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Related Concept Videos

Protein-protein Interfaces02:04

Protein-protein Interfaces

Many proteins form complexes to carry out their functions, making protein-protein interactions (PPIs) essential for an organism's survival. Most PPIs are stabilized by numerous weak noncovalent chemical forces. The physical shape of the interfaces determines the way two proteins interact. Many globular proteins have closely-matching shapes on their surfaces, which form a large number of weak bonds. Additionally, many PPIs occur between two helices or between a surface cleft and a polypeptide...
Protein-Protein Interfaces02:04

Protein-Protein Interfaces

Many proteins form complexes to carry out their functions, making protein-protein interactions (PPIs) essential for an organism's survival. Most PPIs are stabilized by numerous weak noncovalent chemical forces. The physical shape of the interfaces determines the way two proteins interact. Many globular proteins have closely-matching shapes on their surfaces, which form a large number of weak bonds. Additionally, many PPIs occur between two helices or between a surface cleft and a polypeptide...
Protein Organization01:24

Protein Organization

Proteins are polymers of amino acid residues. They are versatile and responsible for different cellular functions, including DNA replication, molecular transport, catalysis, and structural support. Proteins have a hierarchical structure comprising at least three levels of organization: primary, secondary, and tertiary structure. Some large proteins have a quaternary structure where individual protein subunits are linked together.
The primary structure of a protein is its amino acid sequence.
Protein Organization01:13

Protein Organization

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Protein Organization01:24

Protein Organization

Proteins are polymers of amino acid residues. They are versatile and responsible for different cellular functions, including DNA replication, molecular transport, catalysis, and structural support. Proteins have a hierarchical structure comprising at least three levels of organization: primary, secondary, and tertiary structure. Some large proteins have a quaternary structure where individual protein subunits are linked together.
The primary structure of a protein is its amino acid sequence.
Protein Organization01:13

Protein Organization

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A Protocol for Computer-Based Protein Structure and Function Prediction
16:41

A Protocol for Computer-Based Protein Structure and Function Prediction

Published on: November 3, 2011

Functional classification of protein 3D structures from predicted local interaction sites.

Ramya Parasuram1, Joslynn S Lee, Pengcheng Yin

  • 1Department of Chemistry & Chemical Biology, Northeastern University, Boston, MA 02115, USA.

Journal of Bioinformatics and Computational Biology
|December 15, 2010
PubMed
Summary

This study introduces a novel method for classifying protein 3D structures by predicting functional sites. This approach improves accuracy in determining protein biochemical functions, correcting misannotations in structural genomics.

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Area of Science:

  • Structural biology
  • Bioinformatics
  • Computational chemistry

Background:

  • Accurate functional classification of proteins is crucial for understanding biological processes.
  • Existing methods often rely on overall structural similarity, which can be insufficient for precise functional prediction.
  • Structural genomics projects generate numerous protein structures requiring functional annotation.

Purpose of the Study:

  • To develop and apply a new computational approach for the functional classification of protein 3D structures.
  • To enhance the accuracy of predicting protein biochemical functions using localized functional site analysis.
  • To re-evaluate and correct annotations for proteins from structural genomics initiatives.

Main Methods:

  • Utilizing THEMATICS (electrostatic potentials) and POOL (machine learning) for functional site prediction.
  • Implementing structural alignment of predicted functional residues against known protein functions.
  • Applying the method to structural genomics proteins, including those with ribulose phosphate binding barrel (RPBB) fold.

Main Results:

  • Demonstrated that local functional site matching is a more reliable predictor of biochemical function than global structure matching.
  • Confirmed the annotation of a structural genomics protein with the RPBB fold.
  • Identified a putative glucoamylase (PDB ID 3eu8) as likely not a glucoamylase.
  • Showed that a Streptomyces coelicolor protein (PDB ID 3g64) annotated as enoyl-CoA hydratase is likely misannotated and may be a dehalogenase.

Conclusions:

  • The developed method provides a more accurate and reliable approach to functional classification of protein 3D structures.
  • This method is particularly valuable for annotating proteins from structural genomics projects.
  • The study highlights the importance of localized functional site analysis over global structural comparison for accurate functional prediction and corrects existing protein annotations.