Identification of an ATP-binding cassette transporter involved in bicarbonate uptake in the cyanobacterium Synechococcus sp. strain PCC7942
dc.contributor.author | Omata, Tatsuo | |
dc.contributor.author | Price, Graeme (Dean) | |
dc.contributor.author | Badger, Murray | |
dc.contributor.author | Okamura, Masato | |
dc.contributor.author | Gohta, Satoshi | |
dc.contributor.author | Ogawa, Teruo | |
dc.date.accessioned | 2015-12-13T23:40:40Z | |
dc.date.issued | 1999 | |
dc.date.updated | 2015-12-12T09:30:01Z | |
dc.description.abstract | Exposure of cells of cyanobacteria (blue-green algae) grown under high- CO2 conditions to inorganic C-limitation induces transcription of particular genes and expression of high-affinity CO2 and HCO3- transport systems. Among the low-CO2-inducible transcription units of Synechococcus sp. strain PCC 7942 is the cmpABCD operon, encoding an ATP-binding cassette transporter similar to the nitrate/nitrite transporter of the same cyanobacterium. A nitrogen-regulated promoter was used to selectively induce expression of the cmpABCD genes by growth of transgenic cells on nitrate under high CO2 conditions. Measurements of the initial rate of HCO3- uptake after onset of light, and of the steady-state rate of HCO3- uptake in the light, showed that the controlled induction of the cmp genes resulted in selective expression of high-affinity HCO3- transport activity. The forced expression of cmpABCD did not significantly increase the CO2 uptake capabilities of the cells. These findings demonstrated that the cmpABCD genes encode a high- affinity HCO3- transporter. A deletion mutant of cmpAB (M42) retained low CO2-inducible activity of HCO3- transport, indicating the occurrence of HCO3- transporter(s) distinct from the one encoded by cmpABCD. HCO3- uptake by low-CO2-induced M42 cells showed lower affinity for external HCO3- than for wild-type cells under the same conditions, showing that the HCO3- transporter encoded by cmpABCD has the highest affinity for HCO3- among the HCO3- transporters present in the cyanobacterium. This appears to be the first unambiguous identification and description of a primary active HCO3- transporter. | |
dc.identifier.issn | 0027-8424 | |
dc.identifier.uri | http://hdl.handle.net/1885/94571 | |
dc.publisher | National Academy of Sciences (USA) | |
dc.source | PNAS - Proceedings of the National Academy of Sciences of the United States of America | |
dc.subject | Keywords: adenosine triphosphate; bicarbonate; article; bacterial growth; carbon dioxide fixation; cyanobacterium; genetic analysis; gram negative bacterium; nonhuman; photosynthesis; priority journal; ATP-Binding Cassette Transporters; Bicarbonates; Cyanobacteria; | |
dc.title | Identification of an ATP-binding cassette transporter involved in bicarbonate uptake in the cyanobacterium Synechococcus sp. strain PCC7942 | |
dc.type | Journal article | |
local.bibliographicCitation.issue | 23 | |
local.bibliographicCitation.lastpage | 13576 | |
local.bibliographicCitation.startpage | 13571 | |
local.contributor.affiliation | Omata, Tatsuo, Nagoya University | |
local.contributor.affiliation | Price, Graeme (Dean), College of Medicine, Biology and Environment, ANU | |
local.contributor.affiliation | Badger, Murray, College of Medicine, Biology and Environment, ANU | |
local.contributor.affiliation | Okamura, Masato, Nagoya University | |
local.contributor.affiliation | Gohta, Satoshi, Nagoya University | |
local.contributor.affiliation | Ogawa, Teruo, Nagoya University | |
local.contributor.authoremail | u8201788@anu.edu.au | |
local.contributor.authoruid | Price, Graeme (Dean), u8201788 | |
local.contributor.authoruid | Badger, Murray, u8002735 | |
local.description.embargo | 2037-12-31 | |
local.description.notes | Imported from ARIES | |
local.description.refereed | Yes | |
local.identifier.absfor | 060501 - Bacteriology | |
local.identifier.ariespublication | MigratedxPub24180 | |
local.identifier.citationvolume | 96 | |
local.identifier.doi | 10.1073/pnas.96.23.13571 | |
local.identifier.scopusID | 2-s2.0-0033539480 | |
local.identifier.uidSubmittedBy | Migrated | |
local.type.status | Published Version |
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