1
Q
Peptide length
A
<10 AA
2
Q
Polypeptide length
A
10>x>100 AA
-“polypeptide chain” refers to any size
3
Q
About proline
A
- side chain connects to alpha amino group, results in 5-membered ring
- this limits possible structural conformations (is rigid)
4
Q
About methionine
A
-contains a thioether group (C-S-C)
R group is CH2CH2SCH3
5
Q
About Cysteine
A
- Has a sulfhydryl group
- 2 cysteine residues close together can form disulfide bond, improves stability
- are important for catalytic functions, SH is a good nucleophile
- R group is CH2SH
