Characterization of the Isoenzyme Profile of β-N-Acetylhexosaminidase in the Urine of Newborns
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Luis F. Pérez
Abstract
The urinary isoenzymes of β-N-acetylhexosaminidase (Hex) in newborn infants were characterised by chromatography, electrophoresis, thermodynamic analysis and through substrate specificity. No qualitative difference was found for the major Hex A and Hex B isoenzymes between full-term or premature newborns and adults, although in the latter group the relative proportion of Hex B is much lower (18.5 ± 2.7 % vs. 36.3 ± 1.0 %). An additional minor enzyme form was found in some premature newborns, which eluted from the DEAE-cellulose column at a higher concentration of NaCl than Hex A and, like this isoenzyme, is able to hydrolyse 4-methylumbellipheryl-2-acetamido-2-deoxy-β-D-glucopyranoside-6-sulphate, which would suggest that it has α subunits in its molecule. These results do not confirm the hypothesis of other authors about the existence of a unique fetal Hex isoenzyme in neonatal urine which eluted before the application of the NaCl gradient, similarly to the Hex B.
Copyright © 1999 by Walter de Gruyter GmbH & Co. KG
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- Clinical Laboratory Diagnostics. Thomas Lothar, editor
- Structure-based Ligand Design. Klaus Gubernator and Hans-J. Böhm, editors (Methods and Principles in Medicinal Chemistry, vol. 6.)
Articles in the same Issue
- Development of Molecular Genetics
- The Changing Face of Clinical Laboratories
- Analysis of the Gly40Ser Polymorphism in the Glucagon Receptor Gene in a German Non-Insulin-Dependent Diabetes Mellitus Population
- A Relationship between K-ras Gene Mutations and Some Clinical and Histologic Variables in Patients with Primary Colorectal Carcinoma
- Particle Counting Immunoassay for Urinary Cotinine. Comparison with Chromatography, Enzyme-linked Immunoassay and Fluorescence Polarization Immunoassay
- Identification of IgG-specific Oligoclonal Banding in Serum and Cerebrospinal Fluid by Isoelectric Focusing: Description of a Simplified Method for the Diagnosis of Neurological Disorders
- Low Bone Mineral Density after Total Gastrectomy in Males: a Preliminary Report Emphasizing the Possible Significance of Urinary Net Acid Excretion, Serum Gastrin and Phosphorus
- Six Methods for the Determination of C-Peptide Evaluated
- Automation of Urine Sediment Examination: a Comparison of the Sysmex UF-100 Automated Flow Cytometer with Routine Manual Diagnosis (Microscopy, Test Strips, and Bacterial Culture)
- Characterization of the Isoenzyme Profile of β-N-Acetylhexosaminidase in the Urine of Newborns
- Clinical Laboratory Diagnostics. Thomas Lothar, editor
- Structure-based Ligand Design. Klaus Gubernator and Hans-J. Böhm, editors (Methods and Principles in Medicinal Chemistry, vol. 6.)
