Accession Number : AD1014036

Title :   Characterization of Enzymes Involved in Fatty Acid Elongation

Descriptive Note : Technical Report

Corporate Author : Uniformed Services University Of The Health Sciences Bethesda United States

Personal Author(s) : Paul,Shilpi

Full Text :

Report Date : 11 Apr 2007

Pagination or Media Count : 170

Abstract : The very long chain fatty acids, synthesized by a microsomal chain-elongating enzyme system known as the elongase, are essential components of many cellular lipids. Each cycle of elongation involves four successive enzymatic reactions: condensation, reduction, dehydration, and a second reduction, and lengthens the fatty acid by 2 carbon units. Several enzymes that mediate condensation, including the soluble fatty acid synthases and the FAE1-like 3-ketoacyl-CoA synthases (FAE-KCSs) possess a catalytic triad of Cys, His, and His/Asn. In contrast, the Elop proteins, which are implicated in the condensation reaction lack any homology to the well-characterized condensing enzymes. There are three Elop proteins (Elo1p, Elo2p and Elo3p) in yeast and our in vitro assays with microsomes from wild type and the single elo mutants (elo1 delta, elo2 delta and elo3 delta) demonstrate that the Elops are essential for condensation.

Descriptors :   fatty acids , lipids , enzymes , elongation , biosynthesis , electron microscopy , gas chromatography , membranes (biology) , cells (biology) , yeasts

Distribution Statement : APPROVED FOR PUBLIC RELEASE