Diacylglycerol acyltransferase in maturing sunflower seeds

Autor:	S. Triki, P. Mazliak, J. Ben Hamida
Rok vydání:	2000
Předmět:	chemistry.chemical_classification Differential centrifugation Chromatography Kinetics Biology Biochemistry Sunflower Enzyme chemistry Chaps Microsome Specific activity Diacylglycerol kinase
Zdroj:	Biochemical Society Transactions. 28:689-692
ISSN:	1470-8752 0300-5127
DOI:	10.1042/bst0280689
Popis:	Developing sunflower seeds exhibit a high diacylglycerol acyltransferase (DAGAT, EC 2.3.1.20) activity. The distribution of the enzyme has been studied in subcellular fractions prepared by differential centrifugation of seed homogenate. Its activity was characterized using [1-14C]oleoyl-CoA and diolein dispersed in Tween 20. Some properties of the microsomal fraction of DAGAT were investigated. Hyperbolic kinetics were observed, the apparent Km was 60 μM and the specific activity of the reaction 15 pmol/min/mg of protein. Addition of BSA (0.1%) stimulated oleate incorporation, which was not dependent on the presence of exogenous diacylglycerol. Detergents which might solubilize DAGAT, Triton X-100 and CHAPS, were tested for enzyme inhibition, and CHAPS was found to be the least denaturing.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::a830f1adfa9a6319186fa9faf9cbe628 https://doi.org/10.1042/bst0280689 Zobrazit plný text záznamu