Abstract
The kinetics and mechanism of the reactions of pyridoxal with L- and D-α-alanine were studied. Under comparable conditions, the condensation of L- and D-α-alanines with pyridoxal includes three kinetically different steps. The first fast step is addition of the amino acid to pyridoxal with formation of the corresponding amino alcohol, the second (slower) step is dehydration of the amino alcohol to give Schiff base, and the third (very slow) step is elimination of α-hydrogen atom from the L-α-amino acid fragment or decarboxylation of the D-α-amino acid fragment, followed by isomerization of the Schiff base to quinoid structure whose subsequent hydrolysis yields pyridoxamine and pyruvic acid or acetaldehyde, respectively. A scheme was proposed for chemical transformations of the pyridoxal condensation products with L- and D-α-alanines.
Similar content being viewed by others
References
Metzler, D.E., Biochemistry: The Chemical Reactions of Living Cells, New York: Academic, 1977. Translated under the title Biokhimiya, Moscow: Mir, 1980, vol. 2, p. 209.
Braushtein, A.E. and Shemyakin, M.M., Biokhimiya, 1953, vol. 18, no. 4, p. 393.
Pishchugin, F.V. and Tuleberdiev, I.T., Russ. J. Gen. Chem., 2005, vol. 75, no. 9, p. 1465.
Pishchugin, F.V. and Shershenalieva, Z.Sh., Biokhimiya, 1988, vol. 53, no. 9, p. 1509.
Dunathan, H.C., Adv. Enzymol. Relat. Areas Mol. Biol., 1971, vol. 35, p. 79.
Bailey, G.E., Chotamangsa, O., and Vuttirej, K., Biochemistry, 1970, vol. 9, no. 16, p. 3243.
Shye, G.E., Potts, R., and Floss, H.G., J. Am. Chem. Soc., 1974, vol. 96, no. 5, p. 1593.
Metzler, D.E. and Harris, J.A., Biochemistry, 1973, vol. 12, no. 26, p. 5377.
Laidler, K.J., Reaction Kinetics, Oxford: Pergamon, 1963. Translated under the title Kinetika organicheskikh reaktsii, Moscow: Mir, 1966, p. 31.
Author information
Authors and Affiliations
Corresponding author
Additional information
Original Russian Text © F.V. Pishchugin, I.T. Tuleberdiev, 2009, published in Zhurnal Obshchei Khimii, 2009, Vol. 79, No. 1, pp. 120–123.
Rights and permissions
About this article
Cite this article
Pishchugin, F.V., Tuleberdiev, I.T. Chemical transformations of the condensation products of pyridoxal with L-α-alanine and D-α-alanine. Russ J Gen Chem 79, 117–120 (2009). https://doi.org/10.1134/S1070363209010174
Received:
Published:
Issue Date:
DOI: https://doi.org/10.1134/S1070363209010174