2,817 results found
    1. Biochemistry and Chemical Biology

    Insights into AMS/PCAT transporters from biochemical and structural characterization of a double Glycine motif protease

    Silvia C Bobeica et al.
    Structural and biochemical characterization of the protease domain of an ABC transporter demonstrates the basis for recognition of substrate leader peptides.
    1. Structural Biology and Molecular Biophysics

    Atomic structure of the 26S proteasome lid reveals the mechanism of deubiquitinase inhibition

    Corey M Dambacher et al.
    Within the isolated lid sub-complex of the proteasome, a finely tuned network of interactions maintains the deubiquitinase in an inhibited conformation; dramatic rearrangements of the lid subunits upon incorporation into the holoenzyme lead to the deubiquitinase’s activation.
    1. Biochemistry and Chemical Biology
    2. Microbiology and Infectious Disease

    A widespread family of serine/threonine protein phosphatases shares a common regulatory switch with proteasomal proteases

    Niels Bradshaw et al.
    Structures of active and inactive conformations of a PP2C family phosphatase reveal a conserved switch that controls enzymatic activity and point to an unexpected relationship between phosphatases and proteasomal proteases.
    1. Structural Biology and Molecular Biophysics

    2.8 Å resolution reconstruction of the Thermoplasma acidophilum 20S proteasome using cryo-electron microscopy

    Melody G Campbell et al.
    Water molecules and amino-acid side chain rotamers have been resolved in the cryoEM structure of T20S proteasome at 2.8 angstroms.
    1. Structural Biology and Molecular Biophysics

    Model-based local density sharpening of cryo-EM maps

    Arjen J Jakobi et al.
    Local sharpening of cryo-electron microscopy maps using atomic models can increase the interpretability of densities in cases of resolution variation and facilitates model building and refinement.
    1. Structural Biology and Molecular Biophysics

    Structural basis of ClpXP recognition and unfolding of ssrA-tagged substrates

    Xue Fei et al.
    Cryo-EM structures of the AAA+ ClpXP protease bound to an ssrA degron reveal the mechanism of substrate recognition and show how the machine transitions from recognition to translocation and unfolding.
    1. Biochemistry and Chemical Biology
    2. Cell Biology

    Robust cullin-RING ligase function is established by a multiplicity of poly-ubiquitylation pathways

    Spencer Hill et al.
    Human cullin-RING ligases are buffered to a much greater extent than had been previously appreciated, and the roles of ubiquitin chain extension enzymes are far more nuanced at physiological concentrations.
    1. Computational and Systems Biology

    Quantitative time-resolved analysis reveals intricate, differential regulation of standard- and immuno-proteasomes

    Juliane Liepe et al.
    Experimental and computational analyses reveal how proteasomal hydrolysis is regulated and show that peptide transport is the rate-limiting step and the main differentiating factor between human standard- and immuno-proteasomes.
    1. Structural Biology and Molecular Biophysics

    Structural basis of substrate recognition by a polypeptide processing and secretion transporter

    Virapat Kieuvongngam et al.
    Cryo-EM structure of a peptidase-containing ABC transporter in complex with its protein substrate reveals a mechanism of coupling substrate cleavage to translocation.
    1. Structural Biology and Molecular Biophysics

    Modelling dynamics in protein crystal structures by ensemble refinement

    B Tom Burnley et al.
    A combination of molecular dynamics simulations and X-ray diffraction data has been used to construct more realistic models of proteins and to provide new insights into their interactions with other proteins and biomolecules.

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