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Related Concept Videos

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

Overview
Protein Folding01:22

Protein Folding

Overview
Protein Folding01:25

Protein Folding

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...
Protein Folding01:22

Protein Folding

Overview
Unsymmetric Bending - Angle of Neutral Axis01:15

Unsymmetric Bending - Angle of Neutral Axis

Unsymmetrical bending occurs when a structural member is subjected to bending moments in a plane that does not align with the member's principal axes. This scenario typically arises in beams and other structural components when loads are applied at non-ideal angles, introducing complexities in stress analysis.
When a bending moment is applied at an angle θ concerning the vertical axis of a symmetrical member, it can be resolved into components along the member's principal centroidal axes. The...

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Related Experiment Video

Updated: Jul 6, 2026

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

TALI: local alignment of protein structures using backbone torsion angles.

Xijiang Miao1, Peter J Waddell, Homayoun Valafar

  • 1Department of Computer Science and Engineering, University of South Carolina, 301 Main Street, Columbia, SC 29208, USA. miaox@cse.sc.edu

Journal of Bioinformatics and Computational Biology
|March 8, 2008
PubMed
Summary

Torsion angle alignment (TALI) is a new method for aligning protein structures using backbone torsion angles. TALI matches local motifs and global similarity, outperforming other methods in challenging alignments.

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Last Updated: Jul 6, 2026

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Area of Science:

  • Structural bioinformatics
  • Computational biology
  • Protein structure analysis

Background:

  • Traditional protein structure alignment relies on atomic distance matrices.
  • Integrating sequence and structural information is crucial for accurate alignment.
  • Existing methods like DALI, CE, and SSM have limitations in certain alignment tasks.

Purpose of the Study:

  • Introduce Torsion Angle Alignment (TALI) as a novel approach for local and global protein structure alignment.
  • Evaluate TALI's performance against established structure and sequence alignment methods.
  • Demonstrate TALI's utility in evolutionary studies of protein families.

Main Methods:

  • Representing protein structures as sequences of backbone torsion angles (phi, psi).
  • Utilizing mature sequence alignment techniques for improved performance and quality.
  • Comparing TALI with DALI, CE, SSM, and PSI-BLAST on challenging structural alignments.

Main Results:

  • TALI successfully matches local structural motifs and identifies global structural similarity.
  • TALI demonstrates equal or superior performance compared to DALI, CE, SSM, and PSI-BLAST.
  • TALI's application in inferring an evolutionary tree for aminoacyl-tRNA synthetases highlights its potential.

Conclusions:

  • TALI offers a robust and effective method for protein structure alignment.
  • The torsion angle-based approach facilitates integration of sequence and structural data.
  • TALI has significant potential for analyzing protein structural evolution and divergence.