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Clinical Chemistry 21: 230-234, 1975;
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Clinical Chemistry, Vol 21, 230-234, Copyright © 1975 by the American Association for Clinical Chemistry

Serum and Erythrocyte Argininosuccinate Lyase Assay by NADH Fluorescence Generated from Formed Fumarate

John E. Sherwin 1 and Samuel Natelson 1

1 Departments of Pediatrics (J.E.S.) and Biochemistry (S.N.), Michael Reese Medical Center, Chicago, Ill. 60616.

Measurement of argininosuccinase (I; EC 4.3.2.1) activity is useful in following the course of disease in hepatitis and in screening for the genetic defect, argininosuccinic aciduria. Methodology is proposed for a novel procedure for the determination of I in serum and erythrocytes. In the procedure, fumarate, generated in the reaction, is assayed by conversion to malate with fumarase, determining the malate enzymatically with malate dehydrogenase, and estimating the NADH formed spectrofluorometrically. By this procedure, the enzyme activity in serum from normal individuals is less than 11 µmol/liter of serum/per hour. The normal range for this enzyme's activity in erythrocytes is 1120 to 2420 µmol/liter of erythrocytes/per hour. The correlation coefficient between results by this method and by the colorimetric method, which measures the arginine generated in the reaction, is +0.97 for serum and +0.98 for erythrocytes. The proposed procedure has a relatively low initial blank, requires less serum, and is completed faster.


Key Words: liver function • normal values • screening • argininosuccinic aciduria • fluorometry

Accepted on November 19, 1974






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Copyright © 1975 by the American Association for Clinical Chemistry.