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Related Concept Videos

Protein Folding01:25

Protein Folding

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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.
Protein Structure Is Critical to Its Biological Function
Proteins perform a wide range of biological functions such as catalyzing chemical reactions, providing...
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The native conformation of a protein is formed by interactions between the side chains of its constituent amino acids. When the amino acids cannot form these interactions, the protein cannot fold by itself and needs chaperones. Notably, chaperones do not relay any additional information required for the folding of polypeptides; the native conformation of a protein is determined solely by its amino acid sequence. Chaperones catalyze protein folding without being a part of the folded protein.
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Protein Folding Quality Check in the RER01:29

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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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Conservation of Protein Domains Over Different Proteins02:26

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Protein domains are small structurally independent units that are part of a single amino acid chain.  Although these domains are often structurally independent, they may rely on synergistic effects to perform their functions as part of a larger protein. Protein domains may be conserved within the same organism, as well as across different organisms.
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Microfluidic Mixers for Studying Protein Folding
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Microfluidic Mixers for Studying Protein Folding

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Accurate site-specific folding via conditional diffusion based on AlphaFold3.

Haocheng Tang1,2, Junmei Wang1,2

  • 1Department of Pharmaceutical Sciences, School of Pharmacy, University of Pittsburgh, Pittsburgh, PA 15213.

Proceedings of the National Academy of Sciences of the United States of America
|October 30, 2025
PubMed
Summary
This summary is machine-generated.

SiteAF3 enhances biomolecular complex structure prediction by refining AlphaFold3 with conditional diffusion. This method improves accuracy for specific binding sites, aiding drug discovery and biological process understanding.

Keywords:
AlphaFold3SiteAF3biomoleculesdiffusiondocking

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Area of Science:

  • Computational Biology
  • Structural Biology
  • Drug Discovery

Background:

  • Accurate prediction of biomolecular complex structures is vital for biological insights and drug development.
  • Existing tools like AlphaFold3 show advancements but require improvement for site-specific accuracy.

Purpose of the Study:

  • To introduce SiteAF3, a novel method for accurate site-specific folding of biomolecular complexes.
  • To enhance the AlphaFold3 framework for improved prediction at specific binding interfaces.

Main Methods:

  • SiteAF3 utilizes conditional diffusion, refining the AlphaFold3 process.
  • It involves fixing the receptor structure and optionally incorporating binding pocket and hotspot residue data.

Main Results:

  • SiteAF3 consistently outperforms AlphaFold3 across protein-small molecule, protein-peptide, and protein-nucleic acid interactions.
  • The method shows particular strength in predicting structures for orphan proteins and allosteric ligands.
  • SiteAF3 achieves higher accuracy with reduced computational expense.

Conclusions:

  • SiteAF3 provides a significant improvement for accurate, site-specific biomolecular complex structure prediction.
  • As a user-friendly plug-in for AlphaFold3, it offers a valuable tool for researchers in structural biology and drug discovery.