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Related Concept Videos

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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Protein Organization01:13

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Protein Folding01:22

Protein Folding

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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
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Protein and Protein Structure02:15

Protein and Protein Structure

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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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Globular and Fibrous Proteins02:21

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Many proteins can be classified into two distinct subtypes - globular or fibrous. These two types differ in their shapes and solubilities.
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Optimization of Synthetic Proteins: Identification of Interpositional Dependencies Indicating Structurally and/or Functionally Linked Residues
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NAHAL-Flex: A Numerical and Alphabetical Hinge Detection Algorithm for Flexible Protein Structure Alignment.

Samira Fotoohifiroozabadi, Mohd Saberi Mohamad, Safaai Deris

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    |May 24, 2017
    PubMed
    Summary
    This summary is machine-generated.

    This study introduces NAHAL-Flex, a novel text-based method for detecting protein hinge regions crucial for understanding protein flexibility. NAHAL-Flex offers a faster and more accurate approach compared to existing 3D structure-based methods.

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    Area of Science:

    • Biophysics
    • Computational Biology
    • Structural Bioinformatics

    Background:

    • Protein flexibility is key to protein function and requires identification of hinge regions.
    • Existing methods for hinge detection are computationally intensive due to reliance on 3D protein structures.

    Purpose of the Study:

    • To develop a computationally efficient, text-based method for detecting protein hinge regions.
    • To introduce NAHAL-Flex, a novel approach for protein flexibility analysis.

    Main Methods:

    • Encoding protein structures into protein folding shape codes (PFSC), a type of structural alphabet (SA).
    • Utilizing dynamic programming (DP) to find alignment paths and identify distorted sequences indicating flexibility.
    • Employing a genetic algorithm (GA) to refine and select optimal hinge positions.

    Main Results:

    • NAHAL-Flex demonstrated comparable performance to state-of-the-art methods on small datasets.
    • On large datasets, NAHAL-Flex outperformed established alignment methods like DaliLite, Matt, DeepAlign, and TM-align in speed and accuracy.

    Conclusions:

    • NAHAL-Flex provides an efficient and accurate alternative for detecting protein hinge regions.
    • The text-based approach significantly reduces computational complexity in protein flexibility analysis.