T6-HOW CAN AMINO ACIDS CHAINS BUILD A PROTEIN

Question 1

secondary structure of proteins

Answer 1

all interaction are from the elements in the backbone, not the side chains

N-C-C- unit repeating, from N terminus to C terminus

Question 2

parallel beta sheets

Answer 2

chains interact and form H bonds, running in the same direction N–>C

Question 3

anti-parallel beta sheets

Answer 3

C–>N hydrogen bonds are all parallel and arranged nicely and spaced
- more stable than parallel

Question 4

alpha helix

Answer 4

right handed helix
H bonds stabilise helix shape and flexibility

Question 5

turns and loops

Answer 5

turns = short and connecting B sheets or alpha helixes

loops = longer, flexible, amino acids may be involved in catalysis