The enzymatic hydrolysis of 6-acylamino-4-methylumbelliferyl-beta-D-glucosides: identification of a novel human acid beta-glucosidase. 1996

M Mikhaylova, and G Wiederschain, and V Mikhaylov, and J M Aerts
Laboratory of Carbohydrate Chemistry, Institute of Biomedical Chemistry, Russian Academy of Medical Sciences, Moscow, Russia.

Fluorogenic 6-acylamino-4-methylumbelliferyl-beta-D-glucosides were found to be poor substrates for the three known human beta-glucosidases, i.e., lysosomal and non-lysosomal glucocerebrosidases and cytosolic broad-specificity beta-glucosidase. However, homogenates of human tissues and human cell types showed significant enzymatic hydrolysis of 6-ethanoylamino-4-methylumbelliferyl-beta-D-glucoside (EMGlc) due to the activity of a hitherto undescribed beta-glucosidase, called here EMGlc-ase. It was shown that the isozyme is hardly active towards 4-methylumbelliferyl-beta-D-glucoside or glucosylceramide. EMGlc-ase exhibits maximal activity at pH 4.5 and 5.0 in the absence and presence of sodium taurocholate respectively. It is a soluble lysosomal enzyme with a discrete isoelectric point of about 5.0. EMGlc-ase is not inhibited by conduritol B-epoxide, is activated by sodium taurocholate and binds strongly to Concanavalin A. This enzyme is not deficient in relation to Gaucher disease.

UI MeSH Term Description Entries
D007526 Isoelectric Point The pH in solutions of proteins and related compounds at which the dipolar ions are at a maximum. Isoelectric Points,Point, Isoelectric,Points, Isoelectric
D007668 Kidney Body organ that filters blood for the secretion of URINE and that regulates ion concentrations. Kidneys
D008099 Liver A large lobed glandular organ in the abdomen of vertebrates that is responsible for detoxification, metabolism, synthesis and storage of various substances. Livers
D008247 Lysosomes A class of morphologically heterogeneous cytoplasmic particles in animal and plant tissues characterized by their content of hydrolytic enzymes and the structure-linked latency of these enzymes. The intracellular functions of lysosomes depend on their lytic potential. The single unit membrane of the lysosome acts as a barrier between the enzymes enclosed in the lysosome and the external substrate. The activity of the enzymes contained in lysosomes is limited or nil unless the vesicle in which they are enclosed is ruptured or undergoes MEMBRANE FUSION. (From Rieger et al., Glossary of Genetics: Classical and Molecular, 5th ed). Autolysosome,Autolysosomes,Lysosome
D002847 Chromatography, Agarose A method of gel filtration chromatography using agarose, the non-ionic component of agar, for the separation of compounds with molecular weights up to several million. Chromatography, Sepharose,Agarose Chromatography,Sepharose Chromatography,Agarose Chromatographies,Chromatographies, Agarose,Chromatographies, Sepharose,Sepharose Chromatographies
D002850 Chromatography, Gel Chromatography on non-ionic gels without regard to the mechanism of solute discrimination. Chromatography, Exclusion,Chromatography, Gel Permeation,Chromatography, Molecular Sieve,Gel Filtration,Gel Filtration Chromatography,Chromatography, Size Exclusion,Exclusion Chromatography,Gel Chromatography,Gel Permeation Chromatography,Molecular Sieve Chromatography,Chromatography, Gel Filtration,Exclusion Chromatography, Size,Filtration Chromatography, Gel,Filtration, Gel,Sieve Chromatography, Molecular,Size Exclusion Chromatography
D005347 Fibroblasts Connective tissue cells which secrete an extracellular matrix rich in collagen and other macromolecules. Fibroblast
D005453 Fluorescence The property of emitting radiation while being irradiated. The radiation emitted is usually of longer wavelength than that incident or absorbed, e.g., a substance can be irradiated with invisible radiation and emit visible light. X-ray fluorescence is used in diagnosis.
D005776 Gaucher Disease An autosomal recessive disorder caused by a deficiency of acid beta-glucosidase (GLUCOSYLCERAMIDASE) leading to intralysosomal accumulation of glycosylceramide mainly in cells of the MONONUCLEAR PHAGOCYTE SYSTEM. The characteristic Gaucher cells, glycosphingolipid-filled HISTIOCYTES, displace normal cells in BONE MARROW and visceral organs causing skeletal deterioration, hepatosplenomegaly, and organ dysfunction. There are several subtypes based on the presence and severity of neurological involvement. Cerebroside Lipidosis Syndrome,Gaucher Disease Type 1,Gaucher Disease Type 2,Glucocerebrosidase Deficiency Disease,Glucosylceramide Beta-Glucosidase Deficiency Disease,Neuronopathic Gaucher Disease,Acid beta-Glucosidase Deficiency,Acid beta-Glucosidase Deficiency Disease,Acute Neuronopathic Gaucher Disease,Chronic Gaucher Disease,GBA Deficiency,Gaucher Disease Type 3,Gaucher Disease, Acute Neuronopathic,Gaucher Disease, Acute Neuronopathic Type,Gaucher Disease, Chronic,Gaucher Disease, Chronic Neuronopathic Type,Gaucher Disease, Infantile,Gaucher Disease, Infantile Cerebral,Gaucher Disease, Juvenile,Gaucher Disease, Juvenile and Adult, Cerebral,Gaucher Disease, Neuronopathic,Gaucher Disease, Non-Neuronopathic Form,Gaucher Disease, Noncerebral Juvenile,Gaucher Disease, Subacute Neuronopathic Form,Gaucher Disease, Subacute Neuronopathic Type,Gaucher Disease, Type 1,Gaucher Disease, Type 2,Gaucher Disease, Type 3,Gaucher Disease, Type I,Gaucher Disease, Type II,Gaucher Disease, Type III,Gaucher Splenomegaly,Gaucher Syndrome,Gaucher's Disease,Gauchers Disease,Glucocerebrosidase Deficiency,Glucocerebrosidosis,Glucosyl Cerebroside Lipidosis,Glucosylceramidase Deficiency,Glucosylceramide Beta-Glucosidase Deficiency,Glucosylceramide Lipidosis,Infantile Gaucher Disease,Kerasin Histiocytosis,Kerasin Lipoidosis,Kerasin thesaurismosis,Lipoid Histiocytosis (Kerasin Type),Non-Neuronopathic Gaucher Disease,Subacute Neuronopathic Gaucher Disease,Type 1 Gaucher Disease,Type 2 Gaucher Disease,Type 3 Gaucher Disease,Cerebroside Lipidoses, Glucosyl,Cerebroside Lipidosis Syndromes,Cerebroside Lipidosis, Glucosyl,Deficiencies, GBA,Deficiencies, Glucocerebrosidase,Deficiency Disease, Glucocerebrosidase,Deficiency Diseases, Glucocerebrosidase,Deficiency, GBA,Deficiency, Glucocerebrosidase,Disease, Chronic Gaucher,Disease, Gaucher,Disease, Gaucher's,Disease, Gauchers,Disease, Glucocerebrosidase Deficiency,Disease, Infantile Gaucher,Disease, Juvenile Gaucher,Disease, Neuronopathic Gaucher,Disease, Non-Neuronopathic Gaucher,Diseases, Gauchers,Diseases, Glucocerebrosidase Deficiency,GBA Deficiencies,Gaucher Disease, Non Neuronopathic Form,Gaucher Disease, Non-Neuronopathic,Gauchers Diseases,Glucocerebrosidase Deficiencies,Glucocerebrosidase Deficiency Diseases,Glucocerebrosidoses,Glucosyl Cerebroside Lipidoses,Glucosylceramide Lipidoses,Histiocytoses, Kerasin,Histiocytoses, Lipoid (Kerasin Type),Histiocytosis, Kerasin,Histiocytosis, Lipoid (Kerasin Type),Juvenile Gaucher Disease,Kerasin Histiocytoses,Kerasin Lipoidoses,Kerasin thesaurismoses,Lipidoses, Glucosyl Cerebroside,Lipidoses, Glucosylceramide,Lipidosis Syndrome, Cerebroside,Lipidosis Syndromes, Cerebroside,Lipidosis, Glucosyl Cerebroside,Lipidosis, Glucosylceramide,Lipoid Histiocytoses (Kerasin Type),Lipoidoses, Kerasin,Lipoidosis, Kerasin,Non Neuronopathic Gaucher Disease,Splenomegaly, Gaucher,Syndrome, Cerebroside Lipidosis,Syndrome, Gaucher,Syndromes, Cerebroside Lipidosis,thesaurismoses, Kerasin,thesaurismosis, Kerasin
D005960 Glucosides A GLYCOSIDE that is derived from GLUCOSE. Glucoside

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