STUDIES ON THE METABOLISM OF A SULFUR-OXIDIZING BACTERIUM II. THE SYSTEM OF CO2-FIXATION IN THIOBAC1LLUS THIOOXIDANS |
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Authors: | IWATSUKA HISASHI; KUNO MITSUZO; MARUYAMA MAKIKO |
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Institution: | Biological Institute, Faculty of Science, Nagoya University |
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Abstract: | - In the early stage of CO2-fixation by Thiobacillus thiooxidans,which was incubated aerobically in the presence of sulfur, mostpart of the fixed carbon was found in the phosphate ester fraction.
- The fixation was inhibited by NaF, picolinic acid, PCMB, azide,dipyridyl, o-phenanthroline, monoiodoacetic acid, and arsenite,each in the concentration range where the sulfur oxidation wasnot affected strongly.
- The crude extract of this organismcould fix CO2 in the presenceof ATP, R-5-P and Mg++. Most partof the fixed carbon was foundin PGA.
- The crude extract showedthe CO2-fixation coupled with the H2S-oxidationin the presenceof ADP.
- An appreciable reduction of PGA could not be detectedin thepresence of reducing systems, involving TPNH and DPNH.
(Received March 6, 1962; ) |
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