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Peptides and proteins Part 2

Peptides and proteins Part 2 - Collagen connective tissue...

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Collagen connective tissue protein The repeating unit: (Gly-X-Pro) or (Gly-X-Hyp) Three individual helices are twisted around each other to form a stiff rod. Triple helical molecule ics called tropocollagen. The three strands are held together by hydrogen bonds.
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Cross-link in collagen
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Cross-link in elastin
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Silk fibroin The regularly repeating sequence: (Ser-Gly-Ala-Gly) n Antiparallel pleated sheet
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Structure of proteins - Tertiary – includes the three-dimensional arrangement of all atoms in the protein, including the atoms in the side chains and any prosthetic groups (ones other than amino acids) - In very large proteins, the folding of parts of the chain can occur independently of the foldinf of other parts. Such independently folded portions of proteins are referred to as DOMAINS - Forces stabilizing – hydrogen bonds between side chains, electrostatic attractions (salt, ionic bonds), hydrophobic interactions,
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