Download the full-sized PDF of Role of cytosolic acyl-CoA binding protein in seed oil biosynthesisDownload the full-sized PDF



Permanent link (DOI):


Export to: EndNote  |  Zotero  |  Mendeley


This file is in the following communities:

Graduate Studies and Research, Faculty of


This file is in the following collections:

Theses and Dissertations

Role of cytosolic acyl-CoA binding protein in seed oil biosynthesis Open Access


Other title
acyl-CoA binding protein
acyl editing
seed oil modification
Type of item
Degree grantor
University of Alberta
Author or creator
Yurchenko, Olga
Supervisor and department
Weselake, Randall (Agricultural, Food and Nutritional Science)
Examining committee member and department
Weselake, Randall (Agricultural, Food and Nutritional Science)
Scarpella, Enrico (Biological Sciences)
Thompson, John (University of Waterloo)
Ozga, Jocelyn (Agricultural, Food and Nutritional Science)
Dixon, Walter (Agricultural, Food and Nutritional Science)
Department of Agricultural, Food and Nutritional Science

Date accepted
Graduation date
Doctor of Philosophy
Degree level
Acyl-CoA binding protein (ACBP) ubiquitously found in eukaryotic organisms fulfills important functions of solubilisation, protection and transport of acyl-CoA esters, a major intermediate of lipid metabolism. This thesis presents an investigation of the physiological role of the small cytosolic ACBP in seed oil biosynthesis. The second important objective of this study was to evaluate the use of ACBP as a molecular tool for modification of seed oil content and/or fatty acid (FA) composition. Agrobacterium-mediated transformation of Arabidopsis thaliana and Brassica napus was performed with a number of genetic constructs designed for seed-specific expression of the B. napus cDNA encoding a small cytosolic ACBP. Protein level and subcellular localization of BnACBP in A. thaliana transgenic seeds depended on the structure of the genetic constructs – mainly, the presence of additional in-frame sequences, encoding a protein fusion partners or signal peptides. Seed oil from A. thaliana T2 and T3 seeds had increased polyunsaturated fatty acid (PUFA) percentage (18:2cis delta9,12 and, in some lines, 18:3cis delta9,12,15) at the expense of very-long-chain monounsaturated (20:1cis delta11) and saturated (18:0) fatty acids. An increase in PUFA levels in seed oil was due to enhanced acyl channeling from the acyl-CoA pool to phosphatidylcholine, the substrate for extraplastidial FA desaturation. The activity of A. thaliana acyl-CoA: lysophosphatidylcholine acyltransferase (AthLPCAT), an enzyme involved in acyl exchange between acyl-CoA and PC, was significantly increased in the presence of the recombinant B. napus ACBP (rBnACBP) in the reaction mixture. rBnACBP also modulated enzymatic activities of glycerol-3-phosphate acyltransferase and diacylglycerol acyltransferase in vitro. Finally, the effect of constitutive or seed-specific gene silencing of ACBP on seed oil formation was examined. A. thaliana transformation with RNAi constructs resulted in partial suppression of ACBP expression and changes in FA composition of seed oil which included an increase in the percentage of 18:1cis delta9 and 18:2cis delta9,12 and, decrease of 18:3cis delta9,12,15. Overall, the results of this study demonstrate that the small cytosolic ACBP plays an important role in acyl exchange between acyl-CoA and PC metabolic pools. Overexpression of ACBP during seed development can be useful in genetic engineering strategies aimed at modifying the FA composition of seed oils.
License granted by Olga Yurchenko ( on 2009-09-26T07:11:34Z (GMT): Permission is hereby granted to the University of Alberta Libraries to reproduce single copies of this thesis and to lend or sell such copies for private, scholarly or scientific research purposes only. Where the thesis is converted to, or otherwise made available in digital form, the University of Alberta will advise potential users of the thesis of the above terms. The author reserves all other publication and other rights in association with the copyright in the thesis, and except as herein provided, neither the thesis nor any substantial portion thereof may be printed or otherwise reproduced in any material form whatsoever without the author's prior written permission.
Citation for previous publication

File Details

Date Uploaded
Date Modified
Audit Status
Audits have not yet been run on this file.
File format: pdf (Portable Document Format)
Mime type: application/pdf
File size: 23744934
Last modified: 2015:10:12 21:09:53-06:00
Filename: Yurchenko_Olga_Fall 2009.pdf
Original checksum: 53ca284ecadd1a124f6f122ab38d8515
Well formed: true
Valid: true
File title: Microsoft Word - Yurchenko_Olga_Fall 2009
File author: olgay
Page count: 216
Activity of users you follow
User Activity Date