Metabolic streamlining in an open-ocean nitrogen-fixing cyanobacterium.
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| Title: | Metabolic streamlining in an open-ocean nitrogen-fixing cyanobacterium. |
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| Authors: | Tripp, H. James, Bench, Shellie R., Turk, Kendra A., Foster, Rachel A., Desany, Brian A., Niazi, Faheem, Affourtit, Jason P., Zehr, Jonathan P. |
| Source: | Nature. 3/4/2010, Vol. 464 Issue 7285, p90-94. 5p. 3 Diagrams, 1 Chart, 1 Graph. |
| Subjects: | Cyanobacteria, Nitrogen, Photosynthetic oxygen evolution, Nucleic acids, Electron transport, Fungus-bacterium relationships, Symbiosis, Genetic regulation, Amino acids |
| Abstract: | Nitrogen (N2)-fixing marine cyanobacteria are an important source of fixed inorganic nitrogen that supports oceanic primary productivity and carbon dioxide removal from the atmosphere. A globally distributed, periodically abundant N2-fixing marine cyanobacterium, UCYN-A, was recently found to lack the oxygen-producing photosystem II complex of the photosynthetic apparatus, indicating a novel metabolism, but remains uncultivated. Here we show, from metabolic reconstructions inferred from the assembly of the complete UCYN-A genome using massively parallel pyrosequencing of paired-end reads, that UCYN-A has a photofermentative metabolism and is dependent on other organisms for essential compounds. We found that UCYN-A lacks a number of major metabolic pathways including the tricarboxylic acid cycle, but retains sufficient electron transport capacity to generate energy and reducing power from light. Unexpectedly, UCYN-A has a reduced genome (1.44 megabases) that is structurally similar to many chloroplasts and some bacteria, in that it contains inverted repeats of ribosomal RNA operons. The lack of biosynthetic pathways for several amino acids and purines suggests that this organism depends on other organisms, either in close association or in symbiosis, for critical nutrients. However, size fractionation experiments using natural populations have so far not provided evidence of a symbiotic association with another microorganism. The UCYN-A cyanobacterium is a paradox in evolution and adaptation to the marine environment, and is an example of the tight metabolic coupling between microorganisms in oligotrophic oceanic microbial communities. [ABSTRACT FROM AUTHOR] |
| Copyright of Nature is the property of Springer Nature and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.) | |
| Database: | Psychology and Behavioral Sciences Collection |
| FullText | Links: – Type: pdflink Text: Availability: 0 |
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| Header | DbId: pbh DbLabel: Psychology and Behavioral Sciences Collection An: 48371163 AccessLevel: 6 PubType: Academic Journal PubTypeId: academicJournal PreciseRelevancyScore: 0 |
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| Items | – Name: Title Label: Title Group: Ti Data: Metabolic streamlining in an open-ocean nitrogen-fixing cyanobacterium. – Name: Author Label: Authors Group: Au Data: <searchLink fieldCode="AR" term="%22Tripp%2C+H%2E+James%22">Tripp, H. James</searchLink><br /><searchLink fieldCode="AR" term="%22Bench%2C+Shellie+R%2E%22">Bench, Shellie R.</searchLink><br /><searchLink fieldCode="AR" term="%22Turk%2C+Kendra+A%2E%22">Turk, Kendra A.</searchLink><br /><searchLink fieldCode="AR" term="%22Foster%2C+Rachel+A%2E%22">Foster, Rachel A.</searchLink><br /><searchLink fieldCode="AR" term="%22Desany%2C+Brian+A%2E%22">Desany, Brian A.</searchLink><br /><searchLink fieldCode="AR" term="%22Niazi%2C+Faheem%22">Niazi, Faheem</searchLink><br /><searchLink fieldCode="AR" term="%22Affourtit%2C+Jason+P%2E%22">Affourtit, Jason P.</searchLink><br /><searchLink fieldCode="AR" term="%22Zehr%2C+Jonathan+P%2E%22">Zehr, Jonathan P.</searchLink> – Name: TitleSource Label: Source Group: Src Data: <searchLink fieldCode="JN" term="%22Nature%22">Nature</searchLink>. 3/4/2010, Vol. 464 Issue 7285, p90-94. 5p. 3 Diagrams, 1 Chart, 1 Graph. – Name: Subject Label: Subjects Group: Su Data: <searchLink fieldCode="DE" term="%22Cyanobacteria%22">Cyanobacteria</searchLink><br /><searchLink fieldCode="DE" term="%22Nitrogen%22">Nitrogen</searchLink><br /><searchLink fieldCode="DE" term="%22Photosynthetic+oxygen+evolution%22">Photosynthetic oxygen evolution</searchLink><br /><searchLink fieldCode="DE" term="%22Nucleic+acids%22">Nucleic acids</searchLink><br /><searchLink fieldCode="DE" term="%22Electron+transport%22">Electron transport</searchLink><br /><searchLink fieldCode="DE" term="%22Fungus-bacterium+relationships%22">Fungus-bacterium relationships</searchLink><br /><searchLink fieldCode="DE" term="%22Symbiosis%22">Symbiosis</searchLink><br /><searchLink fieldCode="DE" term="%22Genetic+regulation%22">Genetic regulation</searchLink><br /><searchLink fieldCode="DE" term="%22Amino+acids%22">Amino acids</searchLink> – Name: Abstract Label: Abstract Group: Ab Data: Nitrogen (N2)-fixing marine cyanobacteria are an important source of fixed inorganic nitrogen that supports oceanic primary productivity and carbon dioxide removal from the atmosphere. A globally distributed, periodically abundant N2-fixing marine cyanobacterium, UCYN-A, was recently found to lack the oxygen-producing photosystem II complex of the photosynthetic apparatus, indicating a novel metabolism, but remains uncultivated. Here we show, from metabolic reconstructions inferred from the assembly of the complete UCYN-A genome using massively parallel pyrosequencing of paired-end reads, that UCYN-A has a photofermentative metabolism and is dependent on other organisms for essential compounds. We found that UCYN-A lacks a number of major metabolic pathways including the tricarboxylic acid cycle, but retains sufficient electron transport capacity to generate energy and reducing power from light. Unexpectedly, UCYN-A has a reduced genome (1.44 megabases) that is structurally similar to many chloroplasts and some bacteria, in that it contains inverted repeats of ribosomal RNA operons. The lack of biosynthetic pathways for several amino acids and purines suggests that this organism depends on other organisms, either in close association or in symbiosis, for critical nutrients. However, size fractionation experiments using natural populations have so far not provided evidence of a symbiotic association with another microorganism. The UCYN-A cyanobacterium is a paradox in evolution and adaptation to the marine environment, and is an example of the tight metabolic coupling between microorganisms in oligotrophic oceanic microbial communities. [ABSTRACT FROM AUTHOR] – Name: AbstractSuppliedCopyright Label: Group: Ab Data: <i>Copyright of Nature is the property of Springer Nature and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.) |
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| RecordInfo | BibRecord: BibEntity: Identifiers: – Type: doi Value: 10.1038/nature08786 Languages: – Code: eng Text: English PhysicalDescription: Pagination: PageCount: 5 StartPage: 90 Subjects: – SubjectFull: Cyanobacteria Type: general – SubjectFull: Nitrogen Type: general – SubjectFull: Photosynthetic oxygen evolution Type: general – SubjectFull: Nucleic acids Type: general – SubjectFull: Electron transport Type: general – SubjectFull: Fungus-bacterium relationships Type: general – SubjectFull: Symbiosis Type: general – SubjectFull: Genetic regulation Type: general – SubjectFull: Amino acids Type: general Titles: – TitleFull: Metabolic streamlining in an open-ocean nitrogen-fixing cyanobacterium. Type: main BibRelationships: HasContributorRelationships: – PersonEntity: Name: NameFull: Tripp, H. James – PersonEntity: Name: NameFull: Bench, Shellie R. – PersonEntity: Name: NameFull: Turk, Kendra A. – PersonEntity: Name: NameFull: Foster, Rachel A. – PersonEntity: Name: NameFull: Desany, Brian A. – PersonEntity: Name: NameFull: Niazi, Faheem – PersonEntity: Name: NameFull: Affourtit, Jason P. – PersonEntity: Name: NameFull: Zehr, Jonathan P. IsPartOfRelationships: – BibEntity: Dates: – D: 04 M: 03 Text: 3/4/2010 Type: published Y: 2010 Identifiers: – Type: issn-print Value: 00280836 Numbering: – Type: volume Value: 464 – Type: issue Value: 7285 Titles: – TitleFull: Nature Type: main |
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