Part:BBa_K4195049
pirA_g1αR_B
This sequence is the second part of guide designed for detection of toxin gene pirA.
Biology
Ribozyme ENabled Detection of RNA (RENDR)
RENDR is a high-performing, plug-and-play RNA-sensing platform (1). RENDR utilizes a split variant of the Tetrahymena thermophila ribozyme by synthetically splitting it into two non-functional fragments (Fig. 1). Two fragments are each appended with designed RNA guide sequences, which can interact with the RNA input of interest. The split ribozyme is then inserted within a desired gene output. When bound with the RNA input, two transcribed split ribozyme fragments are triggered to self-splice and thus the intact transcript of the protein output will form.
Fig. 1 Schematic illustration of RENDR.
AmpC
β-lactamase (AmpC) is a bacterial enzyme that facilitates resistance against β-lactam antibiotics by hydrolyzing the β-lactam ring, deactivating the antibiotic. It can also catalyze the hydrolysis reaction of nitrocefin, resulting in a distinct color change from yellow to red(1).
Fig. 2 The color transformation catalyzed by AmpC.
Usage and design
The conserved region of pirA gene is set as the RNA input. The guide sequences were designed based on NUPACK prediction (3). Based on the model provided (Equation. 1), we calculate the free energy difference of candidate sequences at 37 °C, and select guide pair g1 and g2 with 244.16 kcal/mol and 232.86 kcal/mol (Fig. 3). The optimized ribozyme split sites are selected from the literature, and named α (split site 15) and β (split site 402) (1).
Equation. 1 ln(FL/OD) ~ΔGGuide 1 + ΔGGuide 2 + ΔGRNA input − ΔGSC.
Fig. 3 The MFE structure of g1 guide-input complex at 37℃. ΔGGuide1 and ΔGGuide2 = The minimum free energy (MFE) of the two RNA guide sequences attached to each fragment of the RENDR ribozyme. ΔGRNAinput = The MFE of the RNA input. ΔGSC = The duplex binding energy of the complex. ΔGGuide1= -11.5 kcal/mol, ΔGGuide2= -17.0 kcal/mol, ΔGRNAinput= -38.0 kcal/mol, ΔGSC= -310.66 kcal/mol, ΔGGuide 1 + ΔGGuide 2 + ΔGRNA input − ΔGSC= 244.16 kcal/mol.
β-lactamase (AmpC) was chosen as the reporter, and the split ribozyme was inserted between the Ribosome-binding site and the coding sequence of reporter gene. Two parts of the split ribozyme are separately transcribed with different transcription start sites. We separately designed two split ribozymes as different parts BBa_K4195049 and BBa_K4195076, then the combined one (BBa_K4195156) was assembled into the vector pSB3K3 by standard BioBrick assembly. The constructed plasmids were transformed into E. coli BL21(DE3), then the positive transformants were selected by kanamycin and confirmed by colony PCR and sequencing.
1. In Vivo Verification
1) Agarose Gel Electrophoresis
BBa_K4195156 was assembled into the vector pSB3K3 by standard BioBrick assembly. The constructed plasmids were transformed into E. coli BL21(DE3), then the positive transformants were selected by kanamycin and confirmed by colony PCR and sequencing.
Fig. 4 The result of colony PCR. Plasmid pSB3K3.
2) Double transformation
Plasmid BBa_K4195156_pSB3K3 and plasmid BBa_K4195179_pSB1C3 were transformed into E. coli BL21(DE3). The positive transformants were selected by kanamycin and chloramphenicol.
3) Absorbance measurement
Colonies harboring the correct plasmid were cultivated and induced. The expression behavior of AmpC is observed by measuring the absorbance in 490 nm as time progressed using microplate reader.
Fig. 5 In vivo behavior of pirA_g1α_B as time progressed.
Reference
1. L. Gambill et al., https://www.biorxiv.org/content/10.1101/2022.01.12.476080v1 (2022).
2. K. E. Boehle, C. S. Carrell, J. Caraway, C. S. Henry, Paper-Based Enzyme Competition Assay for Detecting Falsified β-Lactam Antibiotics. ACS Sens 3, 1299-1307 (2018).
3. J. N. Zadeh et al., NUPACK: Analysis and design of nucleic acid systems. J Comput Chem 32, 170-173 (2011).
Sequence and Features
- 10COMPATIBLE WITH RFC[10]
- 12INCOMPATIBLE WITH RFC[12]Illegal NheI site found at 409
- 21INCOMPATIBLE WITH RFC[21]Illegal BglII site found at 311
Illegal XhoI site found at 776 - 23COMPATIBLE WITH RFC[23]
- 25COMPATIBLE WITH RFC[25]
- 1000COMPATIBLE WITH RFC[1000]
None |