title: N-acetyl-beta-D-hexosaminidase component A. Different forms in human tissues and fluids.
abstract: 1. Hexosaminidase A of human serum was resolved into two components, a minor form with properties identical with those of the single hexosaminidase A component of human liver, and a major form with significantly different properties. 2. The major serum hexosaminidase A form was eluted from a DEAE-cellulose column at a lower salt concentration than that required to elute the liver form. 3. A multiple-pass technique was used to elute the major serum enzyme A from a Sephadex G-150 column before that of liver enzyme A. 4. Clostridium perfringens neuraminidase converted the major component of serum hexosaminidase A into a form that was held less tightly by DEAE-cellulose, but the minor component of the A enzyme of serum, and the A enzyme of liver were not affected. 5. The hexosaminidase A from tears was similar to the A enzyme from serum, whereas those from several human tissues and from urine and lymph were similar to the liver form. 6. The A enzyme from serum may be derived from the A enzyme from liver by glycosylation before secretion.
mesh_terms: D000081:Acetamides; D001826:Body Fluids / Q000201:enzymology*; D002848:Chromatography, DEAE-Cellulose; D002850:Chromatography, Gel; D003016:Clostridium perfringens / Q000201:enzymology; D006596:Hexosaminidases / Q000032:analysis* / Q000097:blood / Q000378:metabolism / Q000652:urine; D006801:Humans; D007527:Isoenzymes / Q000032:analysis; D008099:Liver / Q000201:enzymology; D008196:Lymph / Q000201:enzymology; D009439:Neuraminidase; D013666:Tears / Q000201:enzymology
chemical_list: D000081:Acetamides; D007527:Isoenzymes; D006596:Hexosaminidases; D009439:Neuraminidase