Amino acids aspartic and glutamic acid

The relationship of the dicarboxylic amino acids, aspartic and glutamic acids to this process has also been studied (106). This investigation has been facilitated by a quantitative method for the codetermination (23) of the dehydrogenation indicator, resazurin, and its reduction product, resorufin. The wood destroying molds used were Trameles cinnabarina and Lentinus lepideus. 

Sowden et al. [4] also did detailed amino acid and amino sugar analyses of the soils from the different dimatic regions. The following amino acids were determined acidic amino acids aspartic and glutamic acids basic amino acids arginine, histidine, lysine and ornithine neutral amino adds, phenylalanine, tyrosine, glycine, alanine, valine, leudne, isoleudne, serine, threonine, proline and hydroxyproline ... 

Some amino acids have side chains that bear acidic or basic groups. As Table 27.3 indicates, these amino acids are characterized by three pK.d values. The third pKd reflects the nature of the side chain. Acidic amino acids (aspartic and glutamic acid) have acidic side chains basic amino acids (lysine, arginine, and histidine) have basic side chains. 

Most of these compounds have two carboxyl groups, as in the protein amino acids, aspartic and glutamic acid. Both aspartic and glutamic acids are universally distributed as protein constituents. Flowever, the majority of acidic NPAAs are structurally related only to glutamic acid or to glutamine. The... 

Mauritzen and Stedman (1959, 1960) found slight but definite tissue differences in the amino acid composition of nuclear histones isolated from different organs. These differences concerned only some amino acids (aspartic and glutamic acids, alanine, leucine, isoleucine, and valine). They postulate that histones may be tissue-specific proteins. The relative quantities of the same histone fractions also differ appreciably from one tissue to another. 

---