期刊
APPLIED AND ENVIRONMENTAL MICROBIOLOGY
卷 66, 期 7, 页码 3004-3009出版社
AMER SOC MICROBIOLOGY
DOI: 10.1128/AEM.66.7.3004-3009.2000
关键词
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Monoterpenes with an unsaturated hydrocarbon structure are mineralized anaerobically by the denitrifying beta-proteobacterium Alcaligenes defragrans. Organic acids occurring in cells of A. defragrans and culture medium were characterized to identify potential products of the monoterpene activation reaction. Geranic acid (E,E-3,7-dimethyl-2,6-octadienoic acid) accumulated to 0.5 mM in cells grown on alpha-phellandrene under nitrate limitation. Cell suspensions of A. defragrans 65Phen synthesized geranic acid in the presence of beta-myrcene, alpha-phellandrene, limonene, or alpha-pinene. Myrcene yielded the highest transformation rates. The alicyclic acid was consumed by cell suspensions during carbon limitation. Heat-labile substances present in cytosolic extracts catalyzed the formation of geranic acid from myrcene. These results indicated that a novel monoterpene degradation pathway must be present in A. defragrans.
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