Difference between revisions of "Part:BBa K3032127"

Latest revision as of 23:10, 16 October 2019

Light-regulated plasmid copy number device (0.86)

The system based on re-engineered ColE1 origin of replication allowing to regulate plasmid copy number in E. coli cells with light. ColE1 plasmid replicon is based on two antisense RNA molecules: RNA I and RNA II. RNA II transcript of forms a RNA-DNA duplex with plasmid and acts as a primer for DNA polymerase. For that reason, RNA II is often called a replication initiator. However, another molecule - RNA I may bind to its antisense version of RNA II, which results in replication inhibition.

Jayraman et al. (2016) engineered a novel bidirectional promoter system for Escherichia coli that can be induced or repressed rapidly and reversibly using the blue light dependent DNA-binding protein EL222. Inserting EL222 binding sequence between -35 and -10 promoter regions led to greater than 3-fold reduction in RFP fluorescence when the engineered E. coli was exposed to blue light.

Vilnius-Lithuania iGEM 2019 combined RNA I/RNA II with EL222 protein to develop light-regulated system for plasmid copy number control. EL222 binding sequence was inserted between -35 and -10 regions of strong Anderson promoter (BBa_J23102), controlling transcription of the replication inhibiting – RNA I molecule. In blue light illumination EL222 protein binds to RNA I promoter. Inhibited transcription results reduced formation of RNA II-RNA I duplex and expanded plasmid copy number.

Sequence and Features

Assembly Compatibility:

10
COMPATIBLE WITH RFC[10]
12
INCOMPATIBLE WITH RFC[12]
Illegal NheI site found at 709
21
COMPATIBLE WITH RFC[21]
23
COMPATIBLE WITH RFC[23]
25
COMPATIBLE WITH RFC[25]
1000
COMPATIBLE WITH RFC[1000]

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 <partinfo>BBa_K3032127 short</partinfo>
-a
+The system based on re-engineered ColE1 origin of replication allowing to regulate plasmid copy number in E. coli cells with light. ColE1 plasmid replicon is based on two antisense RNA molecules: RNA I and RNA II. RNA II transcript of forms a RNA-DNA duplex with plasmid and acts as a primer for DNA polymerase. For that reason, RNA II is often called a replication initiator. However, another molecule - RNA I may bind to its antisense version of RNA II, which results in replication inhibition.
+Jayraman et al. (2016) engineered a novel bidirectional promoter system for Escherichia coli that can be induced or repressed rapidly and reversibly using the blue light dependent DNA-binding protein EL222. Inserting EL222 binding sequence between -35 and -10 promoter regions led to greater than 3-fold reduction in RFP fluorescence when the engineered E. coli was exposed to blue light.
+Vilnius-Lithuania iGEM 2019 combined RNA I/RNA II with EL222 protein to develop light-regulated system for plasmid copy number control. EL222 binding sequence was inserted between -35 and -10 regions of strong Anderson promoter (BBa_J23102), controlling transcription of the replication inhibiting – RNA I molecule. In blue light illumination EL222 protein binds to RNA I promoter. Inhibited transcription results reduced formation of RNA II-RNA I duplex and expanded plasmid copy number.
 <!-- Add more about the biology of this part here