Molecular Architecture of the Ankyrin SOCS Box Family of CuI5-Dependent E3 Ubiquitin Ligases

作者：Muniz Joao R C; Guo Kunde; Kershaw Nadia J; Ayinampudi Vikram; von Delft Frank; Babon Jeffrey J; Bullock Alex N^*

来源：Journal of Molecular Biology, 2013, 425(17): 3166-3177.

DOI：10.1016/j.jmb.2013.06.015

• proteasome
• signaling
• ubiquitination
• degradation
• protein-protein interaction

Multi-subunit Cullin-RING E3 ligases often use repeat domain proteins as substrate-specific adaptors. Structures of these macromolecular assemblies are determined for the F-box-containing leucine-rich repeat and WD40 repeat families, but not for the suppressor of cytokine signaling (SOCS)-box-containing ankyrin repeat proteins (ASB1-18), which assemble with Elongins B and C and Cul5. We determined the crystal structures of the ternary complex of ASB9-Elongin B/C as well as the interacting N-terminal domain of Cul5 and used structural comparisons to establish a model for the complete Cul5-based E3 ligase. The structures reveal a distinct architecture of the ASB9 complex that positions the ankyrin domain coaxial to the SOCS box Elongin B/C complex and perpendicular to other repeat protein complexes. This alternative architecture appears favorable to present the ankyrin domain substrate-binding site to the E2-ubiquitin, while also providing spacing suitable for bulky ASB9 substrates, such as the creatine kinases. The presented Cul5 structure also differs from previous models and deviates from other Cullins via a rigid-body rotation between Cullin repeats. This work highlights the adaptability of repeat domain proteins as scaffolds in substrate recognition and lays the foundation for future structure-function studies of this important E3 family.

• 出版日期2013-9-9
• 单位河北医科大学