Purification and properties of arylsulphatase A from rabbit testis.
Rabbit testis arylsulphatase A was purified 140-fold with a recovery of 20% from detergent extracts of an acetone-dried powder by using DE-52 cellulose column chromatography, gel filtration on Sephadex G-200 and preparative isoelectric focusing. The purified enzyme showed one major band with one minor contaminant on electrophoresis in a 7.5% (w/v) polyacrylamide gel at pH8.3. On sodiumdodecyl sulphate/polyacrylamidegel electrophoresis, a single major band was observed with minor contaminants. The final preparation of enzyme was free from general proteolytic, esterase, hyaluronidase, beta-glucuronidase and beta-galactosidase activities. Rabbit testicular arylsulphatase A exists as a dimer of mol.wt. 110000 at pH7.1. At pH5.0 the enzyme is a tetramer of mol.wt. 220000. Arylsulphatase A appears to consist of two identical subunits of mol.wt. 55000 each. The highly purified enzyme has pI4.6. The enzyme hydrolyses p-nitrocatechol sulphate with Km and Vmax, of 4.1 mM and 80nmol/min respectively, but has no activity toward p-nitrophenyl sulphate. The pH optimum of the enzyme varies with the incubation time. By applying Sephacex G-200 chromatography and preparative isoelectric focusing, one form of enzyme was obtained. The enzyme has properites common to arylsulphatase A of other sources with respect to the anomalous time-activity relationship, pI, inhibition by PO42-, SO32- and Ag+ ions and substrate affinity to p-nitrocatechol sulphate. However, the enzyme shows the temperature optimum of arylsulphatase B of other species.
D000818:Animals; D002553:Cerebroside-Sulfatase / Q000037:antagonists & inhibitors / Q000302:isolation & purification*; D002848:Chromatography, DEAE-Cellulose; D002850:Chromatography, Gel; D004591:Electrophoresis, Polyacrylamide Gel; D006863:Hydrogen-Ion Concentration; D007700:Kinetics; D008297:Male; D008722:Methods; D008970:Molecular Weight; D010710:Phosphates / Q000494:pharmacology; D011817:Rabbits; D013429:Sulfatases / Q000302:isolation & purification*; D013431:Sulfates / Q000494:pharmacology; D013696:Temperature; D013737:Testis / Q000201:enzymology*; D013997:Time Factors; D000517:alpha-Chlorohydrin / Q000494:pharmacology
D010710:Phosphates; D013431:Sulfates; D000517:alpha-Chlorohydrin; D013429:Sulfatases; D002553:Cerebroside-Sulfatase