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-   -   The third amino acid in the peptidoglycan cross-linking tetra-peptide chain? (http://www.molecularstation.com/forum/peptide-forum/87710-third-amino-acid-peptidoglycan-cross-linking-tetra-peptide-chain.html)

Josh 03-10-2013 02:16 PM

The third amino acid in the peptidoglycan cross-linking tetra-peptide chain?
 
The third amino acid in the peptidoglycan cross-linking tetra-peptide chain is either diaminopimelic acid, or lysine.
These amino acids are located in this position because the amino acid must:
Answer

Be positively charged for a salt bridge to form.

Have two free amino groups.

Be hydrophilic.

Have a large R-side chain to fill space in the cell wall.

All of the above are required.


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