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Peptide, ☆Peptides are short chains of amino acids linked by chemical…
Peptide
Structures
Tertiary
Weak Interactions: Hydrogen bonds, Ionic bonds, Hydrophobic interactions & Van der Waals forces
determined by a variety of interactions (bond formation) among R groups and between R groups and the polypeptide backbone
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Primary
A protein's primary structure is determined by the sequence of amino acids, like lysozyme (129 amino acids), with N- and C-termini, held together by intramolecular hydrogen bonds.
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Secondary
α-helix
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Hydrogen bonding in α-helix: In the α-helix CO of the one amino
acid residue forms H-bond with NH of the forth one.
β-sheets
Structures where multiple polypeptides or segments are linked by hydrogen bonds between different chains or segments.
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Quaternary
results from the aggregation (combination) of two or more polypeptide subunits held together by non-covalent interaction like H-bonds, ionic and hydrophobic interactions.
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Examples of Dipeptides
• Carsonine
•Anserine
•Homoanserine
•Kyotorphin
•Balenine
•Aspartame
•Glorin
•Barettin
•Pseudoproline
•Glycylglycine
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☆Peptides are short chains of amino acids linked by chemical bonds called peptide bonds
☆They are the building blocks of proteins, and a protein consists of one or more polypeptides
☆Peptides are resistant to conditions that denature proteins, such as elevated temperatures and high concentration of urea
☆They are named based on the number of amino acid residues in the sequence, and a peptide chain
☆The chains containing less than 50 amino acids
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