Zusammenfassung
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1.
Zur Prüfung von zellfreien Extrakten aus Hydrogenomonas auf Pyruvat-Dehydrogenase und Phosphoketolase wurde ein mit Arylamintransacetylase gekoppelter Enzymtest zusammengestellt.
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2.
Für die Pyruvat-Dehydrogenase wurden nach diesem Test höhere Enzymaktivitäten ermittelt als nach Messungen der NAD-Reduktion und der manometrischen Bestimmung der CO2-Entwicklung und des O2-Verbrauchs.
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3.
Es wurde die Kinetik der Acetyl-CoA-Bildung aus Pyruvat, Lactat und Acetat an C-autotroph und heterotroph gewachsenen Zellen verfolgt. Die Pyruvat-Dehydrogenase war in den auf Succinat gewachsenen Zellen doppelt so aktiv wie in den autotroph oder mit Acetat gezogenen Zellen. Die Acetat-thiokinase war in den Acetat-Zellen am aktivsten.
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4.
Phosphoketolase ließ sich zwar in Leuconostoc mesenteroides und Lactobacillus pentosus nachweisen, nicht aber in Hydrogenomonas, Micrococcus denitrificans, Bacillus megaterium, Azotobacter vinelandii, Aspergillus niger und Haselnüssen.
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5.
Im optischen Test wurden in Hydrogenomonas-Extrakten β-Ketothiolase und β-Hydroxybutyryl-CoA-DH nachgewiesen. Die Beteiligung von Malonyl-CoA an der Synthese kurz- und langkettiger Fettsäuren wurde diskutiert.
Summary
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1.
A photometric test employing arylamine acetyltransferase for examination of pyruvate-dehydrogenase and phosphoketolase in cell-free extracts of Hydrogenomonas was developed.
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2.
By means of this test higher enzyme activities were obtained for pyruvate-dehydrogenase than by measurements of NAD-reduction and manometric determinations of CO2-evolution and O2-uptake.
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3.
The kinetics of acetyl-CoA-formation from pyruvate, lactate, and acetate were observed with C-autotrophically as well as with heterotrophically grown cells. The pyruvate-dehydrogenase was twice as active in cells grown on succinate as in those cells grown under autotrophic conditions or with acetate. The acetyl-CoA synthetase was most active in the acetate-grown cells.
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4.
Phosphoketolase was found to be present in Leuconostoc mesenteroides and Lactobacillus pentosus but not in Hydrogenomonas, Micrococcus denitrificans, Bacillus megaterium, Azotobacter vinelandii, Aspergillus niger and hazel-nuts.
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5.
Using optical tests β-ketothiolase and β-hydroxybutyryl-CoA-DH could be demonstrated in extracts of Hydrogenomonas. The participation of malonyl-CoA in the synthesis of short- and long-chain fatty acids was discussed.
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Auszug aus der gleichlautenden Dissertation der mathematisch-naturwissenschaftlichen Fakultät der Universität Göttingen 1964.
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Schindler, J. Die Synthese von Poly-β-hydroxybuttersäure durch Hydrogenomonas H 16: Die zu β-Hydroxybutyryl-Coenzym A führenden Reaktionsschritte. Archiv. Mikrobiol. 49, 236–255 (1964). https://doi.org/10.1007/BF00409747
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DOI: https://doi.org/10.1007/BF00409747