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protein structure Flashcards

secondary structure: distinguish between an α-helix and a β-pleated sheet and appreciate the bonds that stabilise their formation (7 cards)

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1
Q

how is the a-helix stabilised

A

hydrogen bonds between NH and CO of different residues

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2
Q

how many amino acids along the helix

A

4

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3
Q

what a-helix is more stable

A

right-handed

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4
Q

which direction do the side chains project

A

out

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5
Q

why does proline form a kink

A

NH lost, so can’t hydrogen bond with CO, forming kink

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6
Q

how is the B-pleated sheet stabilised

A

hydrogen bonds between NH and CO (at right angles to backbone) of 2 or more B-strands

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7
Q

why might it be parallel or antiparallel

A

depends on best hydrogen bond alignement

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