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Structure and Properties of Peptides

Structure and Properties of Peptides
The heme is held in place by a bond between

the Fe2+ and cysteine
the Fe3+ and cysteine
the Fe3+ and histidine
the Fe2+ and histidine

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Structure and Properties of Peptides
Hydrogen bonds in a-helices are

roughly parallel to the helix axis
more numerous than Vander Waals interactions
not present at Phe residues
analogous to the steps in a spiral staircase

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Structure and Properties of Peptides
In the β-pleated sheet

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

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Structure and Properties of Peptides
Disulfide bonds most often stabilize the native structure of

intracellular proteins
extracellular proteins
dimeric proteins
hydrophobic proteins

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Structure and Properties of Peptides
When pO2 = Kd of myoglobin, the fractional saturation (YO2) is about

0.9
0.1
0.5
1.7

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Structure and Properties of Peptides
What is the effect of a decrease in pH on hemoglobin oxygen affinity?

Decrease in oxygen affinity
Increase affinity in muscle cell otherwise decrease
No effect on oxygen affinity
Increase in oxygen affinity

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