Alpha helix

"The alpha helix is one of the most common secondary structures in proteins. Amino acid side chains project outwards from the polypeptide backbone that forms the core of the helix. The chain is stabilized in this conformation by hydrogen bonds between the backbone amino group of one amino acid and the backbone carbonyl group of another amino acid that is four positions away. These interactions do not involve side chains. Thus
many different sequences can adopt an a helical structure. Alpha helices are regular cylindrical structures. One full turn occurs every 3.6 residues and extends the length of the helix by approximately 0.5 nm. Secondary structures are often represented in cartoon form to clarify the underlying structure of a protein. In this representation, the twisted 3D ribbon follows the path of the peptide backbone."

Essential Cell Biology, Second Edition
by Alberts, Bray, Hopkin, Johnson, Lewis, Raff, Roberts, Walter
copyright 2004 by Garland Science Publishing

Category:

Science & Technology

Tags:

• Alpha
• helix
• amino
• acid
• secondary
• structure
• polypeptide
• backbone
• residue
• hydrogen
• bond
• h-bond
• ribbon
• diagram
• cell
• biology
• biochemistry
• science

[fckzzz20]

very nice 

[mindg8]

Very nice voice...

[MA3ZOOZ93]

thnx

[Amorquies]

thank you~

[h5348227]

لا اله الا الله ..سبحان الله شكرا لصاحب الفيديو

[MrLanine]

but this one is left-hand side..butb alpha helix should be right-hand side..isn't it..?

[emmatey]

make sense

[reannan1462]

This was very well done. I would like to see a video that illustrates how an alpha helix transforms to a beta sheet. That would be very helpful. Thank you again.

[phallyvin]

nice work!!!