Beta pleated sheet vs alpha helix

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Edher
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Beta pleated sheet vs alpha helix

Post by Edher » Sat Jan 29, 2005 6:58 pm

Hello,

What property, in a polypeptide. decides wheter its secundary structure is alpha helix or beta pleated sheet?

Thank You, Edher

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biostudent84
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Post by biostudent84 » Sun Jan 30, 2005 12:44 am

It's the locations of the Carboxyl and Nitrate groups in the chains. They hydrogen bond to each other and form the structure.

Huxdar
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Hydrogen bonding in secondary structure

Post by Huxdar » Tue Oct 10, 2006 11:08 pm

biostudent84 means carboxyl and amino groups (not nitrate). But that doesn't answer the question why a helix rather than a sheet.

oppox
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Post by oppox » Tue Oct 10, 2006 11:27 pm

thats a hard question and its not possible to answer diffenatly. Some aminoacids are said to be for an example helical inducers, like leucine and alanine. proline for an example is often found in hairpins. But there is no rule without exceptions so...

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Post by lara » Sat Oct 14, 2006 9:36 am

excess proline can cause kinking enhancing beta pleat formation while more no: of polar amino acids can result in h-bonding(intramolecular) to form alpha helix

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Dr.Stein
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Post by Dr.Stein » Sun Oct 15, 2006 5:01 am

OMG this thread is killing me :shock: :lol: Ask Victor why :mrgreen:
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