Arabidopsis uses two gluconeogenic gateways for organic acids to fuel seedling establishment.

Abstract:

:Gluconeogenesis is a fundamental metabolic process that allows organisms to make sugars from non-carbohydrate stores such as lipids and protein. In eukaryotes only one gluconeogenic route has been described from organic acid intermediates and this relies on the enzyme phosphoenolpyruvate carboxykinase (PCK). Here we show that two routes exist in Arabidopsis, and that the second uses pyruvate, orthophosphate dikinase (PPDK). Gluconeogenesis is critical to fuel the transition from seed to seedling. Arabidopsis pck1 and ppdk mutants are compromised in seed-storage reserve mobilization and seedling establishment. Radiolabelling studies show that PCK predominantly allows sugars to be made from dicarboxylic acids, which are products of lipid breakdown. However, PPDK also allows sugars to be made from pyruvate, which is a major product of protein breakdown. We propose that both routes have been evolutionarily conserved in plants because, while PCK expends less energy, PPDK is twice as efficient at recovering carbon from pyruvate.

journal_name

Nat Commun

journal_title

Nature communications

authors

Eastmond PJ,Astley HM,Parsley K,Aubry S,Williams BP,Menard GN,Craddock CP,Nunes-Nesi A,Fernie AR,Hibberd JM

doi

10.1038/ncomms7659

subject

Has Abstract

pub_date

2015-04-10 00:00:00

pages

6659

issn

2041-1723

pii

ncomms7659

journal_volume

6

pub_type

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