Zwitterionic form of a D-alpha-amino acid having an anionic carboxy group and a protonated amino group.
| Member | Definition | Role |
|---|
| D-leucine | A D-alpha-amino acid zwitterion arising from the transfer of a proton from the carboxy to the amino group of D-leucine; major species at pH 7.3. | D-leucine zwitterion; D-leucine |
| D-proline | A D-alpha-amino acid zwitterion that is D-proline in which a proton has been transferred from the carboxy group to the amino group. It is the major species at pH 7.3. | D-proline zwitterion; D-proline |
| D-tyrosine | A D-alpha-amino acid zwitterion that is D-tyrosine in which a proton has been transferred from the carboxy group to the amino group. It is the major species at pH 7.3. | D-tyrosine zwitterion; D-tyrosine |
| D-valine | A D-alpha-amino acid zwitterion that is D-valine in which a proton has been transferred from the carboxy group to the amino group. It is the major species at pH 7.3. | D-valine zwitterion; D-valine |
| octopine | A D-alpha-amino acid zwitterion that is D-octopine in which both carboxy groups are anionic and the secondary amino and guanidine imino functions are protonated. | D-octopine dizwitterion; D-octopine |
| phenylalanine | A D-alpha-amino acid zwitterion that is D-phenylalanine in which a proton has been transferred from the carboxy group to the amino group. It is the major species at pH 7.3. | D-phenylalanine zwitterion; D-phenylalanine |