Characterization of sheep liver N-acetyltransferase

Acetyl-coenzyme A (AcCoA)-dependent arylamine N-acetyltransferase (NAT:EC was isolated from sheep liver and the specific activity was found as 5.3+/-1.4x10(-3) (mean+/-SE, n=8) nmoles/ min/ mg protein. The effects of p-aminobenzoic acid (PABA) and acetylCoA concentrations, pH, amount of enzyme and reaction period, on the enzyme activity were also studied and the optimum conditions for maximum activity of sheep liver NAT was determined. Sulfamethazine (SMZ) was used as a substrate in order to study the polymorphic pattern of the NAT activities in sheep liver. The inhibition studies also showed that N-ethylmaleimide was a potent inhibitor of sheep liver NAT when PABA was used as the substrate.


Separation of three P450 isozymes from liver microsomes of gilthead seabream treated with D-NF and partial purification of cytochrome P4501A1
Sen, A; Arinc, E (1997-01-01)
Three distinct cytochrome P450 isozymes, P4501A1, P4502B and an unidentified P450 isozyme were separated and isolated from beta-NF-treated gilthead seabream liver microsomes. Cytochrome P4501A1 was partially purified from beta-NF-treated gilthead seabream liver microsomes in the presence of detergents Emulgen 913 and cholate and protease inhibitors using two DEAE-cellulose, Porapak Q and two hydroxylapatite column chromatographies. The overall yield of purified P4501A1 was 1.2% with respect to microsomal to...
Assessment of pollution in the West Black Sea Coast of Turkey using biomarker responses in fish
BOZCAARMUTLU, AZRA; Sapmaz, Canan; Aygun, Zuleyha; Arinc, Emel (Elsevier BV, 2009-05-01)
Aim of this study was to determine the extent of pollution in the West Black Sea Coast of Turkey by measuring CYP1A associated EROD activity, phase II enzyme, glutathione S-transferase and antioxidant enzymes, catalase and glutathione reductase activities and immunochemical detection of CYP1A protein level in the liver of mullet. The fish samples were caught from six locations having a varying degree of pollution in the West Black Sea Region of Turkey in August 2005, 2006 and 2007. Mullets caught from Zongu...
İşcan, Mesude (Elsevier BV, 1993-10-01)
1. Nitrofurantoin reductase which catalyzes the bioactivation of nitrofurantoin was purified to electrophoretic homogenity from sheep liver and lung microsomes, with a yield of 15% and 35%, respectively. The specific activity of both reductases was found to be similar (140 nmol/min/mg protein). 2. The effects of nitrofurantoin and NADPH concentrations, pH, ionic strength, amount of enzyme and reaction period, on the enzyme activity were studied and the optimum conditions for maximum activity of purified fi...
Characterization of proteome alterations in Phanerochaete chrysosporium in response to lead exposure
Yildirim, Volkan; ÖZCAN, Servet; Becher, Doerte; Buettner, Knut; Hecker, Michael; Özcengiz, Gülay (Springer Science and Business Media LLC, 2011-03-09)
Background: Total soluble proteome alterations of white rot fungus Phanerochaete chrysosporium in response to different doses (25, 50 and 100 mu M) of Pb (II) were characterized by 2DE in combination with MALDI-TOF-MS.
OZDEN, MY; Hasırcı, Vasıf Nejat (1991-09-02)
Glucose oxidase was entrapped in small unilamellar vesicles composed of phosphatidylcholine, dicetyl phosphate and cholesterol. Prediction of the enzyme content of liposomes by calculations based on input concentrations of lipid and protein, dimensions of the lipids and the liposomes yielded one protein per vesicle. The entrapment efficiency was experimentally determined to be about 13%. On the other hand the entrapment efficiency for the small chromate ions was found to be significantly lower (0.1%). T...
Citation Formats
N. T. Güray, “Characterization of sheep liver N-acetyltransferase,” BIOCHEMICAL ARCHIVES, pp. 107–111, 1997, Accessed: 00, 2020. [Online]. Available: