Document Detail

A new strain of Butyrivibrio fibrisolvens that has high ability to isomerize linoleic acid to conjugated linoleic acid.
MedLine Citation:
PMID:  15942871     Owner:  NLM     Status:  MEDLINE    
A new strain of Butyrivibrio fibrisolvens (TH1) that has high potential to produce conjugated linoleic acid (CLA) was isolated. Strain TH1 had higher LA isomerase (LA-I) activity, and was much more tolerant to linoleic acid (LA) than other strains examined. However, high CLA reductase (CLA-R) activity resulted in the temporary accumulation of CLA and subsequent conversion to trans-vaccenic acid (t-VA). When LA was added to growing TH1 cultures in a solution with dimethylsulfoxide (LA/DMSO), CLA produced was greater than when LA was added in a mixture with bovine serum albumin (BSA). The number of viable cells decreased upon addition of LA/DMSO, but then increased as the CLA decreased upon its conversion to t-VA. This result suggests that B. fibrisolvens can resume growing by the removal of CLA from the cells. Most CLA was released from B. fibrisolvens cells by gentle washing with BSA, suggesting that CLA bound to the cells might be removed in the rumen and large intestine. Thus, CLA production by B. fibrisolvens in the digestive tract could be increased by a reduction in CLA-R activity without accompanying an overall decrease in the cell number of B. fibrisolvens. Fatty acids (FAs) with 18 carbon backbone inducted LA-I activity, whereas unsaturated FAs induced CLA-R activity, suggesting that FAs stimulate the synthesis of LA-I and CLA-R. Providing a diet with a low ratio of unsaturated to saturated FAs may favor CLA production.
Shinji Fukuda; Hideki Furuya; Yuhgi Suzuki; Narito Asanuma; Tsuneo Hino
Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  The Journal of general and applied microbiology     Volume:  51     ISSN:  0022-1260     ISO Abbreviation:  J. Gen. Appl. Microbiol.     Publication Date:  2005 Apr 
Date Detail:
Created Date:  2005-06-08     Completed Date:  2005-07-05     Revised Date:  2008-02-01    
Medline Journal Info:
Nlm Unique ID:  0165543     Medline TA:  J Gen Appl Microbiol     Country:  Japan    
Other Details:
Languages:  eng     Pagination:  105-13     Citation Subset:  IM    
Department of Life Science, Meiji University, Tama-ku, Kawasaki, Japan.
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MeSH Terms
Butyrivibrio / classification,  metabolism*
Dimethyl Sulfoxide / pharmacology
Linoleic Acid / metabolism*
Linoleic Acids, Conjugated / metabolism*
Oxidoreductases Acting on CH-CH Group Donors / metabolism
Serum Albumin, Bovine / pharmacology
Reg. No./Substance:
0/Linoleic Acids, Conjugated; 0/Serum Albumin, Bovine; 2197-37-7/Linoleic Acid; 67-68-5/Dimethyl Sulfoxide; EC 1.1.-/conjugated linoleic acid reductase, Butyrivibrio fibrisolvens; EC 1.3.-/Oxidoreductases Acting on CH-CH Group Donors

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