Camel Esterase: Purification and Biochemical Characterization of  N-methyl-Histidylesterase from Camelus  dromedarius Liver

Camel Esterase: Purification and Biochemical Characterization of N-methyl-Histidylesterase from Camelus dromedarius Liver

von Manal Ahmad
Taschenbuch - 9783659213984
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Beschreibung

The distribution of esterase isozymes in camel was investigated. The order of esterase activity was liverlung kidney third stomach intestine spleen heart plasma red blood cells. Mammalian heart, intestine, kidney, liver, lung, RBC, plasma, spleen, and stomach have 10, 15, 16, 12, 10, 0, 7, 6, and 16 esterase isozymes, respectively. Esterase was isolated from camel liver (LE3) using the following consecutive steps: solubilization with tris/HCl buffer (10 mM, pH 8), precipitation with ammonium sulfate, chromatography on Affi-gel-butyric acid and Affi-gel-oleic acid and preparative polyacrylamide gel electrophoresis. LE3 was purified to 17.8 fold with 14.1% recovery. The Km values were found as: methyl butyrate (8.3 mM), a-naphthyl acetate (3.65 mM), ß-naphthyl myristate (66.7 mM), p-nitrophenyl acetate (0.29 mM), and phenyl acetate (5.26 mM). The Ki of LE3 inhibition by bis(4-nitrophenyl) phosphate was 7.9 µM, and 58 µM by phenyl-methyl-sulfonyl fluoride. The inhibition by these inhibitors is irreversible. LE3 showed a dimeric structure with molecular weight of 129 KDa. The N-terminus was aspartic acid. LE3 has N-methylated histidine.

Details

Verlag LAP Lambert Academic Publishing
Ersterscheinung September 2012
Maße 220 mm x 150 mm x 7 mm
Gewicht 201 Gramm
Format Taschenbuch
ISBN-13 9783659213984
Auflage Nicht bekannt
Seiten 124

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