Inhibition of glucose metabolism by n-hexadecane in Cladosporium (Amorphotheca) resinae.
When Cladosporium resinae is provided with n-hexadecane and glucose, n-hexadecane is used preferentially. Studies using [14C]glucose indicated that n-hexadecane did not inhibit glucose uptake but did retard oxidation of glucose to CO2 and assimilation of glucose carbon into trichloroacetic acid-insoluble material. Glucose could be recovered quantitatively from hydrocarbon-grown cells that had been transferred to glucose. Four enzymes that may be involved in glucose metabolism, hexokinase, glucose-6-phosphate dehydrogenase, glucose-phosphate isomerase, and succinate dehydrogenase, were not detected in cells grown on hexadecane but were present in cells grown on glucose. Addition of hexadecane to extracts of glucose-grown cells resulted in immediate loss of activity for each of the four enzymes, but two other enzymes did not directly involved in glucose metabolism, adenosine triphosphatase and alanine-ketoacid aminotransferase, were not inhibited by hexadecane in vitro. Cells grown on hexadecane and transferred to glucose metabolize intracellular hexadecane; after 1 day, activity of hexokinase, glucose-6-phosphate dehydrogenase, glucosephosphate isomerase, and succinate dehydrogenase could be detected and 22% of the intracellular hydrocarbon had been metabolized. Hexadecane-grown cells transferred to glucose plus cycloheximide showed the same level of activity of all the four enzymes as cells transferred to glucose alone. Thus, intracellular n-hexadecane or a metabolite of hexadecane can inthesis of those enzymes is not inhibited.
D000251:Adenosine Triphosphatases / Q000378:metabolism; D000410:Alanine Transaminase / Q000378:metabolism; D001692:Biological Transport / Q000187:drug effects; D002963:Cladosporium / Q000201:enzymology / Q000378:metabolism*; D003513:Cycloheximide / Q000494:pharmacology; D005947:Glucose / Q000378:metabolism*; D005956:Glucose-6-Phosphate Isomerase / Q000378:metabolism; D005954:Glucosephosphate Dehydrogenase / Q000378:metabolism; D006593:Hexokinase / Q000378:metabolism; D006838:Hydrocarbons / Q000378:metabolism / Q000494:pharmacology*; D003904:Mitosporic Fungi / Q000378:metabolism*; D013385:Succinate Dehydrogenase / Q000378:metabolism
D006838:Hydrocarbons; D003513:Cycloheximide; D005954:Glucosephosphate Dehydrogenase; D013385:Succinate Dehydrogenase; D000410:Alanine Transaminase; D006593:Hexokinase; D000251:Adenosine Triphosphatases; D005956:Glucose-6-Phosphate Isomerase; D005947:Glucose