secondary structure

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23 Terms

1
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what are the 2 types of secondary structure

alpha helix and beta sheets

2
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decsribe the structure of an alpha helix

like a coil, right handed helix

3
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how many residues

3.6 residures each turn

4
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what do the 3.6 residues per turn mean for the side chains

they are all at 100 degrees from eachother

5
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what bonds are presnent and where are they

hydrogen bonding within the backbone residues

6
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which directions do the side chains project from, what does this allow

outwards, allows them to interact with other things

7
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what do the hydrogen bonds form

cross turns

8
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whats the rule for cross turns

n - n+4 links (1 in bound to 5, 2 is bound to 6 ect)

9
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what do the cross turns result in

stabilisation of the aplha helix

10
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what are helix formers, give example

amino actids that are likly to form alpha helix, glutamate

11
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what are helix destabalisers, give example

aa. that can be in alpha helixes but if theres lots of them they will disrupt, tyrosine

12
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what are helix breakers

theyre almost never found in alpha helixes, proline

13
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why are helix breakers never found in alpha helixes

the r group has bonded back to the amino acid so none of the bonds can rotate(phi bond)

14
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what are th 2 types of beta pleated sheets

parralel and anti parralell

15
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whats the structure of the antiparralel strand

c to n and then n to c

16
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where does the hydrogen bonding occour in the antiparrallel sheets

between the o and the h, relitivly straight bonds

17
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what does the hydrogen bonding allow for

more thn 2 sheets to be involved- some protiens have extensive numbers of sheets

18
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whats an example of anitparralel beta sheets

silk- repetitive of glycine and alanine

19
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where are the r groups on the sheets

up and down away form the sheet

20
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whats the formation of parralel pleated sheets

n to c and n to c

21
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what does the structure of the parallel sheet result in

less strenghts as the bonds arnt straight

22
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where does the hydrogen bonding occour in all secondary structures

between backbons and backbone

23
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what is a structural motife

arrangement of the secondary structures repetedly