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Structure and Properties of Peptides

Structure and Properties of Peptides
Heme is the binding pocket of myoglobin and hemoglobin and is composed of

positively charged residues
polar residues
negatively charged residues
hydrophobic residues

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Structure and Properties of Peptides
In the β-pleated sheet

the polypeptide chain is fully extended
All of these
hydrogen bonds are formed between the peptide bonds
adjacent polypeptide chains can either be parallel or antiparallel

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Structure and Properties of Peptides
The peptide bond in proteins is

usually cis unless proline is the next amino acid
only found between proline residues
is planar because of steric hinderance
usually trans unless proline is the next amino acid

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Structure and Properties of Peptides
What was the first protein whose complete tertiary structure was determined?

Myoglobin
Pancreatic DNase
Pancreatic ribonuclease
Lysozyme

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Structure and Properties of Peptides
The oxygen binding curves of hemoglobin and myoglobin

both (a) and (b)
are a consequence of the quaternary structure of hemoglobin
are identical
allow maximum transfer of oxygen to the tissues

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Structure and Properties of Peptides
Peptides in the fully extended chain conformation

also have a cis geometry in their peptide bonds
do not occur in nature
are equivalent to the (3-sheet structure
have Y = F = 180°

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