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- W2038542011 abstract "The multisubunit cullin RING E3 ubiquitin ligases (CRLs) target post-translationally modified substrates for ubiquitination and proteasomal degradation. The suppressors of cytokine signaling (SOCS) proteins play important roles in inflammatory processes, diabetes, and cancer and therefore represent attractive targets for therapeutic intervention. The SOCS proteins, among their other functions, serve as substrate receptors of CRL5 complexes. A member of the CRL family, SOCS2-EloBC-Cul5-Rbx2 (CRL5(SOCS2)), binds phosphorylated growth hormone receptor as its main substrate. Here, we demonstrate that the components of CRL5(SOCS2) can be specifically pulled from K562 human cell lysates using beads decorated with phosphorylated growth hormone receptor peptides. Subsequently, SOCS2-EloBC and full-length Cul5-Rbx2, recombinantly expressed in Escherichia coli and in Sf21 insect cells, respectively, were used to reconstitute neddylated and unneddylated CRL5(SOCS2) complexes in vitro. Finally, diverse biophysical methods were employed to study the assembly and interactions within the complexes. Unlike other E3 ligases, CRL5(SOCS2) was found to exist in a monomeric state as confirmed by size exclusion chromatography with inline multiangle static light scattering and native MS. Affinities of the protein-protein interactions within the multisubunit complex were measured by isothermal titration calorimetry. A structural model for full-size neddylated and unneddylated CRL5(SOCS2) complexes is supported by traveling wave ion mobility mass spectrometry data." @default.
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- W2038542011 date "2015-02-01" @default.
- W2038542011 modified "2023-10-11" @default.
- W2038542011 title "Biophysical Studies on Interactions and Assembly of Full-size E3 Ubiquitin Ligase" @default.
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- W2038542011 doi "https://doi.org/10.1074/jbc.m114.616664" @default.
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