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Helix Classifications

  1. Oct 12, 2009 #1
    Hi folks,

    I'm confused about classifying alpha helices. I don't understand how a 3.613 and a 310 helix differentiate.... Well, I know that a 3.613 helix has 3.6 residues per turn and 13 atoms in between each hydrogen bond (I think)?
    Likewise a 310 helix has 3 residues per turn and 10 atoms in between each hydrogen bond (I think)?
    But what confuses me is that despite these classifications in both helices the N and N+4th residues are hydrogen bonded? So in a 3.613 helix 13 atoms span the distance between hydrogen bonds but the 1st and 5th residues (for example) would be linked via hydrogen bond (with 13 atoms in between the hydrogen bond)?

    so it'd look something like this, on an atomic level (0's are the h-bonded atoms)?

    0-1-2-3-4-5-6-7-8-9-10-11-12-13-0

    Am I reading too deeply into this?

    Thanks,

    -ice
     
  2. jcsd
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