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Structure and Properties of Peptides

Structure and Properties of Peptides
Which hemoglobin chain replaces the beta chain in embryonic hemoglobulin?

Alfa
Epsilon
Delta
Gamma

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Structure and Properties of Peptides
The same peptide, Val-Lys-Glu-Met-Ser-Trp-Arg-Ala. was digested with chymotrypsin to produce

Val-Lys-Glu-Met-Ser + Trp-Arg-Ala.
Val-Lys + Glu-Met-Ser + Trp-Arg-Ala.
Val-Lys-Glu-Met + Ser-Trp-Arg-Ala.
Val-Lys-Glu-Met-Ser-Trp + Arg-Ala.

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Structure and Properties of Peptides
In β-pleated sheet structures neighbouring

chains lie in a flat plane
neighboring chains are connected by a-helices
neighboring residues are hydrogen bonded
neighboring chains are hydrogen bonded

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Structure and Properties of Peptides
The resonance structures that can be drawn for the peptide bond indicate that the peptide bond

is still not completely understood
is stronger than an ordinary single bond
has partial double bond character
both (a) and (b)

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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
usually trans unless proline is the next amino acid
is planar because of steric hinderance

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

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

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