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A pH Switch for β-Sheet Protein Folding.

Jordan M Anderson1, Niels H Andersen1

  • 1University of Washington, Seattle, WA, 98105, USA.

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|May 20, 2017
PubMed
Summary
This summary is machine-generated.

Researchers designed a pH-switchable protein turn (HPATGK) that alters protein folding based on acidity. This protein engineering strategy enables controllable conformational changes in biomolecules for biotechnological applications.

Keywords:
conformational switchpH switchprotein designprotein foldingβ-sheets

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Area of Science:

  • Protein Engineering
  • Biotechnology
  • Structural Biology

Background:

  • Advancements in protein design focus on creating stable and specific protein structures.
  • Controlling protein folding and stability is crucial for biotechnological applications.

Purpose of the Study:

  • To engineer a novel 6-residue sequence (HPATGK) that functions as a pH-switchable structure-nucleating turn.
  • To investigate the impact of this pH-switch sequence on the folding stability of beta-sheets.

Main Methods:

  • Introduction of the HPATGK sequence into the turn of a standard 3-stranded beta-sheet model (WW domain).
  • Analysis of folding characteristics and melting temperature (Tm) at varying pH levels (pH 8 and pH 2.5).
  • Thermodynamic analysis to quantify the change in folding free energy (ΔΔGF).

Main Results:

  • The HPATGK sequence acted as a stable turn at physiological and higher pH.
  • A significant drop in melting temperature (Tm) of approximately 50°C was observed at pH 2.5 compared to pH 8.
  • The insertion resulted in a substantial change in folding stability (ΔΔGF ≥11.3 kJ mol⁻¹).

Conclusions:

  • The engineered HPATGK sequence effectively introduces a pH-dependent folding switch into beta-sheet structures.
  • This strategy allows for the design of proteins with tunable conformational stability based on pH.
  • The findings pave the way for creating novel biomolecular tools with controllable conformational changes.