Abstract
The effect of various sulfur-containing amino acids on the activities of prolidase isoenzymes I and II isolated from erythrocytes of healthy individuals, and erythrocyte lysates from a patient with prolidase deficiency was investigated. The activity of prolidase I against glycylproline was strongly enhanced by d-methionine. l-Methionine and d,l-methionine slightly enhanced the activity at low concentration, but N-acetyl-l-methionine had no effect. d-Ethionine, l-ethionine, and d,l-ethionine also enhanced the activity of prolidase I. d,l-Homocysteine enhanced the activity at low concentration, but inhibited the activity at 50 mM. The activity of prolidase II against methionylproline was enhanced by d-methionine, d,l-methionine, and l-methionine, but N-acetyl-l-methionine had no effect. d-Ethionine and d,l-ethionine strongly enhanced the activity of prolidase II compared with l-ethionine; d,l-homocysteine weakly enhanced the activity. d,l-Homocysteine-thiolactone inhibited the activities of prolidase I and II in a concentration-dependent manner. The effect of various sulfur-containing amino acids on prolidase activity against methionylproline in erythrocyte lysates from a patient with prolidase deficiency was almost the same as that on prolidase II. The kinetics of the activities of prolidase I, II, and patient prolidase were also studied. Their K m values were changed by adding sulfur-containing amino acids, but V max values were unchanged.
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We would like to thank Professor Hajime Kodama, Department of Dermatology, Kochi Medical School, for supplying the erythrocytes from a patient with prolidase deficiency.
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Uramatsu, S., Liu, G., Yang, Q. et al. Characterization of prolidase I and II purified from normal human erythrocytes: comparison with prolidase in erythrocytes from a patient with prolidase deficiency. Amino Acids 37, 543–551 (2009). https://doi.org/10.1007/s00726-009-0262-7
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DOI: https://doi.org/10.1007/s00726-009-0262-7