Purification and characterization of acyl-acyl carrier protein synthetase from oleaginous yeast and its role in triacylglycerol biosynthesis

Gangar, Akanksha and Karande, Anjali A and Rajasekharan, Ram (2001) Purification and characterization of acyl-acyl carrier protein synthetase from oleaginous yeast and its role in triacylglycerol biosynthesis. In: Biochemical Journal, 360 (2). pp. 471-479.

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Abstract

Fatty acids are activated in an ATP-dependent manner before they are utilized. We describe here how the 10S triacylglycerol biosynthetic multienzyme complex from Rhodotorula glutinis is capable of activating non-esterified fatty acids for the synthesis of triacylglycerol. The photolabelling of the complex with $[^3^2P]$azido-ATP showed labelling of a 35kDa polypeptide. The labelled polypeptide was identified as acyl-acyl carrier protein (ACP) synthetase, which catalyses the ATP-dependent ligation of fatty acid with ACP to form acyl-ACP. The enzyme was purified by successive PAGE separations to apparent homogeneity from the soluble fraction of oleaginous yeast and its apparent molecular mass was 35kDa under denaturing and reducing conditions. Acyl-ACP synthetase was specific for ATP. The $K_m$ values for palmitic, stearic, oleic and linoleic acids were found to be 42.9, 30.4, 25.1 and $22.7\mu M$, respectively. The antibodies to acyl-ACP synthetase cross-reacted with Escherichia coli acyl-ACP synthetase. Anti-ACP antibodies showed no cross-reactivity with the purified acyl-ACP synthetase, indicating no bound ACP with the enzyme. Immunoprecipitations with antibodies to acyl-ACP synthetase revealed that this enzyme is a part of the 10 S triacylglycerol biosynthetic complex. These results demonstrate that the soluble acyl-ACP synthetase plays a novel role in activating fatty acids for triacylglycerol biosynthesis in oleaginous yeast.

Item Type:	Journal Article
Publication:	Biochemical Journal
Publisher:	Biochemical Society
Additional Information:	Copyright of this article belongs to Biochemical Society.
Keywords:	acyltransferase;Fatty acid activation;Photolabelling; Rhodotorula glutinis:Triacylglycerol biosynthetic complex
Department/Centre:	Division of Biological Sciences > Biochemistry
Date Deposited:	02 Apr 2007
Last Modified:	04 Jul 2011 10:38
URI:	http://eprints.iisc.ac.in/id/eprint/10596

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