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horC confers beer-spoilage ability on hop-sensitive Lactobacillus brevis ABBC45cc
被引:0
|作者:
Iijima, K.
[1
,2
]
Suzuki, K.
[1
]
Ozaki, K.
[1
]
Yamashita, H.
[1
]
机构:
[1] Analytical Technology Laboratory, Asahi Breweries, Ltd., Ibaraki, Japan
[2] Analytical Technology Laboratory, Asahi Breweries, Ltd., 1-21, Midori 1-chome, Moriya-shi, Ibaraki 302-0106, Japan
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Aims: To determine whether horC confers beer-spoilage ability and to evaluate the validity of horC as a trans-species genetic marker for differentiating the beer-spoilage ability of lactic acid bacteria (LAB). Methods and Results: Hop-sensitive Lactobacillus brevis ABBC45cc was transformed with an expression plasmid;
pHYchorBC;
containing putative multidrug resistance gene horC and its putative regulator horB;
and the transformant was designated as ABBC45cc/pHYchorBC. As a control;
ABBC45cc was transformed with pHYchorB that contains horB;
and the transformed strain was designated as ABBC45cc/pHYchorB. As a result of beer-spoilage assay of these transformants;
ABBC45cc/pHYchorBC exhibited beer-spoilage ability;
whereas ABBC45cc/pHYchorB did not. Furthermore ABBC45 cc/pHYchorBC showed higher hop resistance than ABBC45 cc/pHYchorB;
accounting for the differences in beer-spoilage ability observed between the two transformants. ABBC45cc/pHYchorBC also exhibited higher resistance to various structurally unrelated drugs;
compared with ABBC45cc/pHYchorB. Conclusions: horC was shown to confer hop resistance and beer-spoilage ability on ABBC45cc by presumably encoding a multidrug transporter. Significance and Impact of the Study: The finding that horC plays an important role in hop resistance and beer-spoilage ability supports the validity of horC as a trans-species genetic marker for differentiating the beer-spoilage ability of LAB. © 2006 The Society for Applied Microbiology;
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页码:1282 / 1288
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