2,533 results found
    1. Biochemistry and Chemical Biology

    Extensive site-directed mutagenesis reveals interconnected functional units in the alkaline phosphatase active site

    Fanny Sunden et al.
    Conventional studies have focused on enzymatic residues directly involved in catalysis; dissecting a potential interaction network within which these ‘catalytic residues’ are embedded provides insights fundamental to enzyme function, evolution, and engineering.
    1. Computational and Systems Biology

    Design principles of autocatalytic cycles constrain enzyme kinetics and force low substrate saturation at flux branch points

    Uri Barenholz et al.
    The stability of metabolic autocatalytic cycles that are widespread in central metabolism limits the affinities of enzymes at flux branch points and explains excess expression of these enzymes.
    1. Structural Biology and Molecular Biophysics
    2. Microbiology and Infectious Disease

    A structural mechanism for bacterial autotransporter glycosylation by a dodecameric heptosyltransferase family

    Qing Yao et al.
    Protein heptosyltransferases modify a group of bacterial autotransporters for virulence function and employ a novel structural mechanism for the processive hyperglycosylation of the autotransporter.
    1. Chromosomes and Gene Expression

    General decapping activators target different subsets of inefficiently translated mRNAs

    Feng He et al.
    Dhh1, Pat1, and Lsm1 target subsets of cellular mRNAs for decapping via interactions of these regulatory proteins with the C-terminal domain of Dcp2, the catalytic component of the decapping enzyme.
    1. Biochemistry and Chemical Biology
    2. Structural Biology and Molecular Biophysics

    Relief of autoinhibition by conformational switch explains enzyme activation by a catalytically dead paralog

    Oleg A Volkov et al.
    A catalytically dead paralog activates its cognate enzyme through an allosteric mechanism that combined structural and phylogenomic analysis indicates arose through acquisition of a dimerization domain, suggesting a general model for how complex allostery evolves.
    1. Biochemistry and Chemical Biology
    2. Structural Biology and Molecular Biophysics

    Redox-dependent rearrangements of the NiFeS cluster of carbon monoxide dehydrogenase

    Elizabeth C Wittenborn et al.
    Structural analysis reveals large-scale conformational changes in the active site metallocluster of a CO2-fixing enzyme.
    1. Structural Biology and Molecular Biophysics
    2. Chromosomes and Gene Expression

    Single-molecule imaging of telomerase reverse transcriptase in human telomerase holoenzyme and minimal RNP complexes

    Robert Alexander Wu et al.
    New labeling approaches for single-molecule fluorescence microscopy detect the monomeric catalytic subunit of human telomerase within cellular holoenzyme and minimal active recombinant enzyme.
    1. Cell Biology

    A bioactive peptide amidating enzyme is required for ciliogenesis

    Dhivya Kumar et al.
    Analysis of Chlamydomonas, planaria and mice reveals a novel and unanticipated role for a peptide amidating enzyme in primary and motile ciliary assembly through effects on post-Golgi trafficking.
    1. Biochemistry and Chemical Biology
    2. Structural Biology and Molecular Biophysics

    Cooperative base pair melting by helicase and polymerase positioned one nucleotide from each other

    Divya Nandakumar et al.
    A detailed model of the T7 replisome with the precise positions of the helicase and polymerase at the replication fork explains how catalysis by the two enzymes is coordinated.
    1. Biochemistry and Chemical Biology
    2. Genetics and Genomics

    Evolution of substrate specificity in a retained enzyme driven by gene loss

    Ana Lilia Juárez-Vázquez et al.
    An integrated biochemical and evolutionary analysis shows how enzyme specificity evolves after gene loss during genome decay, implicating relaxation of purifying selection as a driving force for functional divergence.

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