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Protein Organization01:24

Protein Organization

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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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Many proteins’ biological role depends on their interactions with their ligands, small molecules that bind to specific locations on the protein known as ligand-binding sites. Ligand-binding sites are often conserved among homologous proteins as these sites are critical for protein function.
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A Protocol for Computer-Based Protein Structure and Function Prediction
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Protein Structure and Function Prediction Using I-TASSER.

Jianyi Yang1,2, Yang Zhang1,3

  • 1Department of Computational Medicine and Bioinformatics, University of Michigan, Ann Arbor, Michigan.

Current Protocols in Bioinformatics
|December 19, 2015
PubMed
Summary
This summary is machine-generated.

I-TASSER provides automated protein structure prediction and function annotation. This hierarchical protocol generates atomic models and infers biological functions, aiding researchers in understanding protein roles.

Keywords:
I-TASSERprotein function annotationprotein structure predictionthreading

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Area of Science:

  • Computational biology
  • Structural bioinformatics
  • Protein science

Background:

  • Accurate protein structure prediction is crucial for understanding biological functions.
  • Automated methods are needed to handle the vast number of protein sequences.

Purpose of the Study:

  • To describe the I-TASSER protocol for automated protein structure and function prediction.
  • To guide users on interpreting I-TASSER results and improving model quality.

Main Methods:

  • Hierarchical protocol combining multiple threading alignments and iterative structural assembly.
  • Atomic-level structure refinement.
  • Structure-based function inference using sequence and structure profile comparisons.

Main Results:

  • I-TASSER generates full-length atomic structural models for proteins.
  • Predicts biological functions including ligand-binding sites and enzyme commission numbers.
  • Offers freely available online server and stand-alone package.

Conclusions:

  • I-TASSER is a comprehensive tool for protein structure and function prediction.
  • Provides a user-friendly approach for interpreting results and improving modeling.
  • Facilitates research in structural bioinformatics and computational biology.