Mapping the binding interface of ERK and transcriptional repressor Capicua using photocrosslinking

Alan S. Futran, Saw Kyin, Stanislav Y. Shvartsman, A. James Link

Research output: Contribution to journalArticlepeer-review

40 Scopus citations


Extracellular signal-regulated kinase (ERK) coordinates cellular responses to a range of stimuli by phosphorylating its numerous substrates. One of these substrates, Capicua (Cic), is a transcriptional repressor that was first identified in Drosophila and has been implicated in a number of human diseases. Here we use a chemical biology approach to map the binding interface of ERK and Cic. The noncanonical amino acid p-azidophenylalanine (AzF) was introduced into the ERK-binding region of Drosophila Cic, and photocrosslinking and tandem mass spectrometry were used to pinpoint its binding site on ERK. We also identified the ERK-binding region of human Cic and showed that it binds to the same site on ERK despite lacking conservation with the Drosophila Cic binding region. Finally, we mapped the amino acids involved in human Cic binding to ERK using AzF-labeled ERK. These results reveal the molecular details of the ERK-Cic interaction and demonstrate that the photocrosslinking approach is complementary to existing methods for mapping kinase-substrate binding interfaces.

Original languageEnglish (US)
Pages (from-to)8590-8595
Number of pages6
JournalProceedings of the National Academy of Sciences of the United States of America
Issue number28
StatePublished - Jul 14 2015

All Science Journal Classification (ASJC) codes

  • General


  • Photocrosslinking
  • Protein-protein interactions
  • Signal transduction


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