Polyethylene Glycol–Modified Papain Catalyzed Oligopeptide Synthesis from the Esters ofl-Aspartic andl-Glutamic Acids in Benzene

Synthesis of the Aspartic and Glutamic Families of Amino Acids in Escherichia Coli.

The Rhodium(III) Complexes of Aspartic and Glutamic Acids

The chelating tendencies of the alpha amino acids with platinum group metal ions are well known; with the dibasic acids, complexes have been reported involving palladium(II) and platinum (II) with both aspartic and glutamic acids. There is no mention of the successful synthesis of complexes between these acids and rhodium (III), however. This communication reports a method of preparation for th...

Determination of aspartic and glutamic acids by enzymatic decarboxylation.

Suspensions of Clostridium welchii (strain SR 12) quantitatively decarboxylate the L isomers of aspartic (1) and glutamic acids (2) to ar-alanine and y-aminobutyric acid, respectively. Although a quantitative procedure for the determination of glutamic acid based upon decarboxylation with this organism has been described (3), it has been found that aspartic acid, especially in the presence of c...

Glutamic Aspartic Transaminase

Aspartate and glutamate react instantaneously with the pyridoxal form of the pig heart glutamic aspartic transaminase (1) to yield the corresponding keto acid, converting the enzymebound pyridoxal phosphate to bound pyridoxamine phosphate (2). Other amino acids such as methionine sulfoxide, methionine sulfone, and alanine react much more slowly with the enzyme, but the reaction itself appears t...

Papain Catalyzed (co)Oligomerization of α-Amino Acids

Four hydrophobic amino acids (Leu, Tyr, Phe, Trp) were oligomerized by the protease papain in homo-oligomerization, binary co-oligomerization and ternary co-oligomerization. After 24 h, solid polydisperse reaction products of the homo-oligomerization were obtained in yields ranging from 30–80% by weight. A DPavg was calculated based on MALDI-ToF MS results using the ion counts for the chains in...