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Team:UT-Tokyo/Project/Inhibition/Discussion
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| + | ==Section-1== | ||
| + | LacI represses the frequently used promoter, pLac. The binding of LacI to pLac is competitively inhibited and the repression of pLac is weakened by introducing 8 LacI-binding-sites on pSB1C3 (a high-copy-plasmid). | ||
| + | By introducing 8 tandem repeats of LacI binding sites on pSB1C3 in addition to pLac-RBS-GFP-d.term on pSB1A2, it is expected that the binding of LacI to pLac is competitively inhibited which can be visually tracked by GFP expression. Moreover, longer LacI binding sites (more than 8 binding sites) is thought to capture more LacI and enhance GFP expression more effectively. | ||
| + | ==Section-2== | ||
| + | rocF is the gene coding the enzyme that converts L-arginine to L-ornithine and urea. By introducing rocF, e.coli obtains the urea cycle. ArgR is the common repressor of the bacterial arginine biosynthetic genes. By introducing ArgR binding sites, the probability that ArgR binds to the operator of the arginine biosynthetic genes falls and arginine biosynthesis is derepressed. (Tokyo Tech 2011) | ||
| + | By introducing ArgR binding sites (including 8 binding sites) on pSB1C3 (high-copy-plasmid) in addition to Ptrc-RBS-rocF on pSB6A1 (low-copy-plasmid), ArgR is sequestered by ArgR binding sites and arginine biosynthesis is derepressed, so that urea production rate is expected to rise compared to Ptrc-RBS-rocF on low-copy-plasmid / ArgR binding site on high-copy-plasmid (Tokyo Tech 2011). Furthermore, although a single ArgR binding site introduced downstream of Ptrc-RBS-rocF did not derepress arginine biosynthesis, it is thought that sufficiently long ArgR binding sites introduced downstream the Ptrc-RBS-rocF binds to many more ArgR proteins and derepresses arginine biosynthesis, consequently enhancing the urea production rate. | ||
== 編集の仕方 == | == 編集の仕方 == | ||
Revision as of 21:48, 26 September 2012
Inhibition without Knockout:Discussion
このページの概要を、簡単に記述。
Section-1
LacI represses the frequently used promoter, pLac. The binding of LacI to pLac is competitively inhibited and the repression of pLac is weakened by introducing 8 LacI-binding-sites on pSB1C3 (a high-copy-plasmid). By introducing 8 tandem repeats of LacI binding sites on pSB1C3 in addition to pLac-RBS-GFP-d.term on pSB1A2, it is expected that the binding of LacI to pLac is competitively inhibited which can be visually tracked by GFP expression. Moreover, longer LacI binding sites (more than 8 binding sites) is thought to capture more LacI and enhance GFP expression more effectively.
Section-2
rocF is the gene coding the enzyme that converts L-arginine to L-ornithine and urea. By introducing rocF, e.coli obtains the urea cycle. ArgR is the common repressor of the bacterial arginine biosynthetic genes. By introducing ArgR binding sites, the probability that ArgR binds to the operator of the arginine biosynthetic genes falls and arginine biosynthesis is derepressed. (Tokyo Tech 2011) By introducing ArgR binding sites (including 8 binding sites) on pSB1C3 (high-copy-plasmid) in addition to Ptrc-RBS-rocF on pSB6A1 (low-copy-plasmid), ArgR is sequestered by ArgR binding sites and arginine biosynthesis is derepressed, so that urea production rate is expected to rise compared to Ptrc-RBS-rocF on low-copy-plasmid / ArgR binding site on high-copy-plasmid (Tokyo Tech 2011). Furthermore, although a single ArgR binding site introduced downstream of Ptrc-RBS-rocF did not derepress arginine biosynthesis, it is thought that sufficiently long ArgR binding sites introduced downstream the Ptrc-RBS-rocF binds to many more ArgR proteins and derepresses arginine biosynthesis, consequently enhancing the urea production rate.
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