On the trail of iron uptake in ancestral Cyanobacteria on early Earth.

Autor: Enzingmüller-Bleyl TC; Department of Microbiology, University of Kaiserslautern, Kaiserslautern, Germany., Boden JS; School of Geographical Sciences, Faculty of Science, University of Bristol, Bristol, UK.; School of Earth and Environmental Sciences, University of St. Andrews, St. Andrews, UK., Herrmann AJ; Department of Microbiology, University of Kaiserslautern, Kaiserslautern, Germany., Ebel KW; Department of Microbiology, University of Kaiserslautern, Kaiserslautern, Germany., Sánchez-Baracaldo P; School of Geographical Sciences, Faculty of Science, University of Bristol, Bristol, UK., Frankenberg-Dinkel N; Department of Microbiology, University of Kaiserslautern, Kaiserslautern, Germany., Gehringer MM; Department of Microbiology, University of Kaiserslautern, Kaiserslautern, Germany.
Jazyk: angličtina
Zdroj: Geobiology [Geobiology] 2022 Nov; Vol. 20 (6), pp. 776-789. Date of Electronic Publication: 2022 Jul 30.
DOI: 10.1111/gbi.12515
Abstrakt: Cyanobacteria oxygenated Earth's atmosphere ~2.4 billion years ago, during the Great Oxygenation Event (GOE), through oxygenic photosynthesis. Their high iron requirement was presumably met by high levels of Fe(II) in the anoxic Archean environment. We found that many deeply branching Cyanobacteria, including two Gloeobacter and four Pseudanabaena spp., cannot synthesize the Fe(II) specific transporter, FeoB. Phylogenetic and relaxed molecular clock analyses find evidence that FeoB and the Fe(III) transporters, cFTR1 and FutB, were present in Proterozoic, but not earlier Archaean lineages of Cyanobacteria. Furthermore Pseudanabaena sp. PCC7367, an early diverging marine, benthic strain grown under simulated Archean conditions, constitutively expressed cftr1, even after the addition of Fe(II). Our genetic profiling suggests that, prior to the GOE, ancestral Cyanobacteria may have utilized alternative metal iron transporters such as ZIP, NRAMP, or FicI, and possibly also scavenged exogenous siderophore bound Fe(III), as they only acquired the necessary Fe(II) and Fe(III) transporters during the Proterozoic. Given that Cyanobacteria arose 3.3-3.6 billion years ago, it is possible that limitations in iron uptake may have contributed to the delay in their expansion during the Archean, and hence the oxygenation of the early Earth.
(© 2022 The Authors. Geobiology published by John Wiley & Sons Ltd.)
Databáze: MEDLINE
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