Helices

hi all How do predict what types of secondary structure (left alpha helices, right alpha helices, parallel beta sheet, anti parallel beta sheet) from amino acid sequence? Reply as soon as possible

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What is the main difference of helices in a heterogeneous protein compared to homogeneous protein, other than the propensity for helices being sequence dependent. Relate it to the coil-helix transition, fractional helicity and melting temperature.

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You need to determine, which segments are membrane-spanning helices. The rest are the extra-membranous loops. What I remember about 7TM proteins, one of them should be considerably longer and that's the one you are looking for ;)

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... means the beta sheet, I think it's marked E) However, there are more secondary structures, than just alpha-helix and beta-sheet. There are several helices (e.g. pi-helix, left-handed helix etc.), also several turns etc. Anyway, the primary structure says only the sequence, as above.The secondary ...

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... PrositeScan. If you look for some signals as cleavage sites and postranslational modifications or wonder if your protein contains trans-membrane helices, try the applications on: http://www.cbs.dtu.dk/services/

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