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Protein Organization01:13

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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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.
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Conservation of Protein Domains Over Different Proteins02:26

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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 new super-secondary protein structure: the alpha alpha-angle].

A V Efimov

    Molekuliarnaia Biologiia
    |November 1, 1984
    PubMed
    Summary

    This study introduces alpha alpha-corners, a novel protein super-secondary structure. Specific amino acid sequences are essential for forming these structures, influencing protein folding.

    Area of Science:

    • Protein structure and bioinformatics
    • Biophysics and molecular biology

    Context:

    • Proteins feature diverse super-secondary structures crucial for their function.
    • Alpha alpha-corners represent a specific, locally ordered protein motif.

    Purpose:

    • To define and characterize a novel super-secondary structure termed the alpha alpha-corner.
    • To investigate the structural and sequence requirements for alpha alpha-corner formation.

    Summary:

    • The paper describes a novel super-secondary structure, the alpha alpha-corner, composed of two connected alpha-helices.
    • This structure exhibits a specific conformation and requires a defined pattern of hydrophobic, hydrophilic, and glycine residues in its amino acid sequence.
    • The alpha alpha-corner can serve as a foundational element for the packing of other alpha-helices in a protein molecule.

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    Impact:

    • Provides insights into the fundamental principles of protein folding and architecture.
    • Contributes to understanding the relationship between amino acid sequence and protein structure.
    • May inform future protein design and engineering efforts.