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Inherent α-Helix Around Tyrosine 183 in the Intrinsically Disordered Tail of the Multi-Site Docking Platform Gab1
Anne Dietrich1, Marc Lewitzky1, Tobias Gruber1
1Tumor Biology Section, Institute of Molecular Medicine, Martin Luther University Halle-Wittenberg, Halle (Saale), Germany.
Biopolymers
|August 4, 2026
Summary
Intrinsically disordered proteins utilize short linear motifs for function. Researchers structurally characterized a Gab1 protein fragment, revealing a stable alpha-helix around Tyr183, offering insights into protein interactions.
Area of Science:
- * Molecular Biology
- * Structural Biology
- * Biochemistry
Background:
- * Intrinsically disordered proteins (IDPs) play crucial roles in cellular signaling, often mediated by short linear motifs.
- * The Grb2-associated binder 1 (Gab1) protein's C-terminal region is intrinsically disordered and contains phosphorylation sites, but specific structural features remain uncharacterized.
- * Tyrosine residues Tyr162 and Tyr183 in Gab1 have not been structurally studied, despite their potential functional significance.
Purpose of the Study:
- * To structurally characterize a fragment of the Gab1 protein (residues 142-203) using biophysical and computational methods.
- * To investigate the local structural environment of Tyr162 and Tyr183 within the Gab1 C-terminal region.
- * To determine the stability and potential functional implications of any observed structural elements.
Main Methods:
- * Computational prediction of protein structure.
- * Circular dichroism spectroscopy to assess secondary structure.
- * High-resolution Nuclear Magnetic Resonance (NMR) spectroscopy, including chemical shift and relaxation analyses.
Main Results:
- * NMR analysis revealed a stable alpha-helix encompassing residues Pro180 to Ile187, with Tyr183 centrally located within this helix.
- * The majority of the Gab1 fragment, including the region around Tyr162, remained intrinsically disordered.
- * The helical conformation around Tyr183 was found to be stable across various conditions, including pH changes, peptide length variations, and phosphorylation status.
Conclusions:
- * The identified alpha-helix around Tyr183 represents a distinct structural feature within the disordered Gab1 C-terminal tail.
- * This localized helical structure differentiates the microenvironment of Tyr183 from Tyr162.
- * The findings provide a structural basis for future investigations into Gab1's interaction partners and the functional roles of this specific motif.
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