PMID: 11607173Apr 1, 1991Paper

The role of phosphoenolpyruvate carboxykinase in a marine macroalga with C4-like photosynthetic characteristics

Proceedings of the National Academy of Sciences of the United States of America
J B Reiskind, G Bowes

Abstract

Udotea flabellum is a marine, macroscopic green alga with C4-like photosynthetic characteristics, including little O2 inhibition of photosynthesis, a low CO2 compensation point, and minimal photorespiration; but it lacks anatomical features analogous to the Kranz compartmentation of C4 plants, and phosphoenolpyruvate carboxylase [PEPC; orthophosphate:oxaloacetate carboxy-lyase (phosphorylating), EC 4.1.1.31] activity is negligible. Phosphoenolpyruvate carboxykinase (PEPCK) activity (carboxylating) in Udotea extracts was equivalent to that of ribulose-bisphosphate carboxylase [Rubisco; 3-phospho-D-glycerate carboxy-lyase (dimerizing), EC 4.1.1.39]. When PEPCK activity was inhibited in vivo with 3-mercaptopicolinic acid (MPA), thallus photosynthesis decreased by 70% and became sensitive to O2. Codium decorticatum, a related species that lacks C4-like photosynthetic features and PEPCK activity, showed no increase in O2 inhibition upon exposure to MPA. Rubisco and PEPC activities in Udotea were not inhibited by MPA. Labeling of the early photosynthetic products malate and aspartate was reduced 66% by MPA, while intermediates of the photorespiratory carbon oxidation cycle showed a 3-fold increase. Udotea evolved O2 in the light in t...Continue Reading

Citations

Jun 5, 2010·Photosynthesis Research·John A Raven
Jul 31, 2012·Photosynthesis Research·John A Raven, Catriona L Hurd
Jun 5, 2003·Archives of Biochemistry and Biophysics·Richard C Leegood, Robert P Walker
Feb 16, 2011·Journal of Experimental Botany·Sylvain AubryJulian M Hibberd
May 3, 2005·Annual Review of Plant Biology·Mario GiordanoJohn A Raven
Jan 7, 2014·Photosynthesis Research·John A RavenMario Giordano
Nov 4, 2015·The New Phytologist·Romain ClementBrigitte Gontero
Mar 19, 2013·Global Change Biology·Marguerite KochXing-Hai Zhang
Feb 8, 2013·Annals of Botany·Riyadh Muhaidat, Athena D McKown
Jul 18, 2002·Physiologia Plantarum·María V LaraCarlos S Andreo
Sep 25, 2019·The Biochemical Journal·Bruno E RojasAlberto A Iglesias
Jun 15, 2007·Eukaryotic Cell·James V Moroney, Ruby A Ynalvez
Oct 1, 1992·Oecologia·S C MaberlyA M Johnston
Apr 4, 2017·Journal of Experimental Botany·Romain ClementBrigitte Gontero
Jun 25, 2017·Journal of Experimental Botany·Stephen C Maberly, Brigitte Gontero
Dec 1, 1992·Oecologia·A M JohnstonJ A Raven
Mar 2, 2019·Annual Review of Plant Biology·Crysten E Blaby-Haas, Sabeeha S Merchant
Mar 1, 2007·Functional Plant Biology : FPB·Erika A SudderthRowan F Sage

❮ Previous
Next ❯

Related Feeds

Biosynthetic Transformations

Biosyntheic transformtions are multi-step, enzyme-catalyzed processes where substrates are converted into more complex products in living organisms. Simple compounds are modified, converted into other compounds, or joined together to form macromolecules. Discover the latest research on biosynthetic transformations here.