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Illustrate Hydrogen Bonding: Amino Acids

  1. Mar 19, 2009 #1
    1. The problem statement, all variables and given/known data
    The following structures illustrate hydrogen bonding interactions between amino acid side chains and/or backbone atoms within a protein structure. In which of the following figures are the structures and hydrogen bonding completely correct?


    2. Relevant equations
    Picture2.png


    3. The attempt at a solution
    Firstly, I know that structure 4 is wrong (does not involve hydrogen).
    A quick glance at my textbook shows that the amino acid with the configuration of -OH shown in structure 3 does not exist, eliminating 3.
    However, I am stuck at 1 & 2 as they seem both correct.
    Any insight would be greatly appreciated.
     
  2. jcsd
  3. Mar 19, 2009 #2

    Ygggdrasil

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    Which atoms have hydrogen capable of forming hydrogen bonds?
     
  4. Mar 19, 2009 #3
    Ah.
    The electronegativity difference between sulphur and hydrogen seems to low to have a hydrogen bond.
    That would leave structure 1 (also nitrogen and hydrogen have an electronegativity difference that is high enough to create a H-bond).

    Thank you,
    Ygggdrasil
     
  5. Mar 20, 2009 #4

    Ygggdrasil

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    Science Advisor

    A good rule of thumb is that only hydrogens bonded to fluorine, nitrogen, or hydrogen atoms are capable of participating in hydrogen bonds.
     
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