Download MendeleyInsight into the molecular recognition mechanism of the coactivator NCoA1 by STAT6.
Russo, L., Giller, K., Pfitzner, E., Griesinger, C., Becker, S.(2017) Sci Rep 7: 16845-16845
- PubMed: 29203888
- DOI: https://doi.org/10.1038/s41598-017-17088-5
- Primary Citation of Related Structures:
5NWM, 5NWX - PubMed Abstract:
Crucial for immune and anti-inflammatory cellular responses, signal transducer and activator of transcription 6 (STAT6) regulates transcriptional activation in response to interleukin-4 and -13 -induced tyrosine phosphorylation by direct interaction with coactivators. The interaction of STAT6 with nuclear coactivator 1 (NCoA1) is mediated by a short region of the STAT6 transactivation domain that includes the motif LXXLL and interacts with the PAS-B domain of NCoA1. Despite the availability of an X-ray structure of the PAS-B domain/ Leu 794 -Gly 814 -STAT6 complex, the mechanistic details of this interaction are still poorly understood. Here, we determine the structure of the NCoA1 257-385 /STAT6 783-814 complex using Nuclear Magnetic Resonance (NMR) and X-ray crystallography. The STAT6 783-814 peptide binds with additional N-terminal amino acids to NCoA1 257-385 , compared to the STAT6 794-814 peptide, explaining its higher affinity. Secondary and tertiary structures existing in the free peptide are more highly populated in the complex, suggesting binding by conformational selection.
Organizational Affiliation:
Department for NMR based Structural Biology, Max Planck Institute for Biophysical Chemistry, Am Fassberg 11, 37077, Göttingen, Germany.
