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12 Cards in this Set
- Front
- Back
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Protein functions examples |
Form Chanel’s in plasma membrane, carry message across cells, relay signals inside a cell, and serve as machines with moving parts peptide |
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Peptide bonds |
Amino group of 1 amino acid forms bond with carboxy (COOH) group of another |
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The four bonds of proteins? |
Van Dee waals attractions, hydrogen bonds, ionic bonds, and hydrophobic bonds |
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Secondary structure in proteins |
Alpha helices and beta sheets |
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If the bonds are most common in proteins they must arise from what interactions between which parts of amino acids? |
Hydrogen bonds between n-h and c=o groups in the polypeptide backbone |
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Alpha helices |
R side chain sticks outer, perfected structure without other interactions, hydrogen bonds between nh c=o, 3.6 amino per turn, common in hydrophobic portions of membrane proteins |
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Beta sheets |
Aligned in similar orientation also held together by hydrogen bonds in polypeptide backbone. Anti-parallel |
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Protein domain |
A substructure formed by any part of the polypeptide chain that can fold independently into a stable structure |
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Fibrous protein |
Long and thin, often have structural functions, examples: collagen, elastin, and keratin Rope like |
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Globular proteins |
Short and interspersed runs of secondary structure, often have enzymatic functions. A blob of strands |
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Enzymes |
Accelerate chemical reactions, lowers energy level required for conversion of substrate or reactants to product |
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Enzyme substrate interactions |
Lock and key Induced fit |
