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

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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
The peptide bond in proteins is

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

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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

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

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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
have Y = F = 180°
are equivalent to the (3-sheet structure
do not occur in nature

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Structure and Properties of Peptides
In the β-pleated sheet

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

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