Regulation and roles of phosphoenolpyruvate carboxykinase in plants

Archives of Biochemistry and Biophysics
Richard C Leegood, Robert P Walker

Abstract

Phosphoenolpyruvate carboxykinase (PCK) is probably ubiquitous in flowering plants, but is confined to certain cells or tissues. It is regulated by phosphorylation, which renders it less active by altering both its substrate affinities and its sensitivity to regulation by adenylates. In the leaves of some C4 plants, such as Panicum maximum, dephosphorylation increases its activity in the light. In other tissues such regulation probably avoids futile cycling between phosphoenolpyruvate and oxaloacetate. Although PCK generally acts as a decarboxylase in plants, its affinity for CO2 measured at physiological concentrations of metal ions is high and would allow it to be freely reversible in vivo. While its function in gluconeogenesis in seeds postgermination and in leaves of C4 and crassulacean acid metabolism plants is clearly established, the possible functions of PCK in other plant cells are discussed, drawing parallels with those in animals, including its integrated function in cataplerosis, nitrogen metabolism, pH regulation, and gluconeogenesis.

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Citations

Mar 29, 2014·Plant Physiology·Christopher R JohnJulian M Hibberd
Feb 10, 2012·Journal of Plant Physiology·Franco FamianiRobert P Walker
Jul 12, 2011·Plant Physiology and Biochemistry : PPB·Robert P WalkerFranco Famiani
Oct 4, 2015·Plant Physiology and Biochemistry : PPB·Robert P WalkerFranco Famiani
Apr 23, 2015·Plant Science : an International Journal of Experimental Plant Biology·Nuria K KoteyevaGerald E Edwards
Oct 21, 2016·Plant Physiology and Biochemistry : PPB·Robert P WalkerFranco Famiani
Feb 11, 2011·Journal of Experimental Botany·Mariangela N FotelliEmmanouil Flemetakis
Feb 15, 2013·Journal of Experimental Botany·A EtienneC Bugaud
Oct 19, 2017·Journal of Experimental Botany·Balasaheb V SonawaneOula Ghannoum
Apr 17, 2018·Journal of Experimental Botany·Balasaheb V SonawaneOula Ghannoum
Mar 16, 2005·Journal of Experimental Botany·Tansy Y P ChiaStephen Rawsthorne
Sep 25, 2019·The Biochemical Journal·Bruno E RojasAlberto A Iglesias
Mar 7, 2020·Annual Review of Plant Biology·Urte Schlüter, Andreas P M Weber
Oct 6, 2019·Scientific Reports·Daniela PontiggiaBenedetta Mattei
Nov 8, 2008·Molecular Biology and Evolution·Pascal-Antoine ChristinGuillaume Besnard

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