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Related Concept Videos

Protein Networks02:26

Protein Networks

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An organism can have thousands of different proteins, and these proteins must cooperate to ensure the health of an organism. Proteins bind to other proteins and form complexes to carry out their functions. Many proteins interact with multiple other proteins creating a complex network of protein interactions.
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Protein families are groups of homologous proteins; that is, they have similarities in amino acid sequences and three-dimensional structures. Protein families usually occur because of gene duplication, where an additional copy of a gene is inserted into the genome of an organism.   Mutations that change the amino acids but still allow the protein to be properly synthesized, will lead to new protein family members.   If these new proteins contain similar amino acids in key...
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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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Conserved Binding Sites01:49

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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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The native conformation of a protein is formed by interactions between the side chains of its constituent amino acids. When the amino acids cannot form these interactions, the protein cannot fold by itself and needs chaperones. Notably, chaperones do not relay any additional information required for the folding of polypeptides; the native conformation of a protein is determined solely by its amino acid sequence. Chaperones catalyze protein folding without being a part of the folded protein.
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Author Spotlight: A Computational Approach to Decipher Amino Acid Preferences in Multispecific Protein-Protein Interactions
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Predicting aggregation-prone sequences in proteins.

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    Protein aggregation, linked to diseases, is driven by intrinsic aggregation-prone regions (APRs). Understanding these APRs is key to studying protein aggregation and developing new therapeutic strategies.

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    Area of Science:

    • Biochemistry and Molecular Biology
    • Structural Biology
    • Disease Mechanisms

    Background:

    • Protein aggregation is implicated in numerous human diseases.
    • Protein aggregation tendency is influenced by folding efficiency, stability, sequence propensity, and quality control.
    • Intrinsic aggregation propensity is linked to short aggregation-prone regions (APRs).

    Purpose of the Study:

    • To review methods for identifying aggregation-prone regions (APRs) in polypeptide sequences.
    • To discuss the methodological basis and practical applications of APR identification.

    Main Methods:

    • Review of computational and experimental approaches for APR detection.
    • Analysis of sequence features associated with APRs (hydrophobicity, charge, beta-structure propensity).

    Main Results:

    • Aggregation-prone regions (APRs) are short segments (5-15 amino acids) with high hydrophobicity and beta-structure propensity.
    • The presence of APRs is a prerequisite for protein aggregation.
    • Various methods exist to identify APRs in protein sequences.

    Conclusions:

    • Identifying APRs is crucial for understanding protein aggregation.
    • Methodological advancements aid in predicting and analyzing aggregation-prone regions.
    • APR identification has practical applications in disease research and drug development.