Modelling the peroxisomal carbon leak during lipid mobilization in Arabidopsis.

Abstract:

:Mutation of the ACN1 (acetate non-utilizing 1) locus of Arabidopsis results in altered acetate assimilation into gluconeogenic sugars and anapleurotic amino acids and leads to an overall depression in primary metabolite levels by approx. 50% during seedling development. Levels of acetyl-CoA were higher in acn1 compared with wild-type, which is counterintuitive to the activity of ACN1 as a peroxisomal acetyl-CoA synthetase. We hypothesize that ACN1 recycles free acetate to acetyl-CoA within peroxisomes in order that carbon remains fed into the glyoxylate cycle. When ACN1 is not present, carbon in the form of acetate can leak out of peroxisomes and is reactivated to acetyl-CoA within the cytosol. Kinetic models incorporating estimates of carbon input and pathway dynamics from a variety of literature sources have proven useful in explaining how ACN1 may prevent the carbon leak and even contribute to the control of peroxisomal carbon metabolism.

journal_name

Biochem Soc Trans

authors

Hooks MA,Allen E,Wattis JA

doi

10.1042/BST0381230

subject

Has Abstract

pub_date

2010-10-01 00:00:00

pages

1230-3

issue

5

eissn

0300-5127

issn

1470-8752

pii

BST0381230

journal_volume

38

pub_type

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