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Advances in Cyanobacterial Carbon Fixations and Assimilations
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Advances in Cyanobacterial Carbon Fixations and Assimilations

A special issue of Plants (ISSN 2223-7747). This special issue belongs to the section "Plant Structural Biology".

Deadline for manuscript submissions: closed (30 December 2023) | Viewed by 3151

Special Issue Editors

Dr. Yongliang Jiang

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Guest Editor
Hefei National Laboratory for Physical Sciences at the Microscale, School of Life Sciences, University of Science and Technology of China, Hefei 230026, China
Interests: structural biology; molecular biology; biochemistry; cyanobacteria; RuBisCO; carboxysome; carbon fixation
Prof. Dr. Néstor Carrillo

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Guest Editor
Instituto de Biología Molecular y Celular de Rosario (IBR-UNR/CONICET), Facultad de Ciencias Bioquímicas y Farmacéuticas, Universidad Nacional de Rosario, Rosario S2002LRK, Argentina
Interests: cyanobacteria; microalgae; photosynthesis; chloroplastic redox state; plant biochemistry; plant biology
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

As ancient photoautotrophic bacteria, cyanobacteria can perform photosynthesis, which converts inorganic carbon into sugars. During long-term evolution, cyanobacteria have evolved an efficient carbon fixation pathway that accumulates CO2 into carbon fixation machinery, termed carboxysome, for a higher efficiency of carbon fixation and assimilation.

During recent decades, extensive studies have yielded progress on the structure and molecular mechanism of carbon fixation pathways in cyanobacteria. As more carbon fixation pathways and molecular machineries are discovered, the potential for the applications of CO2-concentrating mechanisms in plants and crops are tested, providing the basis for guiding the design and engineering of crops with an enhanced carbon fixation pathway.

This Special Issue mainly focuses on the structural basis and molecular mechanism of carbon fixation and assimilation pathways in cyanobacteria. Studies on carbon fixation pathways, the coordination of carbon and nitrogen metabolisms, and the engineering of RuBisCO and proteins involved in cyanobacterial carbon fixation are welcomed. The review articles and comments on recent advances in the carbon and nitrogen metabolisms in cyanobacteria are also encouraged.

Dr. Yongliang Jiang
Prof. Dr. Néstor Carrillo
Guest Editors

Manuscript Submission Information

Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All submissions that pass pre-check are peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as short communications are invited. For planned papers, a title and short abstract (about 100 words) can be sent to the Editorial Office for announcement on this website.

Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Plants is an international peer-reviewed open access semimonthly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 2700 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

Keywords

  • carbon and nitrogen metabolism in cyanobacteria
  • CO2-concentrating mechanism
  • carbon fixation
  • plant and cyanobacterial structural biology

Published Papers (2 papers)

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Research

16 pages, 6018 KiB  
Article
Genomic Analysis of Leptolyngbya boryana CZ1 Reveals Efficient Carbon Fixation Modules
by Xiaohui Bai, Honghui Wang, Wenbin Cheng, Junjun Wang, Mengyang Ma, Haihang Hu, Zilong Song, Hongguang Ma, Yan Fan, Chenyu Du and Jingcheng Xu
Plants 2023, 12(18), 3251; https://doi.org/10.3390/plants12183251 - 13 Sep 2023
Viewed by 1126
Abstract
Cyanobacteria, one of the most widespread photoautotrophic microorganisms on Earth, have evolved an inorganic CO2-concentrating mechanism (CCM) to adapt to a variety of habitats, especially in CO2-limited environments. Leptolyngbya boryana, a filamentous cyanobacterium, is widespread in a variety [...] Read more.
Cyanobacteria, one of the most widespread photoautotrophic microorganisms on Earth, have evolved an inorganic CO2-concentrating mechanism (CCM) to adapt to a variety of habitats, especially in CO2-limited environments. Leptolyngbya boryana, a filamentous cyanobacterium, is widespread in a variety of environments and is well adapted to low-inorganic-carbon environments. However, little is currently known about the CCM of L. boryana, in particular its efficient carbon fixation module. In this study, we isolated and purified the cyanobacterium CZ1 from the Xin’anjiang River basin and identified it as L. boryana by 16S rRNA sequencing. Genome analysis revealed that L. boryana CZ1 contains β-carboxysome shell proteins and form 1B of Rubisco, which is classify it as belonging to the β-cyanobacteria. Further analysis revealed that L. boryana CZ1 employs a fine CCM involving two CO2 uptake systems NDH-13 and NDH-14, three HCO3− transporters (SbtA, BicA, and BCT1), and two carboxysomal carbonic anhydrases. Notably, we found that NDH-13 and NDH-14 are located close to each other in the L. boryana CZ1 genome and are back-to-back with the ccm operon, which is a novel gene arrangement. In addition, L. boryana CZ1 encodes two high-affinity Na+/HCO3− symporters (SbtA1 and SbtA2), three low-affinity Na+-dependent HCO3− transporters (BicA1, BicA2, and BicA3), and a BCT1; it is rare for a single strain to encode all three bicarbonate transporters in such large numbers. Interestingly, L. boryana CZ1 also uniquely encodes two active carbonic anhydrases, CcaA1 and CcaA2, which are also rare. Taken together, all these results indicated that L. boryana CZ1 is more efficient at CO2 fixation. Moreover, compared with the reported CCM gene arrangement of cyanobacteria, the CCM-related gene distribution pattern of L. boryana CZ1 was completely different, indicating a novel gene organization structure. These results can enrich our understanding of the CCM-related gene arrangement of cyanobacteria, and provide data support for the subsequent improvement and increase in biomass through cyanobacterial photosynthesis. Full article
(This article belongs to the Special Issue Advances in Cyanobacterial Carbon Fixations and Assimilations)
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17 pages, 4227 KiB  
Article
Extracellular CahB1 from Sodalinema gerasimenkoae IPPAS B-353 Acts as a Functional Carboxysomal β-Carbonic Anhydrase in Synechocystis sp. PCC6803
by Jun Minagawa and Marcel Dann
Plants 2023, 12(2), 265; https://doi.org/10.3390/plants12020265 - 6 Jan 2023
Cited by 1 | Viewed by 1684
Abstract
Cyanobacteria mostly rely on the active uptake of hydrated CO2 (i.e., bicarbonate ions) from the surrounding media to fuel their inorganic carbon assimilation. The dehydration of bicarbonate in close vicinity of RuBisCO is achieved through the activity of carboxysomal carbonic anhydrase (CA) [...] Read more.
Cyanobacteria mostly rely on the active uptake of hydrated CO2 (i.e., bicarbonate ions) from the surrounding media to fuel their inorganic carbon assimilation. The dehydration of bicarbonate in close vicinity of RuBisCO is achieved through the activity of carboxysomal carbonic anhydrase (CA) enzymes. Simultaneously, many cyanobacterial genomes encode extracellular α- and β-class CAs (EcaA, EcaB) whose exact physiological role remains largely unknown. To date, the CahB1 enzyme of Sodalinema gerasimenkoae (formerly Microcoleus/Coleofasciculus chthonoplastes) remains the sole described active extracellular β-CA in cyanobacteria, but its molecular features strongly suggest it to be a carboxysomal rather than a secreted protein. Upon expression of CahB1 in Synechocystis sp. PCC6803, we found that its expression complemented the loss of endogenous CcaA. Moreover, CahB1 was found to localize to a carboxysome-harboring and CA-active cell fraction. Our data suggest that CahB1 retains all crucial properties of a cellular carboxysomal CA and that the secretion mechanism and/or the machinations of the Sodalinema gerasimenkoae carboxysome are different from those of Synechocystis. Full article
(This article belongs to the Special Issue Advances in Cyanobacterial Carbon Fixations and Assimilations)
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