Difference between revisions of "Part:BBa K932000"
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===Usage and Biology=== | ===Usage and Biology=== | ||
| − | Controlled by the tet repressible promoter, the | + | Controlled by the tet repressible promoter, the OmpR234 protein expresses constitutively in the absence of the TetR protein. EnvZ is a phosphorylase kinase involved in activation of OmpR, a transcription factor. OmpR activates the expression of the csgD operon, which codes for the curli proteins. These enzymes, once expressed on the outer membrane, assemble fibrous filaments involved in cell-surface and cell-cell adhesion. We expect expression of this part to enhance transcriptional activation of the curli proteins and consequent filament assembly. Cells containing this construct should aggregate more rapidly, thus becoming more amenable to the formation of biofilms. |
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[[Image:GrowthCurve.tif|center]] | [[Image:GrowthCurve.tif|center]] | ||
Expression of the EnvZ protein under the tet promoter does not appear to affect growth. | Expression of the EnvZ protein under the tet promoter does not appear to affect growth. | ||
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[[Image:Thioflavin_T.jpg|center]] | [[Image:Thioflavin_T.jpg|center]] | ||
| + | Using the Thioflavin T fluorescence assay detailed by Shu, et al. PNAS 2012, we found that BL-21 E. coli cells containing BBa_K392000 express curli at significantly higher (p < 0.001, n = 6, T-test for comparison of means) than control cells. | ||
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| + | [[Image:Static_Biofilm_S.jpg|center]] | ||
| + | BBa_K932000 significantly enhances formation of static biofilms. | ||
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| + | References: <br> | ||
| + | Curnow, P, Bessette PH, et al. ''Enzymatic Synthesis of Layered Titanium Phosphates at Low Temperature and Neutral pH by Cell-Surface Display of Silicatein-alpha.'' (2006) J. Am. Chem. Soc. '''127''': 15749-15755. | ||
<span class='h3bb'>Sequence and Features</span> | <span class='h3bb'>Sequence and Features</span> | ||
Latest revision as of 13:34, 13 October 2012
OmpR234 under Tet Repressible Promoter
This part promotes the constitutive expression of the curli cluster (csgD), proteins involved in cell-cell adhesion.
Usage and Biology
Controlled by the tet repressible promoter, the OmpR234 protein expresses constitutively in the absence of the TetR protein. EnvZ is a phosphorylase kinase involved in activation of OmpR, a transcription factor. OmpR activates the expression of the csgD operon, which codes for the curli proteins. These enzymes, once expressed on the outer membrane, assemble fibrous filaments involved in cell-surface and cell-cell adhesion. We expect expression of this part to enhance transcriptional activation of the curli proteins and consequent filament assembly. Cells containing this construct should aggregate more rapidly, thus becoming more amenable to the formation of biofilms.
SEM images of E. coli BL-21 DE3 cells not expressing (left) and expressing (right) BBa_K932000. Expression qualitatively enhances cellular aggregation.
Expression of the EnvZ protein under the tet promoter does not appear to affect growth.
Using the Thioflavin T fluorescence assay detailed by Shu, et al. PNAS 2012, we found that BL-21 E. coli cells containing BBa_K392000 express curli at significantly higher (p < 0.001, n = 6, T-test for comparison of means) than control cells.
BBa_K932000 significantly enhances formation of static biofilms.
References:
Curnow, P, Bessette PH, et al. Enzymatic Synthesis of Layered Titanium Phosphates at Low Temperature and Neutral pH by Cell-Surface Display of Silicatein-alpha. (2006) J. Am. Chem. Soc. 127: 15749-15755.
Sequence and Features
- 10COMPATIBLE WITH RFC[10]
- 12COMPATIBLE WITH RFC[12]
- 21COMPATIBLE WITH RFC[21]
- 23COMPATIBLE WITH RFC[23]
- 25COMPATIBLE WITH RFC[25]
- 1000COMPATIBLE WITH RFC[1000]