2y1n Citations

Structural basis for autoinhibition and phosphorylation-dependent activation of c-Cbl.

Nat Struct Mol Biol 19 184-92 (2012)
Related entries: 2y1m, 4a49, 4a4b, 4a4c

Cited: 117 times
EuropePMC logo PMID: 22266821

Abstract

Cbls are RING ubiquitin ligases that attenuate receptor tyrosine kinase (RTK) signal transduction. Cbl ubiquitination activity is stimulated by phosphorylation of a linker helix region (LHR) tyrosine residue. To elucidate the mechanism of activation, we determined the structures of human CBL, a CBL-substrate peptide complex and a phosphorylated-Tyr371-CBL-E2-substrate peptide complex, and we compared them with the known structure of a CBL-E2-substrate peptide complex. Structural and biochemical analyses show that CBL adopts an autoinhibited RING conformation, where the RING's E2-binding surface associates with CBL to reduce E2 affinity. Tyr371 phosphorylation activates CBL by inducing LHR conformational changes that eliminate autoinhibition, flip the RING domain and E2 into proximity of the substrate-binding site and transform the RING domain into an enhanced E2-binding module. This activation is required for RTK ubiquitination. Our results present a mechanism for regulation of c-Cbl's activity by autoinhibition and phosphorylation-induced activation.

Reviews - 2y1n mentioned but not cited (2)

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Articles - 2y1n mentioned but not cited (4)

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