetic and biochemical approaches uncover a novel mode of regulation of the alarmone synthetase RelA through a functional and direct interaction with the small subunit of the nitrite reductase NirD.
    1. Biochemistry and Chemical Biology
    2. Structural Biology and Molecular Biophysics

    E. coli TraR allosterically regulates transcription initiation by altering RNA polymerase conformation

    James Chen et al.
    Cryo-electron microscopy structures, combined with biochemical experiments, show how the E. coli F element-encoded TraR protein regulates transcription initiation by altering RNA polymerase conformation and conformational heterogeneity.
    1. Cell Biology
    2. Microbiology and Infectious Disease

    Reformulation of an extant ATPase active site to mimic ancestral GTPase activity reveals a nucleotide base requirement for function

    Taylor B Updegrove et al.
    Reengineering the nucleotide-binding pocket of an extant ATPase to restore ancestral GTPase activity revealed an ATP-dependent intermediate required for function and suggested why the protein evolved to use ATP.
    1. Microbiology and Infectious Disease

    Loss of N1-methylation of G37 in tRNA induces ribosome stalling and reprograms gene expression

    Isao Masuda et al.
    Biochemical and genome-wide analysis demonstrates that m1G37 is important for tRNA aminoacylation and for the entire elongation cycle of protein synthesis.
    1. Microbiology and Infectious Disease

    The Mla pathway in Acinetobacter baumannii has no demonstrable role in anterograde lipid transport

    Matthew J Powers et al.
    An outer membrane vesicle pulse-chase assay demonstrates that the Acinetobacter baumannii Mla system is a retrograde lipid transporter.
    1. Microbiology and Infectious Disease
    2. Structural Biology and Molecular Biophysics

    Structural ordering of the Plasmodium berghei circumsporozoite protein repeats by inhibitory antibody 3D11

    Iga Kucharska et al.
    A comprehensive structural analysis of inhibitory murine antibody 3D11 binding to Plasmodium berghei circumsporozoite protein reveals common mechanisms of antibody evolution in mammals against Plasmodium parasites.

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