Selective inhibition of CO sub 2 transport in a cyanobacterium

Journal Article · Sat Apr 01 04:00:00 EST 1989 · Plant Physiology, Supplement; (USA)

OSTI ID:6937820

Espie, G ^[1]; Miller, A; Canvin, D ^[2]

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1. Concordia Univ., Montreal, Quebec (Canada)
2. Queen's Univ., Kingston, Ontario (Canada)

As determined by mass spectrometry, the active transport of CO{sub 2} was reversibly inhibited by both hydrogen sulfide (H{sub 2}S) and carbonyl sulfide (COS). Carbonyl sulfide was an alternate substrate for the CO{sub 2} transport system and its uptake was inhibited by CO{sub 2} and H{sub 2}S. Uptake of H{sub 2}S was not detected and it was found that H{sub 2}S, rather than HS{sup {minus}}, inhibited CO{sub 2} transport. At concentrations which substantially inhibited CO{sub 2} transport (150 {mu}M), neither H{sub 2}S nor COS inhibited Na{sup +}-dependent HCO{sub 3}{sup {minus}} transport as judged by measurements of chlorophyll a fluorescence yield and photosynthesis. The inhibition of CO{sub 2} transport resulted in the extracellular (CO{sub 2}) rising far above its equilibrium level. This effect was dependent on the presence of Na{sup +} and ongoing HCO{sub 3}{sup {minus}} transport. Inhibition of CO{sub 2} transport by H{sub 2}S and COS was independent of Na{sup +}. These results are interpreted to indicate that CO{sub 2} and HCO{sub 3}{sup {minus}} are transported into the cell by separate carrier systems.

• OSTI ID: 6937820
• Journal Information: Plant Physiology, Supplement; (USA), Journal Name: Plant Physiology, Supplement; (USA) Vol. 89:4; ISSN PPYSA; ISSN 0079-2241
• Country of Publication: United States
• Language: English

Related Subjects

551000* -- Physiological Systems
560300 -- Chemicals Metabolism & Toxicology
59 BASIC BIOLOGICAL SCIENCES
63 RADIATION, THERMAL, AND OTHER ENVIRON. POLLUTANT EFFECTS ON LIVING ORGS. AND BIOL. MAT.
ACID CARBONATES
ALKALI METAL COMPOUNDS
BIOCHEMICAL REACTION KINETICS
BIOLOGICAL EFFECTS
CARBON COMPOUNDS
CARBON DIOXIDE
CARBON OXIDES
CARBON SULFIDES
CARBOXYLIC ACIDS
CHALCOGENIDES
CHEMICAL REACTIONS
CHLOROPHYLL
CYANOBACTERIA
HETEROCYCLIC ACIDS
HETEROCYCLIC COMPOUNDS
HYDROGEN COMPOUNDS
HYDROGEN SULFIDES
INHIBITION
KINETICS
MICROORGANISMS
ORGANIC ACIDS
ORGANIC COMPOUNDS
ORGANIC NITROGEN COMPOUNDS
OXIDES
OXYGEN COMPOUNDS
PHOTOCHEMICAL REACTIONS
PHOTOSYNTHESIS
PHYSIOLOGY
PHYTOCHROMES
PIGMENTS
PORPHYRINS
PROTEINS
REACTION KINETICS
SODIUM COMPOUNDS
SULFIDES
SULFUR COMPOUNDS
SYNTHESIS
UPTAKE