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ER is the primary site for the maturation and folding of soluble and transmembrane secretory proteins. The calnexin cycle is a specific chaperone system that folds and assesses the confirmation of N-glycosylated proteins before they can exit the ER lumen. The primary players of this quality check pipeline are the lectins, ER-resident chaperones, and a glucosyl transferase enzyme. In case the calnexin system in the lumen fails to salvage a misfolded protein, it is transported to the cytoplasm...
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Protein Folding01:25

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Proteins are chains of amino acids linked together by peptide bonds. Upon synthesis, a protein folds into a three-dimensional conformation, critical to its biological function. Interactions between its constituent amino acids guide protein folding, and hence the protein structure is primarily dependent on its amino acid sequence.
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Integrating Rigidity Analysis into the Exploration of Protein Conformational Pathways Using RRT* and MC.

Fatemeh Afrasiabi1, Ramin Dehghanpoor1, Nurit Haspel1

  • 1Department of Computer Science, University of Massachusetts Boston, Boston, MA 02125, USA.

Molecules (Basel, Switzerland)
|April 30, 2021
PubMed
Summary
This summary is machine-generated.

This study enhances protein conformational change exploration by integrating rigidity analysis into a hybrid Monte-Carlo and RRT* algorithm. This approach significantly speeds up the discovery of protein pathways and intermediate structures.

Keywords:
conformational pathwaysprotein conformationsrapidly exploring random trees algorithmrigidity analysis

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Area of Science:

  • Biophysics
  • Computational Biology
  • Structural Biology

Background:

  • Understanding protein structure and dynamics is crucial for cellular function.
  • Experimentally capturing transient protein conformational changes is challenging.
  • Computational methods struggle with high-dimensional conformational search spaces.

Purpose of the Study:

  • To improve the efficiency and accuracy of exploring large protein conformational changes.
  • To develop a computational method capable of finding complex protein pathways.
  • To accelerate the identification of intermediate protein structures.

Main Methods:

  • Implemented a hybrid algorithm combining Monte-Carlo (MC) sampling and Rapidly Exploring Random Trees (RRT*).
  • Integrated protein rigidity analysis to guide conformational sampling towards flexible regions.
  • Utilized a robotics-based approach for efficient pathway exploration.

Main Results:

  • The integrated rigidity analysis significantly reduced computational run time.
  • The algorithm demonstrated accelerated convergence in exploring conformational landscapes.
  • Smoother and more accurate conformational pathways were generated.

Conclusions:

  • Rigidity analysis is an effective strategy for optimizing protein conformational search algorithms.
  • The hybrid MC-RRT* method with rigidity guidance enhances the study of protein dynamics.
  • This approach facilitates the discovery of functionally relevant protein conformations.