Secondary Structures Flashcards by Molly Gallagher

Q

what is an alpha helix

A

peptide backbone twists

each AA bonds to an AA n+4 away

~3.6 AA/turn

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Q

common themes in alpha helices

A

proline impossible (rigidity)

glycine rare (flexibility)

~20 NP in a row is transmembrane

(-) charge 3-4 AA away from (-) is rare

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Q

helical wheel

A

helps determine amphipathic alpha helix

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Q

beta sheets can be

A

antiparallel

parallel

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Q

common themes of beta sheets

A

alternating NP/P groups = amphipathic

proline not possible in middle (rigidity)

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Q

if antiparallel beta sheet #atoms involved

A

alternating 10/14

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Q

if parallel beta sheet #atoms involved

A

12

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Q

disulfide bonds

A

form between two cysteines (covalently) NP

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