title: Purification and some properties of carbonic anhydrase from Elephas trogontherii (Steppe elephant) bone.
abstract: Four isoenzymes of carbonic anhydrase (CA) were purified from Elephas Irogontherii (steppe elephant) bone (approx 0.3-0.5 million years old) from different locations (outer peripheral, cytosolic, inner peripheral and integral) using Sepharose 4B-L-tyrosine sulphanilamide affinity chromatography and their kinetics properties were investigated and compared with known CA isoenzymes. The purification degree of CAs was monitored by SDS-PAGE. Purification fold for outer peripheral, inner peripheral, cytosolic and integral CA was 395.6, 652.8, 1091 and 429.3 and the molecular mass (as determined by gel filtration chromatography) was 37, 36, 35, and 39 kDa, respectively. The optimal temperature for isozymes was 10-20, 30, 30 and 60 degrees C and optimal pH- was between 7.5-11, 7.5-10, 7.5-10 and 7.5 respectively. K(m) values (at optimum pH and 20 degrees C) for p-nitrophenyl acetate as substrate were 4.83, 6.80, 4.525 and 3.86 mM and the Vmax values for the same substrate were 0.00097, 0.0149, 0.00249 and 0.00072 micromol/L*min, respectively. I50 values of isoenzymes for the inhibitors of CA - sulphanilamide, KSCN, acetazolamide and NaN3 were also determined.
authors.affiliation: Department of Chemistry, Faculty of Education Atatürk University, 25240, Erzurum, Turkey. demirn@yahoo.com
authors.forename: Yaşar
authors.initials: Y
authors.lastname: Demir
authors.forename: Hayrunnisa
authors.initials: H
authors.lastname: Nadaroğlu
authors.forename: Nazan
authors.initials: N
authors.lastname: Demir
mesh_terms: D000086:Acetazolamide / Q000494:pharmacology; D000818:Animals; D001842:Bone and Bones / Q000201:enzymology*; D002256:Carbonic Anhydrases / Q000302:isolation & purification / Q000378:metabolism*; D004606:Elephants; D006863:Hydrogen-Ion Concentration; D007527:Isoenzymes / Q000037:antagonists & inhibitors / Q000302:isolation & purification / Q000378:metabolism; D019810:Sodium Azide / Q000494:pharmacology; D000077145:Sulfanilamide; D013424:Sulfanilamides / Q000494:pharmacology; D013861:Thiocyanates / Q000494:pharmacology
chemical_list: D007527:Isoenzymes; D013424:Sulfanilamides; D013861:Thiocyanates; D000077145:Sulfanilamide; D019810:Sodium Azide; D002256:Carbonic Anhydrases; D000086:Acetazolamide; C009941:potassium thiocyanate