Carbamylphosphate synthetases in human liver

A sensitive direct colourimetric method has been employed to measure kinetic parameters and pH dependence of carbamyl phosphate synthetase-I, in a liver sample from a 2 1/2-month-old girl, who died from complications of a late-developing congenital hyperammonaemia. The residual activity of carbamyl phosphate synthetase-I was 25%, whereas other urea cycle enzymes were within normal range. Apparent Km for ammonium ion (0.73 mmol/L) was significantly increased (normal range 0.24-0.51). Km for bicarbonate ion was normal, while Km for NAG showed a slight variation from normal. The pH dependence curve of the patient's enzyme was flat, as compared to two controls showing pH optima at 7.8. Radial immunodiffusion (Mancini) of the abnormal enzyme against human enzyme antiserum gave a cross-reacting material of 10-20%. The methodological approach presented can be used to characterize abnormal enzymes in cases of partial deficiency with only 100-200 mg of liver tissue.

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Kinetic abnormalities of carbamyl phosphate synthetase‐I in a case of congenital hyperammonaemia

Qureshi¹,

Letarte²,

Ouellet³

et al. 1985

J of Inher Metab Disea

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KINETIC ABNORMALITIES OF CARBAMYL PHOSPHATE SYNTHETASE CPS-I) IN A CASE OF CONGENITAL HYPERaMMONEMIA

et al. 1984

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Carbamylphosphate synthetases in human liver

Cited by 2 publications

References 10 publications

Kinetic abnormalities of carbamyl phosphate synthetase‐I in a case of congenital hyperammonaemia

Kinetic abnormalities of carbamyl phosphate synthetase‐I in a case of congenital hyperammonaemia

KINETIC ABNORMALITIES OF CARBAMYL PHOSPHATE SYNTHETASE CPS-I) IN A CASE OF CONGENITAL HYPERaMMONEMIA

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