The Reactions of Phenylglyoxal and Related Reagents with Amino Acids1
- 1 February 1977
- journal article
- research article
- Published by Oxford University Press (OUP) in The Journal of Biochemistry
- Vol. 81 (2), 395-402
- https://doi.org/10.1093/oxfordjournals.jbchem.a131471
Abstract
The reaction of phenylglyoxal (PGO), glyoxal (GO), and methylglyoxal (MGO) with amino acids were investigated at mild pH values at 25°. These aldehydes reacted most rapidly with arginine and the rate of reaction increased with increasing pH values. Histidine, cystine, glycine, tryptophan, asparagine, glutamine, and lysine reacted with these aldehydes at significant but various rates, depending on the pH and the kind of the reagent used. The reactions with these amino acids seemed to involve both the α-amino groups and the side chain groups, and no significant reaction appeared to occur with the side chain alone except with those of arginine, lysine, and cysteine. These reagents were similarly reactive with the guanidinium group of arginine, but PGO appeared to be much less reactive with the ε-amino group of lysine than MGO and GO. The other ordinary amino acids were very much less reactive or did not react at all with these reagents, with the exception of cysteine. D1-PGO-L-arginine was prepared from Nα-benzyloxycarbonyl-L-arginine, and di-PGO-methylguanidine from methylguanidine, and the stoichiometry of the reaction of two PGO molecules with one guanidino group was confirmed. A glyoxal derivative of L-arginine (GO-arginine) was prepared by reaction of glyoxal with arginine. GO-arginine was fairly unstable, especially at higher pH values. A similar derivative (MGO-arginine) was also found to be formed by reaction of MGO with L-arginine, and was similarly unstable. These derivatives, however, did not regenerate arginine upon acid hydrolysis.Keywords
This publication has 6 references indexed in Scilit:
- Further Studies on the Reactions of Phenylglyoxal and Related Reagents with Proteins1The Journal of Biochemistry, 1977
- On the formation of 2-keto-3-deoxy-d-glucoseBiochimica et Biophysica Acta (BBA) - General Subjects, 1968
- States of Amino Acid Residues in Proteins XIV. Glyoxal as a Reagent for Discrimination of Arginine ResiduesThe Journal of Biochemistry, 1967
- Enzymatic Synthesis and Metabolism of Hydroxypyruvic AldehydeJournal of Biological Chemistry, 1965
- Synthesis and Some Biochemical Properties of Phosphohydroxypyruvic Aldehyde and of 3-Phosphoglyceryl Glutathione Thiol EsterJournal of Biological Chemistry, 1961
- The basic amino-acid content of proteinsBiochemical Journal, 1946