Structural insights into substrate recognition by the SOCS2 E3 ubiquitin ligase

Wei-Wei Kung, Sarath Ramachandran, Nikolai Makukhin, Elvira Bruno and Alessio Ciulli ()
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Wei-Wei Kung: University of Dundee
Sarath Ramachandran: University of Dundee
Nikolai Makukhin: University of Dundee
Elvira Bruno: University of Dundee
Alessio Ciulli: University of Dundee

Nature Communications, 2019, vol. 10, issue 1, 1-14

Abstract: Abstract The suppressor of cytokine signaling 2 (SOCS2) acts as substrate recognition subunit of a Cullin5 E3 ubiquitin ligase complex. SOCS2 binds to phosphotyrosine-modified epitopes as degrons for ubiquitination and proteasomal degradation, yet the molecular basis of substrate recognition has remained elusive. Here, we report co-crystal structures of SOCS2-ElonginB-ElonginC in complex with phosphorylated peptides from substrates growth hormone receptor (GHR-pY595) and erythropoietin receptor (EpoR-pY426) at 1.98 Å and 2.69 Å, respectively. Both peptides bind in an extended conformation recapitulating the canonical SH2 domain-pY pose, but capture different conformations of the EF loop via specific hydrophobic interactions. The flexible BG loop is fully defined in the electron density, and does not contact the substrate degron directly. Cancer-associated SNPs located around the pY pocket weaken substrate-binding affinity in biophysical assays. Our findings reveal insights into substrate recognition and specificity by SOCS2, and provide a blueprint for small molecule ligand design.

Date: 2019
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DOI: 10.1038/s41467-019-10190-4

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