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 ...
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.
Related Citations:
Structure of the NCoA-1/SRC-1 PAS-B Domain Bound to the LXXLL Motif of the STAT6 Transactivation domain Razeto, A., Ramakrishnan, V., Litterst, C.M., Giller, K., Griesinger, C., Carlomagno, T., Lakomek, N., Heimburg, T., Lodrini, M., Pfitzner, E., Becker, S. (2004) J Mol Biol 336: 319
Crystallization and preliminary crystallographic studies of the NCoA-1/SRC-1 PAS-B domain bound to the LXXLL motif of the STAT6 transactivation domain Razeto, A., Pfitzner, E., Becker, S. (2004) Acta Crystallogr D Biol Crystallogr D60: 550
Organizational Affiliation:
Department for NMR based Structural Biology, Max Planck Institute for Biophysical Chemistry, Am Fassberg 11, 37077, Göttingen, Germany. sabe@nmr.mpibpc.mpg.de.
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