Difference between revisions of "Part:BBa K3739052"
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<partinfo>BBa_K3739052 short</partinfo> | <partinfo>BBa_K3739052 short</partinfo> | ||
− | + | We anchor LCIKR-2 protein onto membranes through OmpA to stick the engineered bacteria on the polypropylene. We use <partinfo>BBa_K3739052</partinfo> to construct the expression system and anchor LCIKR-2 on the surface of VnDX. | |
+ | |||
+ | ===Biology=== | ||
+ | OmpA is an anchor protein from E. coli, also find in Vibrio Species, which can anchor its passenger protein to the cell membrane. It has been widely used in cell-surface display. LCIKR-2, A mutant of a peptide called LCI from ''Bacillus subtilis'', can sticks to polypropylene strongly. LCIKR-2 is fused at C terminal with Lpp-OmpA so that LCIKR-2 can be displayed on the surface of VnDX. | ||
+ | |||
+ | |||
+ | ===Usage=== | ||
+ | Here, we use BBa_3739052 to achieve surface display of LCIKR-2 on VnDX to help the VnDX adhere to polypropylene. | ||
+ | |||
+ | ===Characterization=== | ||
+ | ====1. Identification==== | ||
+ | We attempt to display the plastic-binding protein on the surface of ''Vibrio natriegens'' through OmpA, which could endow the ability of plastic-binding to ''Vibrio natriegens''. The gene of OmpA-LCIKR-2-GFP (Fig. 4A, BBa_K3739025) was assembled into the plasmid backbone and transformed into ''Vibrio natriegens'' through electroporation. After being verified by agarose gel electrophoresis, the plasmids have been transformed into ''Vibrio natriegens'' successfully (Fig. 1B). | ||
+ | "https://static.igem.org/mediawiki/parts/4/40/T--XMU-China--K3739052.png" | ||
+ | ::'''Fig. 1.''' Gene circuit and agarose gel electrophoresis. (A) Gene circuit of J23100-B0030-OmpA-LC1KR-2-GFP-B0010 (BBa_K3739052). (B) Target bands of J23100-B0030-OmpA-LC1KR-2-GFP-B0010 (black arrow, 2100 bp). | ||
+ | |||
+ | ====2. Proof of the expression==== | ||
+ | After successful construction and transformation, the experiment was carried out to verify whether the OmpA-LCIKR-2-GFP was expressed and located on the membrane of ''Vibrio natriegens''. Thus, the total membrane proteins were extracted to verify the expression of the OmpA-LCIKR-2-GFP. However, the complicated component of the membrane proteins also seriously hinders the analysis of SDS-PAGE (Fig. 2). | ||
+ | https://static.igem.org/mediawiki/parts/5/5f/T--XMU-China--OLG.png | ||
+ | ::'''Fig. 2.''' SDS-PAGE analysis of J23100-B0030-OmpA-LC1KR-2-GFP-B0010 by coomassie blue staining. Target bands of OmpA-LC1KR-2-GFP (red box, 61.7 kDa). | ||
+ | |||
+ | The western blot analysis was performed, in which the GFP in fusion protein serves as the antigen, and the experimental results are shown in Figure 3. The targeted band was observed in the precalculated position in the western blot results, suggesting that the plastic-binding protein (OmpA-LCIKR-2-GFP) was successfully anchored on the surface of ''Vibrio natriegens''. | ||
+ | |||
+ | [[File:T--XMU-China--OGWB.png]] | ||
+ | ::'''Fig. 3.''' Western Blot analysis of J23100-B0030-OmpA-LC1KR-2-GFP-B0010. Target bands of OmpA-LCIKR-2-GFP (white arrow, 61.7 kDa). | ||
+ | |||
+ | ====3. Verify the plastic binding ability of ''Vibrio natriegens'' with plastic-binding proteins on their surface==== | ||
+ | After successfully displaying the plastic binding protein on the membrane, an experiment was designed to investigate the biding ability of Vibrio natriegens to the plastic microsphere. Firstly, the ''Vibrio natriegens'' was cultivated until its OD<sub>600</sub> reached 0.6, in which OmpA-LCIKR-2-GFP was the experimental group and OmpA-GFP was the control group. Secondly, chloramphenicol was added to the culture solution to inhibit the growth, in which the working concentration was 12.5 μg/mL. Thirdly, after the OD<sub>600</sub> maintained a stable value, a plastic microsphere was added to the culture solution (0.5 g/mL). Take samples every 5 minutes and measure the OD600 value. As shown in Fig. 4, compared with that in the group of OmpA-GFP (none plastic-binding), the OD<sub>600</sub> of the OmpA-LCIKR-2-GFP (plastic-binding) decreased markedly. The significant difference demonstrated that the plastic-binding protein (LCIKR-2) displayed in the membrane endow the Vibrio natriegens with the excellent performance of plastic-binding. | ||
+ | [[File:T--XMU-China--SFDA.png]] | ||
+ | ::'''Fig. 4.''' Binding ability of engineered Vibrio natriegens to plastic. (A) The effect from adding plastic microsphere on the OD<sbumit 600> in experiment group (OmpA-LCIKR-2-GFP display on the surface of Vibrio natriegens) and control group (OmpA-GFP display on the surface of Vibrio natriegens). (B) Time course of ∆OD<sub>600</sub>. ∆OD<sub>600</sub>: The value of OD<sub>600</sub> in each time minus the value of OD<sub>600</sub> at the time of 0. **** = p < 0.0001. | ||
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Latest revision as of 01:21, 22 October 2021
J23100-B0030-OmpA-LC1KR-2-GFP-B0010
We anchor LCIKR-2 protein onto membranes through OmpA to stick the engineered bacteria on the polypropylene. We use BBa_K3739052 to construct the expression system and anchor LCIKR-2 on the surface of VnDX.
Biology
OmpA is an anchor protein from E. coli, also find in Vibrio Species, which can anchor its passenger protein to the cell membrane. It has been widely used in cell-surface display. LCIKR-2, A mutant of a peptide called LCI from Bacillus subtilis, can sticks to polypropylene strongly. LCIKR-2 is fused at C terminal with Lpp-OmpA so that LCIKR-2 can be displayed on the surface of VnDX.
Usage
Here, we use BBa_3739052 to achieve surface display of LCIKR-2 on VnDX to help the VnDX adhere to polypropylene.
Characterization
1. Identification
We attempt to display the plastic-binding protein on the surface of Vibrio natriegens through OmpA, which could endow the ability of plastic-binding to Vibrio natriegens. The gene of OmpA-LCIKR-2-GFP (Fig. 4A, BBa_K3739025) was assembled into the plasmid backbone and transformed into Vibrio natriegens through electroporation. After being verified by agarose gel electrophoresis, the plasmids have been transformed into Vibrio natriegens successfully (Fig. 1B). ""
- Fig. 1. Gene circuit and agarose gel electrophoresis. (A) Gene circuit of J23100-B0030-OmpA-LC1KR-2-GFP-B0010 (BBa_K3739052). (B) Target bands of J23100-B0030-OmpA-LC1KR-2-GFP-B0010 (black arrow, 2100 bp).
2. Proof of the expression
After successful construction and transformation, the experiment was carried out to verify whether the OmpA-LCIKR-2-GFP was expressed and located on the membrane of Vibrio natriegens. Thus, the total membrane proteins were extracted to verify the expression of the OmpA-LCIKR-2-GFP. However, the complicated component of the membrane proteins also seriously hinders the analysis of SDS-PAGE (Fig. 2).
- Fig. 2. SDS-PAGE analysis of J23100-B0030-OmpA-LC1KR-2-GFP-B0010 by coomassie blue staining. Target bands of OmpA-LC1KR-2-GFP (red box, 61.7 kDa).
The western blot analysis was performed, in which the GFP in fusion protein serves as the antigen, and the experimental results are shown in Figure 3. The targeted band was observed in the precalculated position in the western blot results, suggesting that the plastic-binding protein (OmpA-LCIKR-2-GFP) was successfully anchored on the surface of Vibrio natriegens.
- Fig. 3. Western Blot analysis of J23100-B0030-OmpA-LC1KR-2-GFP-B0010. Target bands of OmpA-LCIKR-2-GFP (white arrow, 61.7 kDa).
3. Verify the plastic binding ability of Vibrio natriegens with plastic-binding proteins on their surface
After successfully displaying the plastic binding protein on the membrane, an experiment was designed to investigate the biding ability of Vibrio natriegens to the plastic microsphere. Firstly, the Vibrio natriegens was cultivated until its OD600 reached 0.6, in which OmpA-LCIKR-2-GFP was the experimental group and OmpA-GFP was the control group. Secondly, chloramphenicol was added to the culture solution to inhibit the growth, in which the working concentration was 12.5 μg/mL. Thirdly, after the OD600 maintained a stable value, a plastic microsphere was added to the culture solution (0.5 g/mL). Take samples every 5 minutes and measure the OD600 value. As shown in Fig. 4, compared with that in the group of OmpA-GFP (none plastic-binding), the OD600 of the OmpA-LCIKR-2-GFP (plastic-binding) decreased markedly. The significant difference demonstrated that the plastic-binding protein (LCIKR-2) displayed in the membrane endow the Vibrio natriegens with the excellent performance of plastic-binding.
- Fig. 4. Binding ability of engineered Vibrio natriegens to plastic. (A) The effect from adding plastic microsphere on the OD<sbumit 600> in experiment group (OmpA-LCIKR-2-GFP display on the surface of Vibrio natriegens) and control group (OmpA-GFP display on the surface of Vibrio natriegens). (B) Time course of ∆OD600. ∆OD600: The value of OD600 in each time minus the value of OD600 at the time of 0. **** = p < 0.0001.
Sequence and Features
- 10COMPATIBLE WITH RFC[10]
- 12INCOMPATIBLE WITH RFC[12]Illegal NheI site found at 7
Illegal NheI site found at 30 - 21COMPATIBLE WITH RFC[21]
- 23COMPATIBLE WITH RFC[23]
- 25COMPATIBLE WITH RFC[25]
- 1000INCOMPATIBLE WITH RFC[1000]Illegal SapI.rc site found at 494
Illegal SapI.rc site found at 1109