A possible role for carbonic anhydrase in the lumen of chloroplast thylakoids in green algae

Functional Plant Biology : FPB
Eddy van Hunnik, Dieter Sültemeyer

Abstract

In order to understand the function of the lumen carbonic anhydrase (CA) which is bound to PSII at the lumenal side of the thylakoids in chloroplasts of eukaryotic algae, thylakoids were isolated from chloroplasts of Tetraedron minimum, Chlamydomonas noctigama, the cell wall-less mutant Chlamydomonas reinhardtii CW15, and a C. reinhardtii CW15/CIA3 mutant which lacks the lumen CA. The isolated thylakoids produced O2 on illumination and exhibited electron flow between PSII and PSI, indicating that the thylakoids were intact and the photosynthetic apparatus were functional. We could not detect any uptake of HCO3-,nor efflux of CO2, from the thylakoids upon illumination, making it improbable that the CA present in the lumen of the thylakoids would play a role in furnishing CO2 for Rubisco. We were able to determine ATP production upon illumination in isolated thylakoids. Under high inorganic carbon (Ci; 5 mM), all species showed significant amounts of ATP being produced. Under low Ci (200 M), we could not detect ATP formation from C. reinhardtii CW15/CIA3 upon illumination. This mutant was not able to survive more then 4 h of low Ci in culture. We therefore suggest that the lumen CA is not involved in the CO2 concentrating mechani...Continue Reading

Citations

May 3, 2005·Annual Review of Plant Biology·Mario GiordanoJohn A Raven
May 15, 2007·Photosynthesis Research·Karen RobertsJohn A Raven
Jun 15, 2007·Eukaryotic Cell·James V Moroney, Ruby A Ynalvez
Apr 9, 2014·Proceedings of the National Academy of Sciences of the United States of America·Sergey KoroidovJohannes Messinger
Jul 6, 2006·Journal of Biological Inorganic Chemistry : JBIC : a Publication of the Society of Biological Inorganic Chemistry·Klára Nárcisz SasEva Danielsen
Mar 16, 2018·Cellular and Molecular Life Sciences : CMLS·Justine MarchandCornelia Spetea
Oct 26, 2005·Plant Physiology·Juergen ClausenJohannes Messinger

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