| Algal evolution in relation to atmospheric CO2: carboxylases, carbon-concentrating mechanisms and carbon oxidation cycles. | |
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MedLine Citation:
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PMID: 22232762 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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Oxygenic photosynthesis evolved at least 2.4 Ga; all oxygenic organisms use the ribulose bisphosphate carboxylase-oxygenase (Rubisco)-photosynthetic carbon reduction cycle (PCRC) rather than one of the five other known pathways of autotrophic CO(2) assimilation. The high CO(2) and (initially) O(2)-free conditions permitted the use of a Rubisco with a high maximum specific reaction rate. As CO(2) decreased and O(2) increased, Rubisco oxygenase activity increased and 2-phosphoglycolate was produced, with the evolution of pathways recycling this inhibitory product to sugar phosphates. Changed atmospheric composition also selected for Rubiscos with higher CO(2) affinity and CO(2)/O(2) selectivity correlated with decreased CO(2)-saturated catalytic capacity and/or for CO(2)-concentrating mechanisms (CCMs). These changes increase the energy, nitrogen, phosphorus, iron, zinc and manganese cost of producing and operating Rubisco-PCRC, while biosphere oxygenation decreased the availability of nitrogen, phosphorus and iron. The majority of algae today have CCMs; the timing of their origins is unclear. If CCMs evolved in a low-CO(2) episode followed by one or more lengthy high-CO(2) episodes, CCM retention could involve a combination of environmental factors known to favour CCM retention in extant organisms that also occur in a warmer high-CO(2) ocean. More investigations, including studies of genetic adaptation, are needed. |
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Authors:
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John A Raven; Mario Giordano; John Beardall; Stephen C Maberly |
Publication Detail:
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Type: Journal Article; Research Support, Non-U.S. Gov't; Review |
Journal Detail:
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Title: Philosophical transactions of the Royal Society of London. Series B, Biological sciences Volume: 367 ISSN: 1471-2970 ISO Abbreviation: Philos. Trans. R. Soc. Lond., B, Biol. Sci. Publication Date: 2012 Feb |
Date Detail:
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Created Date: 2012-01-10 Completed Date: 2012-04-26 Revised Date: 2013-04-12 |
Medline Journal Info:
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Nlm Unique ID: 7503623 Medline TA: Philos Trans R Soc Lond B Biol Sci Country: England |
Other Details:
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Languages: eng Pagination: 493-507 Citation Subset: IM |
Affiliation:
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Division of Plant Sciences, The James Hutton Institute, University of Dundee at TJHI, Invergowrie, Dundee DD2 5DA, UK. j.a.raven@dundee.ac.uk |
Export Citation:
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| MeSH Terms | |
Descriptor/Qualifier:
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Atmosphere
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chemistry* Autotrophic Processes Biological Evolution* Carbon / chemistry* Carbon Cycle Carbon Dioxide / chemistry* Cyanobacteria / chemistry, enzymology* Diffusion Enzyme Activation Glycolates / chemistry Nitrogen / chemistry Oxidation-Reduction Oxygenases / chemistry Photosynthesis Ribulose-Bisphosphate Carboxylase / chemistry* |
| Grant Support | |
ID/Acronym/Agency:
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//Biotechnology and Biological Sciences Research Council |
| Chemical | |
Reg. No./Substance:
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0/Glycolates; 124-38-9/Carbon Dioxide; 13147-57-4/phosphoglycolate; 7440-44-0/Carbon; 7727-37-9/Nitrogen; EC 1.13.-/Oxygenases; EC 4.1.1.39/Ribulose-Bisphosphate Carboxylase |
| Comments/Corrections | |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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