title: Purification and properties of beta-galactosidase from chicken seminal plasma.
abstract: 1. beta-Galactosidase (EC 3.2.1.23) from chicken seminal plasma was purified approx. 111-fold to homogeneity. 2. pH optimum of the enzyme ranged from 3.6 to 4.0 and its Km was 0.65 mM with p-nitrophenyl-beta-D-galactoside as substrate. 3. The enzyme was unstable at its optimal activity pH and was activated by Cl- ions. 4. The enzyme had pI value of 4.0. 5. The active enzyme had Mr approx. 100,000 by Sephacryl S-300 chromatography. SDS electrophoresis in the presence of beta-mercaptoethanol showed four bands corresponding to Mr of approx. 90,000, 75,000, 65,000 and 13,000.
mesh_terms: D000818:Animals; D002645:Chickens / Q000378:metabolism*; D002850:Chromatography, Gel; D004591:Electrophoresis, Polyacrylamide Gel; D005696:Galactosidases / Q000302:isolation & purification*; D006863:Hydrogen-Ion Concentration; D007526:Isoelectric Point; D008297:Male; D008970:Molecular Weight; D012661:Semen / Q000201:enzymology*; D001616:beta-Galactosidase / Q000302:isolation & purification* / Q000378:metabolism
chemical_list: D005696:Galactosidases; D001616:beta-Galactosidase