Abstract:
:Using the par to rep region of the 24653 bp plasmid pN315, which is present in Staphylococcus aureus strain N315, we constructed three vectors that can be shuttled between Escherichia coli and S. aureus and maintained stably in S. aureus. Due to plasmid incompatibility, the resident plasmid in S. aureus cells can be replaced via transformation with an entering plasmid, which carries a different drug resistance gene. To evaluate the applicability of this plasmid-based approach for identifying genes essential for S. aureus cell growth, the chromosomal mraY gene, which is involved in peptidoglycan biosynthesis, was deleted in cells harboring a resident plasmid with an intact mraY gene. The resultant disruptant was then transformed with an empty vector. Cells with a chromosomal mraY deletion but lacking the plasmid supplying mraY could not be recovered, suggesting that mraY is indispensable for staphylococcal cell growth or viability. In contrast, other two genes were shown to be dispensable by this system. Thus, the pN315-based plasmids appear to be useful for studying genes essential for S. aureus cell growth.
journal_name
Biol Pharm Bulljournal_title
Biological & pharmaceutical bulletinauthors
Matsuo M,Kurokawa K,Lee BL,Sekimizu Kdoi
10.1248/bpb.33.198subject
Has Abstractpub_date
2010-01-01 00:00:00pages
198-203issue
2eissn
0918-6158issn
1347-5215pii
JST.JSTAGE/bpb/33.198journal_volume
33pub_type
杂志文章abstract::The bioavailability of morphine after rectal administration using three types of suppositories containing morphine hydrochloride (10 mg) in different added forms was evaluated in rabbits. Three types of suppositories were constructed with a base material (Witepsol H-15): a conventional suppository containing morphine ...
journal_title:Biological & pharmaceutical bulletin
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abstract::In the present investigation the chemopreventive action of Panax ginseng extract, EFLA400, in Swiss albino mice has been evaluated. We used a 9-week medium term anticarcinogenicity test model of lung adenomas [Yun et al.1)]. Lung adenomas were induced by single subcutaneous injection in the subscapular region with 0.0...
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pub_type: 临床试验,杂志文章
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journal_title:Biological & pharmaceutical bulletin
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journal_title:Biological & pharmaceutical bulletin
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journal_title:Biological & pharmaceutical bulletin
pub_type: 杂志文章
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更新日期:2009-12-01 00:00:00
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journal_title:Biological & pharmaceutical bulletin
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abstract::A traditional Chinese herbal medicine, Qizhu Tang (QZT) was studied for its in vitro antioxidant activity and the effect on cerebral oxidative damage after forebrain ischemia followed by reperfusion in rats. The QZT decoction was shown to have strong hydroxyl radical (*OH) scavenging activity (approx. 0.1 mM as Trolox...
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abstract::Daikenchuto (DKT) has been widely used for the treatment of postsurgical ileus in Japan. However, its effect on postsurgical adhesion formation has been obscure. In this study, the effect of DKT on postsurgical adhesion formation induced by cecum cauterization or cecum abrasion in mice was investigated. First, the exp...
journal_title:Biological & pharmaceutical bulletin
pub_type: 杂志文章
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journal_title:Biological & pharmaceutical bulletin
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journal_title:Biological & pharmaceutical bulletin
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journal_title:Biological & pharmaceutical bulletin
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journal_title:Biological & pharmaceutical bulletin
pub_type: 杂志文章
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pub_type: 杂志文章
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更新日期:2011-01-01 00:00:00