Difference between revisions of "Part:BBa K389011"

Revision as of 12:36, 9 October 2010

VirA screening device

This part contains:

- a mutated virG response regulator from the VirA/G receptor system from Agrobacterium tumefaciens which works in Escherichia coli without an rpoA gene from A. tumefaciens

- a kanamycin resistance under the control of a vir promoter

Usage and Biology

This device is used to screen virA receptor mutants. The virA receptor gene is mutated in the BBa_K389010 BioBrick. The better the receptor detects a substance, the more VirG is phosphorylated and the stronger the kanamycin resistance from this BioBrick is expressed. The screening system for a mutated virA gene contains this BioBrick in a plasmid with R6K ori and the BioBrick BBa_K389010 in a plasmid with ColE1 ori. Both plasmids are transformed to and screened in E. coli EC100D because plasmids with R6K ori are only replicated in pir+ or pir116 E. coli strains. Once a receptor with high sensitivity for a screened substance is found, the plasmids are isolated and transformed to e.g. E. coli TOP10. Because the R6K ori does not work in this strain because it is not a pir+ / pir116 strain, it is easy to separate the mutated virA BioBrick from the screening plasmid.

Sequence and Features

Assembly Compatibility:

10
COMPATIBLE WITH RFC[10]
12
INCOMPATIBLE WITH RFC[12]
Illegal NheI site found at 7
Illegal NheI site found at 30
21
COMPATIBLE WITH RFC[21]
23
COMPATIBLE WITH RFC[23]
25
COMPATIBLE WITH RFC[25]
1000
COMPATIBLE WITH RFC[1000]

@@ Line 4: / Line 4: @@
 This part contains:
-- a mutated ''virG'' response regulator from the virA/G receptor system from ''Agrobacterium tumefaciens'' which works in ''Escherichia coli'' without an ''rpoA'' gene from ''A. tumefaciens''
+- a mutated ''virG'' response regulator from the VirA/G receptor system from ''Agrobacterium tumefaciens'' which works in ''Escherichia coli'' without an ''rpoA'' gene from ''A. tumefaciens''
 - a kanamycin resistance under the control of a ''vir'' promoter
@@ Line 11: / Line 11: @@
 ===Usage and Biology===
-This device is used to screen ''virA'' receptor mutants. The ''virA'' receptor is mutated in the <partinfo>BBa_K389010</partinfo> BioBrick. The better the receptor detects a substance, the more ''virG'' is phosphorylated and the stronger the kanamycin resistance from this BioBrick is expressed. The screening system for a mutated virA gene contains this BioBrick in a plasmid with R6K ori and the BioBrick <partinfo>BBa_K389010</partinfo> in a plasmid with ColE1 ori. Both plasmids will be transformed to and screened in ''E. coli'' EC100D. Plasmids with R6K ori are only replicated in pir+ or pir116 ''E. coli'' strains. Once a receptor with high sensitivity for a screened substance is found, the plasmids are isolated and transformed to ''e.g. E. coli'' TOP10. Because the R6K ori does not work in this strain because it is not a pir+ / pir116 strain, it is easy to separate the mutated ''virA'' BioBrick from the screening plasmid.
+This device is used to screen ''virA'' receptor mutants. The ''virA'' receptor gene is mutated in the <partinfo>BBa_K389010</partinfo> BioBrick. The better the receptor detects a substance, the more VirG is phosphorylated and the stronger the kanamycin resistance from this BioBrick is expressed. The screening system for a mutated ''virA'' gene contains this BioBrick in a plasmid with R6K ori and the BioBrick <partinfo>BBa_K389010</partinfo> in a plasmid with ColE1 ori. Both plasmids are transformed to and screened in ''E. coli'' EC100D because plasmids with R6K ori are only replicated in pir+ or pir116 ''E. coli'' strains. Once a receptor with high sensitivity for a screened substance is found, the plasmids are isolated and transformed to ''e.g. E. coli'' TOP10. Because the R6K ori does not work in this strain because it is not a pir+ / pir116 strain, it is easy to separate the mutated ''virA'' BioBrick from the screening plasmid.