beta strand

Question 1

Two things that should come IMMEDIATELY to mind about beta strands

Answer 1

1) less stable than alpha helixes
2) are intrinsically sticky
3

Question 2

Why are beta strands sticky?

Answer 2

They have R groups that “hang” from them, allowing them to participate in hydrogen bonding

Question 3

how long is a beta strand?

Answer 3

4-5 residues

Question 4

what’s a beta sheet?

Answer 4

at least two beta strands, between 2-22

Question 5

Key difference between hydrogen bonding in an alpha helix compared to a beta strand

Answer 5

1) backbone h bonding is perpendicular to the strand of the sheet

Question 6

torsional angles in the beta strand

Answer 6

-180 and 180 of phi and psi, connected perpendicular to the strands

Question 7

distance between amino acids in a beta strand

Answer 7

7 angstroms.

Question 8

instability of beta strands

Answer 8

lack of tight packing, and “hanging” h bonds on side of chain that doesn’t have anyone to bond to

Question 9

bonding structure of amino acids in the beta turn

Answer 9

i + (i+3)

Question 10

what will i+1 be in a beta turn?

Answer 10

proline, doesn’t have a back bone h bond to it’s rigid

Question 11

Where would you find helices and beta strands?

Answer 11

globular proteins