Carbon fixation in diatoms


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MATSUDA, Yusuke, Peter G. KROTH, 2014. Carbon fixation in diatoms. In: HOHMANN-MARRIOTT, Martin F., ed.. The Structural Basis of Biological Energy Generation. Dordrecht:Springer Netherlands, pp. 335-362. ISBN 978-94-017-8741-3. Available under: doi: 10.1007/978-94-017-8742-0_18

@incollection{Matsuda2014Carbo-28330, title={Carbon fixation in diatoms}, year={2014}, doi={10.1007/978-94-017-8742-0_18}, number={39}, isbn={978-94-017-8741-3}, address={Dordrecht}, publisher={Springer Netherlands}, series={Advances in Photosynthesis and Respiration}, booktitle={The Structural Basis of Biological Energy Generation}, pages={335--362}, editor={Hohmann-Marriott, Martin F.}, author={Matsuda, Yusuke and Kroth, Peter G.} }

Matsuda, Yusuke Kroth, Peter G. 2014 The Structural basis of biological energy generation / Martin F. Hohmann-Marriott (ed.). - Dordrecht ; Heidelberg [u.a.] : Springer, 2014. - S. 335-362. - (Advances in photosynthesis and respiration ; 39). - ISBN 978-94-017-8741-3 eng Kroth, Peter G. 2014-07-09T14:04:55Z Diatoms are unicellular photoautotrophic algae and very successful primary producers in the oceans. Their high primary productivity is probably sustained by their high adaptability and a uniquely arranged metabolism. Diatom belongs to the Chromista, a large eukaryotic group, which has evolved by multiple endosymbiotic steps. As a result, diatoms possess a plastids with four membranes together with complicated translocation systems to transport proteins and metabolites including inorganic substances into and out of the plastids. In addition to the occurrence of potential plasma-membrane transporters, there are numerous carbonic anhydrases (CAs) within the matrix of the layered plastidic membranes, strongly suggesting large interconversion activity between CO<sub>2</sub> and HCO<sub>3 </sub>− within the chloroplast envelope as a part of a CO2-concentrating mechanism (CCM). In diatoms also the Calvin cycle and its adjacent metabolism reveal unique characteristics as, for instance, ribulose-1,5-bisphosphate carboxylase/oxygenase (RubisCO) activase, the plastidic sedoheptulose-1,7-bisphosphatase (SBPase), and the plastidic oxidative pentose phosphate pathway (OPP) are absent. Furthermore, the Calvin cycle metabolism in diatoms is not under the strict redox control by the thioredoxin (Trx) system. Instead, a CO<sub>2</sub>-supplying system in the pyrenoid shows CA activities which are probably regulated by chloroplastic Trxs. Pyrenoidal CAs are also regulated on the transcriptional level by CO<sub>2</sub> concentrations via cAMP as a second messenger, suggesting an intense control system of CO<sub>2</sub> acquisition in response to CO<sub>2</sub> availability. The photorespiratory carbon oxidation cycle (PCOC) is the major pathway to recycle phosphoglycolate in diatoms although this process might not be involved in recycling of 3-phosphoglycerate but instead produces glycine and serine. In this review we focus on recent experimental data together with supportive genome information of CO<sub>2</sub> acquisition and fixation systems primarily in two marine diatoms, Phaeodactylum tricornutum and Thalassiosira pseudonana. 2014-07-09T14:04:55Z Carbon fixation in diatoms terms-of-use Matsuda, Yusuke

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