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Kang W, Mu L, Hu X. Marine Colloids Boost Nitrogen Fixation in Trichodesmium erythraeum by Photoelectrophy. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2024; 58:9236-9249. [PMID: 38748855 DOI: 10.1021/acs.est.4c01849] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/29/2024]
Abstract
Nitrogen fixation by the diazotrophic cyanobacterium Trichodesmium contributes up to 50% of the bioavailable nitrogen in the ocean. N2 fixation by Trichodesmium is limited by the availability of nutrients, such as iron (Fe) and phosphorus (P). Although colloids are ubiquitous in the ocean, the effects of Fe limitation on nitrogen fixation by marine colloids (MC) and the related mechanisms are largely unexplored. In this study, we found that MC exhibit photoelectrochemical properties that boost nitrogen fixation by photoelectrophy in Trichodesmium erythraeum. MC efficiently promote photosynthesis in T. erythraeum, thus enhancing its growth. Photoexcited electrons from MC are directly transferred to the photosynthetic electron transport chain and contribute to nitrogen fixation and ammonia assimilation. Transcriptomic analysis revealed that MC significantly upregulates genes related to the electron transport chain, photosystem, and photosynthesis, which is consistent with elevated photosynthetic capacities (e.g., Fv/Fm and carboxysomes). As a result, MC increase the N2 fixation rate by 67.5-89.3%. Our findings highlight a proof-of-concept electron transfer pathway by which MC boost nitrogen fixation, broadening our knowledge on the role of ubiquitous colloids in marine nitrogen biogeochemistry.
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Affiliation(s)
- Weilu Kang
- Key Laboratory of Pollution Processes and Environmental Criteria (Ministry of Education), Carbon Neutrality Interdisciplinary Science Centre, College of Environmental Science and Engineering, Nankai University, Tianjin 300350, China
| | - Li Mu
- Tianjin Key Laboratory of Agro-Environment and Product Safety, Key Laboratory for Environmental Factors Controlling Agro-Product Quality Safety (Ministry of Agriculture and Rural Affairs), Institute of Agro-Environmental Protection, Ministry of Agriculture and Rural Affairs, Tianjin 300191, China
| | - Xiangang Hu
- Key Laboratory of Pollution Processes and Environmental Criteria (Ministry of Education), Carbon Neutrality Interdisciplinary Science Centre, College of Environmental Science and Engineering, Nankai University, Tianjin 300350, China
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Masuda T, Bernát G, Bečková M, Kotabová E, Lawrenz E, Lukeš M, Komenda J, Prášil O. Diel regulation of photosynthetic activity in the oceanic unicellular diazotrophic cyanobacterium Crocosphaera watsonii WH8501. Environ Microbiol 2018; 20:546-560. [PMID: 29076633 DOI: 10.1111/1462-2920.13963] [Citation(s) in RCA: 20] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/22/2017] [Revised: 09/29/2017] [Accepted: 10/04/2017] [Indexed: 01/13/2023]
Abstract
The oceanic unicellular diazotrophic cyanobacterium Crocosphaera watsonii WH8501 exhibits large diel changes in abundance of both Photosystem II (PSII) and Photosystem I (PSI). To understand the mechanisms underlying these dynamics, we assessed photosynthetic parameters, photosystem abundance and composition, and chlorophyll-protein biosynthesis over a diel cycle. Our data show that the decline in PSII activity and abundance observed during the dark period was related to a light-induced modification of PSII, which, in combination with the suppressed synthesis of membrane proteins, resulted in monomerization and gradual disassembly of a large portion of PSII core complexes. In the remaining population of assembled PSII monomeric complexes, we detected the non-functional version of the D1 protein, rD1, which was absent in PSII during the light phase. During the dark period, we also observed a significant decoupling of phycobilisomes from PSII and a decline in the chlorophyll a quota, which matched the complete loss of functional PSIIs and a substantial decrease in PSI abundance. However, the remaining PSI complexes maintained their photochemical activity. Thus, during the nocturnal period of nitrogen fixation C. watsonii operates a suite of regulatory mechanisms for efficient utilization/recycling of cellular resources and protection of the nitrogenase enzyme.
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Affiliation(s)
- Takako Masuda
- Centre Algatech, Opatovický mlýn, Institute of Microbiology, The Czech Academy of Sciences, Třeboň, 379 01 Czech Republic
| | - Gábor Bernát
- Centre Algatech, Opatovický mlýn, Institute of Microbiology, The Czech Academy of Sciences, Třeboň, 379 01 Czech Republic
| | - Martina Bečková
- Centre Algatech, Opatovický mlýn, Institute of Microbiology, The Czech Academy of Sciences, Třeboň, 379 01 Czech Republic
| | - Eva Kotabová
- Centre Algatech, Opatovický mlýn, Institute of Microbiology, The Czech Academy of Sciences, Třeboň, 379 01 Czech Republic
| | - Evelyn Lawrenz
- Centre Algatech, Opatovický mlýn, Institute of Microbiology, The Czech Academy of Sciences, Třeboň, 379 01 Czech Republic
| | - Martin Lukeš
- Centre Algatech, Opatovický mlýn, Institute of Microbiology, The Czech Academy of Sciences, Třeboň, 379 01 Czech Republic
| | - Josef Komenda
- Centre Algatech, Opatovický mlýn, Institute of Microbiology, The Czech Academy of Sciences, Třeboň, 379 01 Czech Republic
| | - Ondřej Prášil
- Centre Algatech, Opatovický mlýn, Institute of Microbiology, The Czech Academy of Sciences, Třeboň, 379 01 Czech Republic
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González A, Sevilla E, Bes MT, Peleato ML, Fillat MF. Pivotal Role of Iron in the Regulation of Cyanobacterial Electron Transport. Adv Microb Physiol 2016; 68:169-217. [PMID: 27134024 DOI: 10.1016/bs.ampbs.2016.02.005] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Iron-containing metalloproteins are the main cornerstones for efficient electron transport in biological systems. The abundance and diversity of iron-dependent proteins in cyanobacteria makes those organisms highly dependent of this micronutrient. To cope with iron imbalance, cyanobacteria have developed a survey of adaptation strategies that are strongly related to the regulation of photosynthesis, nitrogen metabolism and other central electron transfer pathways. Furthermore, either in its ferrous form or as a component of the haem group, iron plays a crucial role as regulatory signalling molecule that directly or indirectly modulates the composition and efficiency of cyanobacterial redox reactions. We present here the major mechanism used by cyanobacteria to couple iron homeostasis to the regulation of electron transport, making special emphasis in processes specific in those organisms.
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Affiliation(s)
| | - E Sevilla
- University of Zaragoza, Zaragoza, Spain
| | - M T Bes
- University of Zaragoza, Zaragoza, Spain
| | | | - M F Fillat
- University of Zaragoza, Zaragoza, Spain.
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Panda B, Basu B, Rajaram H, Apte SK. Comparative proteomics of oxidative stress response in three cyanobacterial strains native to Indian paddy fields. J Proteomics 2015; 127:152-60. [PMID: 26013413 DOI: 10.1016/j.jprot.2015.05.020] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/10/2015] [Revised: 05/05/2015] [Accepted: 05/20/2015] [Indexed: 11/26/2022]
Abstract
Three strains of photoautotrophic, heterocystous, nitrogen-fixing cyanobacterium Anabaena, native to Indian paddy fields, were examined for their tolerance and proteomic response to the frequently used weedicide paraquat (methyl viologen). Anabaena 7120 (LD50 dose: 2μM for 6h) and Anabaena L-31 (LD50 dose: 2μM for 5h) showed distinctly better tolerance than Anabaena doliolum (LD50 dose: 2μM for 3h), to methyl viologen induced oxidative stress. The proteomic response, at respective LD50 dose, was mapped by 2D gel protein electrophoresis followed by protein identification by MALDI-ToF mass spectrometry. About 92 and 41 oxidative stress-responsive proteins were identified from Anabaena L-31 and A. doliolum, respectively, and compared with methyl viologen responsive proteins reported from Anabaena 7120 earlier. Upregulation of proteins involved in oxidative stress alleviation and protein homeostasis and downregulation of photosynthesis and carbon metabolism related enzymes appeared to underlie the oxidative stress response in all three Anabaena strains. Reduced photosynthesis and cellular reserves of molecular energy [ATP+NAD(P)H] seemed to overwhelm the cellular machinery to combat oxidative stress and protein denaturation, in preference to other adaptations, while the strain specific differences observed in proteome response appeared to determine the methyl viologen tolerance of individual cyanobacterial strains. This article is part of a Special Issue entitled: Proteomics in India.
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Affiliation(s)
- Bandita Panda
- Molecular Biology Division, Bhabha Atomic Research Centre, Trombay, Mumbai 400085, India
| | - Bhakti Basu
- Molecular Biology Division, Bhabha Atomic Research Centre, Trombay, Mumbai 400085, India
| | - Hema Rajaram
- Molecular Biology Division, Bhabha Atomic Research Centre, Trombay, Mumbai 400085, India
| | - Shree Kumar Apte
- Molecular Biology Division, Bhabha Atomic Research Centre, Trombay, Mumbai 400085, India.
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Panda B, Basu B, Rajaram H, Kumar Apte S. Methyl viologen responsive proteome dynamics ofAnabaenasp. strain PCC7120. Proteomics 2014; 14:1895-904. [DOI: 10.1002/pmic.201300522] [Citation(s) in RCA: 34] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/22/2013] [Revised: 05/16/2014] [Accepted: 06/11/2014] [Indexed: 11/09/2022]
Affiliation(s)
- Bandita Panda
- Molecular Biology Division; Bhabha Atomic Research Centre; Mumbai India
| | - Bhakti Basu
- Molecular Biology Division; Bhabha Atomic Research Centre; Mumbai India
| | - Hema Rajaram
- Molecular Biology Division; Bhabha Atomic Research Centre; Mumbai India
| | - Shree Kumar Apte
- Molecular Biology Division; Bhabha Atomic Research Centre; Mumbai India
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Inactivation of the conserved open reading frame ycf34 of Synechocystis sp. PCC 6803 interferes with the photosynthetic electron transport chain. BIOCHIMICA ET BIOPHYSICA ACTA-BIOENERGETICS 2012; 1817:2016-26. [DOI: 10.1016/j.bbabio.2012.06.002] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/08/2012] [Revised: 05/30/2012] [Accepted: 06/01/2012] [Indexed: 11/17/2022]
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