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Mol Cell. 2014 Mar 6;53(5):738-51. doi: 10.1016/j.molcel.2014.01.015. Epub 2014 Feb 20.

Oncogenic RET kinase domain mutations perturb the autophosphorylation trajectory by enhancing substrate presentation in trans.

Author information

1
Structural Biology Laboratory, London Research Institute, Cancer Research UK, WC2A 3LY London, UK. Electronic address: ivan.plaza-menacho@cancer.org.uk.
2
Protein Analysis and Proteomics, London Research Institute, Cancer Research UK, WC2A 3LY London, UK.
3
Structural Biology Laboratory, London Research Institute, Cancer Research UK, WC2A 3LY London, UK.
4
Protein Structure Function Laboratory, London Research Institute, Cancer Research UK, WC2A 3LY London, UK.
5
Protein Production Facility, London Research Institute, Cancer Research UK, WC2A 3LY London, UK.
6
Structural Biology Laboratory, London Research Institute, Cancer Research UK, WC2A 3LY London, UK; Institute of Structural and Molecular Biology, Department of Biological Sciences, Birkbeck College, WC1E 7HX London, UK. Electronic address: neil.mcdonald@cancer.org.uk.

Abstract

To decipher the molecular basis for RET kinase activation and oncogenic deregulation, we defined the temporal sequence of RET autophosphorylation by label-free quantitative mass spectrometry. Early autophosphorylation sites map to regions flanking the kinase domain core, while sites within the activation loop only form at later time points. Comparison with oncogenic RET kinase revealed that late autophosphorylation sites become phosphorylated much earlier than wild-type RET, which is due to a combination of an enhanced enzymatic activity, increased ATP affinity, and surprisingly, by providing a better intermolecular substrate. Structural analysis of oncogenic M918T and wild-type RET kinase domains reveal a cis-inhibitory mechanism involving tethering contacts between the glycine-rich loop, activation loop, and αC-helix. Tether mutations only affected substrate presentation but perturbed the autophosphorylation trajectory similar to oncogenic mutations. This study reveals an unappreciated role for oncogenic RET kinase mutations in promoting intermolecular autophosphorylation by enhancing substrate presentation.

PMID:
24560924
PMCID:
PMC3988870
DOI:
10.1016/j.molcel.2014.01.015
[Indexed for MEDLINE]
Free PMC Article

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