Summary
By means of a simultaneous azo coupling method N-acetyl-β-galactosaminidase has been detected preponderantly in the lysosomes of various organs (e.g. epididymis, spleen, kidney, liver, intestine and brain) from mice, guinea-pigs and rats.
The recommended incubation medium consists of 3.0–5.0 mg naphthol AS-BI N-acetylβ-galactosaminide (dissolved in ethylene glycol monomethyl ether) and 0.5–1.0 ml hexazonium-p-rosaniline in 10 ml 0.05 M citrate or citric acid-phosphate buffer, pH 4.0.
Parallely, N-acetyl-β-glucosaminidase has been demonstrated with the same assay replacing the naphthol AS-BI N-acetyl-β-galactosaminide by the corresponding glucosaminide.
In principal both enzymes displayed an identical distribution pattern and were inhibited to a similar extent by N-acetyl-β-glucosamine and N-acetyl-β-galactosamine or by the corresponding lactone. The activity of glucosaminidase, however, was always higher in comparison with β-galactosaminidase. Therefore some evidence occurs also from the histochemical point of view that β-galactosaminidase and β-glucosaminidase may represent one single lysosomal enzyme which preferentially attacks N-acetyl-β-glucosaminides.
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Gossrau, R. On the histochemical demonstration of N-acetyl-β-galactosaminidase. Histochemie 29, 315–324 (1972). https://doi.org/10.1007/BF00279814
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DOI: https://doi.org/10.1007/BF00279814