286 results found
    1. Biochemistry and Chemical Biology
    2. Structural Biology and Molecular Biophysics

    Two-way communication between SecY and SecA suggests a Brownian ratchet mechanism for protein translocation

    William John Allen et al.
    Evidence is presented that supports a completely new, diffusion-driven mechanism for transporting proteins across membranes in bacteria.
    1. Biochemistry and Chemical Biology
    2. Physics of Living Systems

    Direct measurement of the mechanical work during translocation by the ribosome

    Tingting Liu et al.
    ‘Optical tweezers’ measurements of single ribosomes and single mRNA molecules show that the translation rate depends exponentially on the applied force, and suggests that the ribosome functions as a Brownian ratchet.
    1. Microbiology and Infectious Disease
    2. Physics of Living Systems

    Influenza A virus surface proteins are organized to help penetrate host mucus

    Michael D Vahey, Daniel A Fletcher
    By distributing receptor-binding and receptor-destroying proteins asymmetrically on their surface, filamentous influenza A virus particles create a Brownian ratchet that facilitates their passage through mucus.
    1. Structural Biology and Molecular Biophysics

    Complete dissection of transcription elongation reveals slow translocation of RNA polymerase II in a linear ratchet mechanism

    Manchuta Dangkulwanich et al.
    Quantification of all the major on- and off-pathway kinetic parameters in the transcription elongation cycle reveals that RNA polymerase II translocates slowly in a linear, non-branched Brownian ratchet mechanism.
    1. Biochemistry and Chemical Biology
    2. Structural Biology and Molecular Biophysics

    Structure and conformational states of the bovine mitochondrial ATP synthase by cryo-EM

    Anna Zhou et al.
    Structural analysis of the ATP synthase – in combination with evolutionary covariance analysis – reveals the fold of the a subunit and shows that the enzyme can adopt several different conformations, which support the Brownian ratchet model for generating rotation.
    1. Biochemistry and Chemical Biology
    2. Structural Biology and Molecular Biophysics

    Synergy between RecBCD subunits is essential for efficient DNA unwinding

    Rani Zananiri et al.
    A new optical tweezers assay sheds light on the mechanism of cooperation and force generation by the subunits of RecBCD, critical for the repair of double strand breaks in bacteria.
    1. Microbiology and Infectious Disease
    2. Physics of Living Systems

    Protein gradients on the nucleoid position the carbon-fixing organelles of cyanobacteria

    Joshua S MacCready et al.
    Carboxysomes, the carbon-fixation machinery of cyanobacteria, are equidistantly-positioned by dynamic gradients of the protein McdA on the nucleoid that emerge through interaction with a previously unidentified carboxysome factor, McdB.
    1. Structural Biology and Molecular Biophysics

    HDX-MS reveals nucleotide-dependent, anti-correlated opening and closure of SecA and SecY channels of the bacterial translocon

    Zainab Ahdash et al.
    Hydrogen-deuterium exchange mass spectrometry reveals nucleotide-driven conformational regulation of Sec protein-channel to help impose directionality for protein transport through the Sec complex.
    1. Evolutionary Biology
    2. Plant Biology

    Independent evolution of ancestral and novel defenses in a genus of toxic plants (Erysimum, Brassicaceae)

    Tobias Züst et al.
    A gain-of-function in a new chemical defense resulted in no trade-offs and and independent evolution between novel and ancestral defenses, suggesting low redundancy among different defensive chemicals.
    1. Computational and Systems Biology
    2. Neuroscience

    From behavior to circuit modeling of light-seeking navigation in zebrafish larvae

    Sophia Karpenko et al.
    Light-seeking strategies in Zebrafish larvae are dissected using a virtual-reality assay, and these data are used to establish minimal stochastic and neural-circuits models that quantitatively capture this behavior.

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