The definitions used in this glossary of terminology either have been provided by the authors of the articles, or have been extracted wholly or in part, or paraphrased from the following sources: The American Medical Association Encyclopedia of Medicine, Charles B. Clayman, MD, Medical Editor, Random House, New York, 1989; Biotechnology from A to Z, 2d Edition, William Bains, Oxford University Press, New York, New York, 2002; A Dictionary of Genetics, 6th Edition, Robert C. King and William D. Stansfield, Oxford University Press, New York, New York, 2002; Dorland's Illustrated Medical Dictionary, 29th and 30th Editions, W. B. Saunders Company, Philadelphia, 2000, 2003; Genes VII, Benjamin Lewin, Oxford University Press, New York, New York, 2000; The Gale Encyclopedia of Genetic Disorders, Volumes I and II, Stacey L. Blachford, Ed., Thomson Learning, New York, New York, 2002; The Merriam-Webster Dictionary, Merriam-Webster, Inc., Springfield, Massachusetts, 1997; Molecular Biology of the Cell, 3rd Edition, Bruce Alberts, et al., Garland Publishing, 1994; The Random House Dictionary of the English Language, Unabridged Edition, 1966; Webster's Ninth New Collegiate Dictionary, 1991.

DEFINITION:

glycosylceramidase

An enzyme [EC 3.2.1.62] of the hydrolase class that catalyzes the cleavage of ß-linked sugar residue from ß-glycosides with large hydrophobic aglycons, such as galactosyl- and glycosylceramides and phlorizin. Such enzyme activity occurs as part of the ß-glycosidase complex, along with lactase, in the intestinal brush border membrane, where it is frequently referred to as phlorhizin hydrolase . In this context, it is sometimes described as a composite of glucosylceramidase [EC 3.2.1.45] and galactosylceramidase [EC 3.2.1.46] activities and denoted glycosylceramidase [EC 3.2.1.45-6].