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Updated: Oct 9, 2025

Examining BCL-2 Family Function with Large Unilamellar Vesicles
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Impact of Deamidation on the Structure and Function of Antiapoptotic Bcl-xL

Gamze Tanriver1,2, Gerald Monard2, Saron Catak1

  • 1Department of Chemistry, Bogazici University, Bebek, 34342 Istanbul, Turkey.

Journal of Chemical Information and Modeling
|December 23, 2021
PubMed

Insights

Deamidation of Bcl-xL, an anti-cancer protein, alters its structure and dynamics, particularly in the intrinsically disordered region (IDR). This modification leads to a loss of function and promotes tumor cell death.

Area of Science:

  • Biochemistry
  • Molecular Biology
  • Structural Biology

Background:

  • Bcl-xL is a key anti-apoptotic protein essential for tumor cell survival.
  • Deamidation of Bcl-xL is a critical post-translational modification (PTM) that regulates its function.
  • The intrinsically disordered region (IDR) of Bcl-xL is a primary site for PTMs and influences its structure and dynamics.

Purpose of the Study:

  • To investigate deamidation-induced conformational changes in Bcl-xL.
  • To understand the molecular mechanisms underlying Bcl-xL's loss of function upon deamidation.
  • To explore the role of the IDR in deamidation-mediated effects on Bcl-xL.

Main Methods:

  • Microsecond-long molecular dynamics (MD) simulations were employed.
  • Principal component analysis (PCA) was used to analyze structural and dynamic differences.
  • Clustering analysis and H-bond analysis were performed to assess conformational changes.

Main Results:

  • Deamidation significantly altered the motion and interaction patterns within the IDR of Bcl-xL.
  • PCA revealed distinct structural and dynamic profiles between wild-type and deamidated Bcl-xL.
  • Conformational changes, including a narrowed binding groove, indicated deamidation-induced allosteric effects.

Conclusions:

  • The IDR plays a crucial role in the loss of apoptotic functions of Bcl-xL following deamidation.
  • Deamidation induces allosteric changes affecting Bcl-xL's structure and dynamics.
  • This study provides insights into the mechanism of deamidation-induced cell death mediated by Bcl-xL.

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