Illustrate Hydrogen Bonding: Amino Acids

  • #1
MightyMan11
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Homework Statement


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?


Homework Equations


Picture2.png



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.
 

Answers and Replies

  • #2
Ygggdrasil
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Which atoms have hydrogen capable of forming hydrogen bonds?
 
  • #3
MightyMan11
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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
 
  • #4
Ygggdrasil
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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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