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Anaerobic biosynthesis of unsaturated fatty acids in the cyanobacterium, Oscillatoria limneticaThe mechanism for synthesis of monounsaturated fatty acids under aerobic and anaerobic conditions was studied in the facultative anaerobic cyanobacterium, Oscillatoria limnetica. The hexadecenoic acid (C16:1) of aerobically grown O. limnetica was shown to contain both the delta 7 (79%) and delta 9 (21%) isomers, while the octadecenoic (C18:1) acid was entirely the delta 9 acid. Incorporation of [2-14C] acetate into the fatty acids under aerobic conditions resulted in synthesis of the delta 7 and delta 9 C16:1 and the delta 9 C18:1. Synthesis of unsaturated fatty acids in the presence of DCMU required sulfide. Anaerobic incubations in the presence of DCMU and sulfide (less than 0.003% atmospheric oxygen) resulted in a two-fold increase in monounsaturated fatty acids of both delta 7 and delta 9 C16:1 and delta 9 and delta 11 C18:1. The synthesis of these is characteristic of a bacterial-type, anaerobic pathway.
Document ID
20040089052
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
External Source(s)
Authors
Jahnke, L. L.
(NASA Ames Research Center Moffett Field CA United States)
Lee, B.
Sweeney, M. J.
Klein, H. P.
Date Acquired
August 21, 2013
Publication Date
January 1, 1989
Publication Information
Publication: Archives of microbiology
Volume: 152
ISSN: 0302-8933
Subject Category
Exobiology
Funding Number(s)
CONTRACT_GRANT: NCA2-226
Distribution Limits
Public
Copyright
Other
Keywords
NASA Discipline Exobiology
NASA Center ARC

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