title: Involvement of sulfhydryl groups in the  -galactosidase of Streptococcus lactis.
abstract: Sulfhydryl oxidants and stabilizers caused changes demonstrating the sulfhydryl content of beta-galactosidase for Streptococcus lactis 7962. Ammonium sulfate (0.85 m) rendered the enzyme insensitive to the oxidants. Titrations revealed 11.5 moles of sulfhydryl per mole of enzyme.
mesh_terms: D000645:Ammonium Sulfate; D055598:Chemical Phenomena; D002621:Chemistry; D002729:Chloromercuribenzoates / Q000494:pharmacology*; D002850:Chromatography, Gel; D004492:Edetic Acid / Q000494:pharmacology; D005696:Galactosidases / Q000032:analysis / Q000037:antagonists & inhibitors / Q000378:metabolism*; D013053:Spectrophotometry; D013291:Streptococcus / Q000201:enzymology*; D013439:Sulfhydryl Reagents / Q000494:pharmacology*
chemical_list: D002729:Chloromercuribenzoates; D013439:Sulfhydryl Reagents; D004492:Edetic Acid; D005696:Galactosidases; D000645:Ammonium Sulfate