Difference between revisions of "Part:BBa K3254012"
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<partinfo>BBa_K3254012 short</partinfo> | <partinfo>BBa_K3254012 short</partinfo> | ||
| − | This part can be placed downstreamed a | + | This part can be placed downstreamed a promoter. The thermodynamic characteristics of this part were described in the workframe of a previous study(see reference). The RiboJ part was added before the RBS-coding sequence, so that the modularity and reuseability would be improved. |
*We characterized the thermodynamic characterizatics and toxicity of this part, and the orthogonality between int10 and 5 other LSTP using this part. | *We characterized the thermodynamic characterizatics and toxicity of this part, and the orthogonality between int10 and 5 other LSTP using this part. | ||
=Thermodynamic Characterization= | =Thermodynamic Characterization= | ||
| − | *The cis- | + | *The cis-elements used in this experiments were [[Part:BBa_K3254004|BBa_K3254004]] which contains the Int10 att sites. |
| − | *We constructed an IPTG inducible system to control the | + | *We constructed an IPTG inducible system to control the expression level by the IPTG concentration in E.coli DH5α host. |
| − | *The distribution ratios of the cells with original att sites or recombined att sites were measured using a flow cytometry. | + | *The distribution ratios of the cells with original att sites or recombined att sites were measured by using a flow cytometry. |
==Genetic Design== | ==Genetic Design== | ||
| − | *The composition and principle of the experimental system | + | *The composition and principle of the experimental system were indicated below. More details could be seen on the pages of [[Part:BBa_K3254004|BBa_K3254004]]. |
| − | *This part was placed downstream of a Ptac promoter.[[Part:BBa_K3254025|BBa_K3254025]] | + | *This part was placed downstream of a Ptac promoter.[[Part:BBa_K3254025|BBa_K3254025]] could be seen as a reference of device structure. |
[[File:T--GENAS_China--excision_with_backbone.PNG|200px|thumb|left|The composition and principle of the experimental system]] | [[File:T--GENAS_China--excision_with_backbone.PNG|200px|thumb|left|The composition and principle of the experimental system]] | ||
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==Experimental Setup== | ==Experimental Setup== | ||
The two plasmids were co-transformed into E.coli DH5α host. | The two plasmids were co-transformed into E.coli DH5α host. | ||
| − | Then we selected colonies with no observable fluoresce and inoculated into M9 supplemented medium for overnight growth. Then, the cell cultures were diluted 1000-fold with M9 supplemented medium with gradient concentrations of IPTG inducer and growth for another 20 hours. All incubations were carried out using a Digital Thermostatic Shaker maintained at 37 °C and 1000 rpm, using flat-bottom 96-well plates sealed with sealing film. Finally, 3-μL samples each culture were transferred to a new 96-well plate containing 200 μL per well of PBS supplemented with 2 mg/mL kanamycin. The fluorescence distribution of each sample was assayed using a flow cytometry. | + | Then we selected colonies with no observable fluoresce and inoculated into M9 supplemented medium for overnight growth. Then, the cell cultures were diluted 1000-fold with M9 supplemented medium with gradient concentrations of IPTG inducer and growth for another 20 hours. All incubations were carried out using a Digital Thermostatic Shaker maintained at 37 °C and 1000 rpm, using flat-bottom 96-well plates sealed with sealing film. Finally, 3-μL samples each culture were transferred to a new 96-well plate containing 200 μL per well of PBS supplemented with 2 mg/mL kanamycin. The fluorescence distribution of each sample was assayed using a flow cytometry. |
| + | *M9 medium (supplemented）: 6.8 g/L Na<sub>2</sub>HPO<sub>4</sub>, 3 g/L KH<sub>2</sub>PO<sub>4</sub>, 0.5 g/L NaCl, 1 g/L NH<sub>4</sub>Cl, 0.34 g/L thiamine, 0.2% casamino acids, 0.4% glucose, 2 mM MgSO<sub>4</sub>, and 100 μM CaCl<sub>2</sub>. | ||
==Results== | ==Results== | ||
| − | *The recombination rate could be controlled by IPTG concentration and | + | *The recombination rate could be controlled by IPTG concentration and had a narrow hypersensitivity response interval (the orange circle indicate the Int10 testing group). |
| − | *Because the Ptac promoter | + | *Because the Ptac promoter had a nearly-linear response curve (see [[Part:BBa_K3254025|BBa_K3254025]]), it was more likely that the hypersensitivity was due to the characteristics of the integrase itself rather than the characteristics of the transcriptional regulation system. |
[[File:T--GENAS_China--RR-IPTG.png]] | [[File:T--GENAS_China--RR-IPTG.png]] | ||
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=Toxicity Characterization= | =Toxicity Characterization= | ||
*After the 20 hours incubation described in "Thermodynamic Characterization" and before sampling, the OD600 of each well was measured by a microplate reader. | *After the 20 hours incubation described in "Thermodynamic Characterization" and before sampling, the OD600 of each well was measured by a microplate reader. | ||
| − | *The | + | *The differences between the readings of OD600 of each group could be a reference of toxicity characteristic. |
==Results== | ==Results== | ||
| − | *The data points with orange color | + | *The data points with orange color was the results of this part. |
*Compared to other groups, no significant toxicity was observed during induction. | *Compared to other groups, no significant toxicity was observed during induction. | ||
[[File:T--GENAS_China--IPTG-OD600.png]] | [[File:T--GENAS_China--IPTG-OD600.png]] | ||
| − | |||
| − | |||
=Orthogonality Characterization= | =Orthogonality Characterization= | ||
| Line 43: | Line 42: | ||
==Genetic Design== | ==Genetic Design== | ||
| − | Similar to the design of thermodynamic characterization. Each integrase generator plasmid | + | Similar to the design of thermodynamic characterization. Each integrase generator plasmid was co-transferred with 6 plasmid containing different sets of cis-elements. |
==Experimental Setup== | ==Experimental Setup== | ||
| − | The growth condition | + | The growth condition was similar to the thermodynamic characterization but every sample was full induced with 500 μM IPTG. Then we used specific primers to identify the genotype of att sites by PCR. The principle of genotype identification was shown on the right of result image. |
==Results== | ==Results== | ||
| − | The results | + | The results indicated that Int10 integrase had a good orthogonality with the other 5 att sites and compatible with other integrases. |
IBR-C35/F55/S37/E21/T25/G22 were the plasmids with phiC31/Int5/Int7/Int8/Int10/TG1 att sites. | IBR-C35/F55/S37/E21/T25/G22 were the plasmids with phiC31/Int5/Int7/Int8/Int10/TG1 att sites. | ||
| Line 60: | Line 59: | ||
<!-- --> | <!-- --> | ||
<span class='h3bb'>Sequence and Features</span> | <span class='h3bb'>Sequence and Features</span> | ||
| − | <partinfo>BBa_K3254012 | + | <partinfo>BBa_K3254012 Sequence And Features</partinfo> |
Latest revision as of 13:31, 21 October 2019
Translational Unit for Int10 integrase
This part can be placed downstreamed a promoter. The thermodynamic characteristics of this part were described in the workframe of a previous study(see reference). The RiboJ part was added before the RBS-coding sequence, so that the modularity and reuseability would be improved.
- We characterized the thermodynamic characterizatics and toxicity of this part, and the orthogonality between int10 and 5 other LSTP using this part.
Thermodynamic Characterization
- The cis-elements used in this experiments were BBa_K3254004 which contains the Int10 att sites.
- We constructed an IPTG inducible system to control the expression level by the IPTG concentration in E.coli DH5α host.
- The distribution ratios of the cells with original att sites or recombined att sites were measured by using a flow cytometry.
Genetic Design
- The composition and principle of the experimental system were indicated below. More details could be seen on the pages of BBa_K3254004.
- This part was placed downstream of a Ptac promoter.BBa_K3254025 could be seen as a reference of device structure.
Experimental Setup
The two plasmids were co-transformed into E.coli DH5α host. Then we selected colonies with no observable fluoresce and inoculated into M9 supplemented medium for overnight growth. Then, the cell cultures were diluted 1000-fold with M9 supplemented medium with gradient concentrations of IPTG inducer and growth for another 20 hours. All incubations were carried out using a Digital Thermostatic Shaker maintained at 37 °C and 1000 rpm, using flat-bottom 96-well plates sealed with sealing film. Finally, 3-μL samples each culture were transferred to a new 96-well plate containing 200 μL per well of PBS supplemented with 2 mg/mL kanamycin. The fluorescence distribution of each sample was assayed using a flow cytometry.
- M9 medium (supplemented）: 6.8 g/L Na2HPO4, 3 g/L KH2PO4, 0.5 g/L NaCl, 1 g/L NH4Cl, 0.34 g/L thiamine, 0.2% casamino acids, 0.4% glucose, 2 mM MgSO4, and 100 μM CaCl2.
Results
- The recombination rate could be controlled by IPTG concentration and had a narrow hypersensitivity response interval (the orange circle indicate the Int10 testing group).
- Because the Ptac promoter had a nearly-linear response curve (see BBa_K3254025), it was more likely that the hypersensitivity was due to the characteristics of the integrase itself rather than the characteristics of the transcriptional regulation system.
Toxicity Characterization
- After the 20 hours incubation described in "Thermodynamic Characterization" and before sampling, the OD600 of each well was measured by a microplate reader.
- The differences between the readings of OD600 of each group could be a reference of toxicity characteristic.
Results
- The data points with orange color was the results of this part.
- Compared to other groups, no significant toxicity was observed during induction.
Orthogonality Characterization
We conducted orthogonality tests to see the compatibility between the 6 integrase used in our project. The other integrases include phiC31, Int5, Int7, Int8 and TG1.
Genetic Design
Similar to the design of thermodynamic characterization. Each integrase generator plasmid was co-transferred with 6 plasmid containing different sets of cis-elements.
Experimental Setup
The growth condition was similar to the thermodynamic characterization but every sample was full induced with 500 μM IPTG. Then we used specific primers to identify the genotype of att sites by PCR. The principle of genotype identification was shown on the right of result image.
Results
The results indicated that Int10 integrase had a good orthogonality with the other 5 att sites and compatible with other integrases. IBR-C35/F55/S37/E21/T25/G22 were the plasmids with phiC31/Int5/Int7/Int8/Int10/TG1 att sites.
Sequence and Features
BBa_K3254012 Sequence And Features Not understood