Difference between revisions of "Part:BBa K1075036"

Revision as of 21:21, 1 October 2013

AraC-pBAD-RBS32-ccdA-ssrA-TT

CcdA inhibits the toxin ccdB by binding to it and thus represses cell death. The part contains ccdA with a ssrA tag under the control of the ara operon.

Usage and Biology

The ccd module is a toxin-antitoxin (TA) system. The module naturally occurs on the F Plasmid in Escherichia coli bacteria and is essential for their survival. Normally the toxin ccdB is inactivated by the presence of the antitoxin ccdA in the form of a ccdAB complex. If ccdA is no longer available, ccdB inhibits DNA gyrase which leads to cell death. Gyrase is a type IIA topoisomerase specific to E. coli and is able to produce negative DNA supercoiling by making a double-strand break in the DNA and religating it. CcdB stabilizes the gyrase cleavage complex and thus blocks the catalytic function of the gyrase. That means that the gyrase remains bound to the DNA and the cleaved DNA is not religated. DNA- and RNA polymerases can’t copy the DNA anymore and cell proliferation as well as protein biosynthesis is stopped. The double-stranded breaks in the DNA initiate cell death.

Sequence and Features

Assembly Compatibility:

10
COMPATIBLE WITH RFC[10]
12
COMPATIBLE WITH RFC[12]
21
INCOMPATIBLE WITH RFC[21]
Illegal BamHI site found at 1144
23
COMPATIBLE WITH RFC[23]
25
INCOMPATIBLE WITH RFC[25]
Illegal NgoMIV site found at 1574
Illegal NgoMIV site found at 1746
Illegal AgeI site found at 979
Illegal AgeI site found at 2097
1000
INCOMPATIBLE WITH RFC[1000]
Illegal SapI site found at 961

@@ Line 1: / Line 1: @@
 __NOTOC__
 <partinfo>BBa_K1075036 short</partinfo>
-a
+CcdA inhibits the toxin ccdB by binding to it and thus represses cell death. The part contains ccdA with a ssrA tag under the control of the ara operon.
-<!-- Add more about the biology of this part here
 ===Usage and Biology===
+The ccd module is a toxin-antitoxin (TA) system. The module naturally occurs on the F Plasmid in Escherichia coli bacteria and is essential for their survival. Normally the toxin ccdB is inactivated by the presence of the antitoxin ccdA in the form of a ccdAB complex. If ccdA is no longer available, ccdB inhibits DNA gyrase which leads to cell death. Gyrase is a type IIA topoisomerase specific to E. coli and is able to produce negative DNA supercoiling by making a double-strand break in the DNA and religating it. CcdB stabilizes the gyrase cleavage complex and thus blocks the catalytic function of the gyrase. That means that the gyrase remains bound to the DNA and the cleaved DNA is not religated. DNA- and RNA polymerases can’t copy the DNA anymore and cell proliferation as well as protein biosynthesis is stopped. The double-stranded breaks in the DNA initiate cell death.
 <!-- -->