176 results found
    1. Chromosomes and Gene Expression
    2. Genetics and Genomics

    Structure of the germline genome of Tetrahymena thermophila and relationship to the massively rearranged somatic genome

    Eileen P Hamilton et al.
    The model organism Tetrahymena thermopile carries two nuclei with distinct genomes: an unrearranged germline genome with five chromosomes, and a somatic genome reduced in size by a third and with 181 chromosomes.
    1. Structural Biology and Molecular Biophysics

    Cryo-EM structure of the bifunctional secretin complex of Thermus thermophilus

    Edoardo D'Imprima et al.
    The pilus extrusion/DNA uptake system of Thermus thermophilus contains a 13-mer of the 757-residue PilQ protein and a tightly bound protein outside the outer membrane with a role in DNA binding.
    1. Structural Biology and Molecular Biophysics

    Structure of a type IV pilus machinery in the open and closed state

    Vicki AM Gold et al.
    Electron cryo-tomography reveals a huge conformational change in the secretin domain of the type IV pilus machinery that occurs when the channel opens for pilus extrusion.
    1. Biochemistry and Chemical Biology
    2. Structural Biology and Molecular Biophysics

    Structural basis for the disaggregase activity and regulation of Hsp104

    Alexander Heuck et al.
    Protein disaggregases employ two mechanically-linked ATPase rings that are under steric control by a wrapped-around coiled-coil belt.
    1. Biochemistry and Chemical Biology
    2. Structural Biology and Molecular Biophysics

    Structural insights into the mechanism of the DEAH-box RNA helicase Prp43

    Marcel J Tauchert et al.
    The structural and functional analysis of the ATP-dependent RNA helicase Prp43 provides insights into the mechanisms of RNA binding and translocation, which could serve as paradigm for all DEAH-box proteins.
    1. Evolutionary Biology
    2. Microbiology and Infectious Disease

    Insight into the evolution of microbial metabolism from the deep-branching bacterium, Thermovibrio ammonificans

    Donato Giovannelli et al.
    The genome of Thermovibrio ammonificans encodes ancestral pathways (e.g., hydrogen oxidation) and more recently acquired ones (e.g., nitrate reduction) and a hybrid pathway for CO2 fixation.
    1. Biochemistry and Chemical Biology
    2. Structural Biology and Molecular Biophysics

    tRNA ligase structure reveals kinetic competition between non-conventional mRNA splicing and mRNA decay

    Jirka Peschek, Peter Walter
    Interconnected RNA processing mechanisms ensure the fidelity of non-conventional mRNA splicing during the unfolded protein response.
    1. Structural Biology and Molecular Biophysics

    Mechanical inhibition of isolated Vo from V/A-ATPase for proton conductance

    Jun-ichi Kishikawa et al.
    Cryo-EM structures of rotary V-ATPase reveal the ON-OFF switching mechanism of H+ translocation in the Vo membrane domain.
    1. Structural Biology and Molecular Biophysics

    The inner junction complex of the cilia is an interaction hub that involves tubulin post-translational modifications

    Ahmad Abdelzaher Zaki Khalifa et al.
    A structure of the ciliary inner junction at 3.6 Å resolution permits atomic modeling of six inner junction proteins and their interactions with acetylated lysine 40 loops of alpha tubulins.
    1. Cell Biology
    2. Chromosomes and Gene Expression

    Methylation of histone H3K23 blocks DNA damage in pericentric heterochromatin during meiosis

    Romeo Papazyan et al.
    A previously unappreciated histone methylation pathway helps limit DNA double-strand break formation and recombination in heterochromatin during meiosis.

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