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Protein Organization01:24

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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.
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Proteins are one of the most abundant organic molecules in living systems and have the most diverse range of functions of all macromolecules. Proteins may be structural, regulatory, contractile, or protective. They may serve in transport, storage, or membranes; or they may be toxins or enzymes. Their structures, like their functions, vary greatly. They are all, however, amino acid polymers arranged in a linear sequence.
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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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A Protocol for Computer-Based Protein Structure and Function Prediction
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I-TASSER server: new development for protein structure and function predictions.

Jianyi Yang1, Yang Zhang2

  • 1Department of Computational Medicine and Bioinformatics, University of Michigan, 100 Washtenaw Avenue, Ann Arbor, MI 48109-2218, USA School of Mathematical Sciences and LPMC, Nankai University, Tianjin, 300071, PR China yangjy@nankai.edu.cn.

Nucleic Acids Research
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Summary
This summary is machine-generated.

The I-TASSER server enhances protein structure prediction and function annotation using advanced modeling. Recent updates improve atomic refinement, quality estimation, and functional insights for researchers.

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Area of Science:

  • Computational biology
  • Structural bioinformatics
  • Bioinformatics tools

Background:

  • The I-TASSER server is a widely used online resource for automated protein structure prediction and function annotation.
  • User feedback highlighted areas for improvement in modeling accuracy and functionality.

Purpose of the Study:

  • To summarize recent developments in the I-TASSER server.
  • To enhance protein structure prediction and function annotation accuracy.
  • To address user community requirements and suggestions.

Main Methods:

  • Utilizing multiple threading alignment approaches for template recognition from the Protein Data Bank (PDB).
  • Employing iterative fragment assembly simulations for full-length structure model construction.
  • Integrating new methods for atomic-level structure refinement and local structure quality estimation.
  • Deriving functional insights through matching predicted models with known proteins in function databases.

Main Results:

  • Introduction of new methods for atomic-level structure refinement.
  • Implementation of enhanced local structure quality estimation techniques.
  • Improved biological function annotation capabilities.
  • Overall enhancement of the I-TASSER server's predictive accuracy and utility.

Conclusions:

  • Recent developments aim to significantly improve the quality and accuracy of the I-TASSER server.
  • These updates are expected to further facilitate high-resolution protein structure and function prediction for the research community.
  • The enhanced I-TASSER server will continue to be a valuable resource for biological and biomedical investigations.