Structure and Functional Characterization of the Conserved JAK Interaction Region in the Intrinsically Disordered N-Terminus of SOCS5
- Chandrashekaran, IR; Mohanty, B; Linossi, EM; Dagley, LF; Leung, EW; Murphy, JM; Babon, JJ; Nicholson, SE; Norton, RS;
Publication Year 2015-08-04, Volume 54, Issue #30, Page 4672-82
- Journal Title
- Publication Type
- Journal Article
- SOCS5 can negatively regulate both JAK/STAT and EGF-receptor pathways and has therefore been implicated in regulating both the immune response and tumorigenesis. Understanding the molecular basis for SOCS5 activity may reveal novel ways to target key components of these signaling pathways. The N-terminal region of SOCS5 coordinates critical protein interactions involved in inhibition of JAK/STAT signaling, and a conserved region within the N-terminus of SOCS5 mediates direct binding to the JAK kinase domain. Here we have characterized the solution conformation of this conserved JAK interaction region (JIR) within the largely disordered N-terminus of SOCS5. Using nuclear magnetic resonance (NMR) chemical shift analysis, relaxation measurements, and NOE analysis, we demonstrate the presence of preformed structural elements in the JIR of mouse SOCS5 (mSOCS5175-244), consisting of an alpha-helix encompassing residues 224-233, preceded by a turn and an extended structure. We have identified a phosphorylation site (Ser211) within the JIR of mSOCS5 and have investigated the role of phosphorylation in modulating JAK binding using site-directed mutagenesis.
- WEHI Research Division(s)
- Inflammation; Systems Biology And Personalised Medicine; Cell Signalling And Cell Death; Structural Biology
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- Publisher's Version
- NHMRC Grants
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- Refer to copyright notice on published article.
Creation Date: 2015-11-16 11:37:32Last Modified: 2018-03-09 02:37:58