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The EMBO Journal
Article . 2008 . Peer-reviewed
License: Springer Nature TDM
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The EMBO Journal
Article
Data sources: UnpayWall
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The EMBO Journal
Article . 2008
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Structural basis for a novel intrapeptidyl H‐bond and reverse binding of c‐Cbl‐TKB domain substrates

Authors: Ng, C.; Jackson, R.A.; Buschdorf, J.P.; Sun, Q.; Guy, G.R.; Sivaraman, J.;

Structural basis for a novel intrapeptidyl H‐bond and reverse binding of c‐Cbl‐TKB domain substrates

Abstract

The c-Cbl tyrosine kinase binding domain (Cbl-TKB), essentially an 'embedded' SH2 domain, has a critical role in targeting proteins for ubiquitination. To address how this domain can bind to disparate recognition mofits and to determine whether this results in variations in substrate-binding affinity, we compared crystal structures of the Cbl-TKB domain complexed with phosphorylated peptides of Sprouty2, Sprouty4, epidermal growth factor receptor, Syk, and c-Met receptors and validated the binding with point-mutational analyses using full-length proteins. An obligatory, intrapeptidyl H-bond between the phosphotyrosine and the conserved asparagine or adjacent arginine is essential for binding and orients the peptide into a positively charged pocket on c-Cbl. Surprisingly, c-Met bound to Cbl in the reverse direction, which is unprecedented for SH2 domain binding. The necessity of this intrapeptidyl H-bond was confirmed with isothermal titration calorimetry experiments that also showed Sprouty2 to have the highest binding affinity to c-Cbl; this may enable the selective sequestration of c-Cbl from other target proteins.

Country
Singapore
Keywords

Phosphopeptides, Binding Sites, EGFR, Reverse binding, Sprouty, Intracellular Signaling Peptides and Proteins, TKB domain, Membrane Proteins, Proto-Oncogene Proteins c-met, c-Cbl, 540, Cell Line, Protein Structure, Tertiary, src Homology Domains, Proto-Oncogene Proteins, Met, Humans, Receptors, Growth Factor, Proto-Oncogene Proteins c-cbl, X-ray crystallography, Protein Binding

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Powered by OpenAIRE graph
citations
This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Citations provided by BIP!
popularity
This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.
BIP!Popularity provided by BIP!
influence
This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Influence provided by BIP!
impulse
This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.
BIP!Impulse provided by BIP!
63
Top 10%
Top 10%
Top 10%
gold