3,464 results found
    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. Cell Biology

    Compromising the 19S proteasome complex protects cells from reduced flux through the proteasome

    Peter Tsvetkov et al.
    Reducing the expression of 19S subunits shifts the ratio of 20S/26S proteasome complexes and provides a powerful survival advantage in the face of lethal proteasome inhibition.
    1. Biochemistry and Chemical Biology
    2. Structural Biology and Molecular Biophysics

    Heterogeneity of proteome dynamics between connective tissue phases of adult tendon

    Howard Choi et al.
    Metabolic labelling reveals complex proteome dynamics in tendon, with faster turnover of proteins in the glycoprotein-rich interfascicular matrix compared to the collagen-rich fascicular matrix.
    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. Developmental Biology

    Ripply2 recruits proteasome complex for Tbx6 degradation to define segment border during murine somitogenesis

    Wei Zhao et al.
    Inducing presomitic mesoderm (PSM)-fated ES cells clarified that Ripply2 directly interacts with Tbx6 and degrades Tbx6 in proteasome-ubiquitin pathway by recruiting the 26S proteasome, which is a PSM-specific event to define the segment border during mouse somitogenesis.
    1. Neuroscience

    α-synuclein strains that cause distinct pathologies differentially inhibit proteasome

    Genjiro Suzuki et al.
    One α-synuclein strain inhibited proteasome activity and induced apparent pathologies, while the other did not, indicating a strain-dependent toxicity of α-synuclein aggregates, which support a prion-like behavior of α-synuclein.
    1. Biochemistry and Chemical Biology

    Specific lid-base contacts in the 26s proteasome control the conformational switching required for substrate degradation

    Eric R Greene et al.
    The 26S proteasome lid subcomplex acts as an external scaffold whose interactions with the ATPase motor stabilize the substrate-engagement-competent state, and control conformational changes upon engagement for subsequent degradation steps.
    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. Biochemistry and Chemical Biology

    The aspartyl protease DDI2 activates Nrf1 to compensate for proteasome dysfunction

    Shun Koizumi et al.
    Peptidase activity of DDI2 is required to activate Nrf1 in order to enable proteasome recovery in response to proteasome inhibition.
    1. Biochemistry and Chemical Biology
    2. Cell Biology

    The serine protease hepsin mediates urinary secretion and polymerisation of Zona Pellucida domain protein uromodulin

    Martina Brunati et al.
    Hepsin is the first protease identified to modulate specific cleavage and secretion of a Zona Pellucida domain protein, uromodulin.

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