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proteins - Coggle Diagram
proteins
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structure of amino acid
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R group - only thing that changes between amino acids, it determines which amino acids it is
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Globular proteins
Haemoglobin
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there are hydrophilic R-groups that point outwards & hydrophobic R-group that point inwards that contribute to spherical/3D shape
Haem group
a non-protein, called a prosthetic group - a prosthetic group within a protein is called a conjugated protein (protein & non-protein as part of its molecule)
Fe^2+ can combine with a single O2 molecule making a total of 4O2 molecules (8 O atoms). Oxyhaemoglobin will be bright red in colour)
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they roll up almost spherical, hydrophobic R-groups turn inwards, they tend to be very soluble & generally they are enzymes & hormones
Insulin
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x2 polypeptide chains called A & B, held together by 2 disulphide bonds
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amino acids with hydrophobic R-groups are found on the outside, this helps it be more soluble in water
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bovine insulin differs from human by 3 amino acids, it does have an effect but not a very big one - you'd need a lot of it
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Pepsin
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it has very few basic R-groups but many acidic R-groups - so its stable in acid environments (stomach)
H^ ions won't be accepted easily, so it won't be denatured in low PH
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Fibrous proteins
Collagen
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3 chains wound around each other to form a triple helix, held in parallel by H bonds, making a collagen molecule
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