Part:BBa_K4361016
BlcR-binding oligo, 91 bp, IR1 + IR2 + IR1 + IR2
BlcR is a transcription factor originating from the bacterium Agrobacterium tumefaciens (Part:BBa_K4361100). In a homodimer state it contains a single DNA-binding domain that specifically binds one of two DNA sequences. Both sequences are so-called inverted repeat pairs (IRs), short DNA sequences whose ends are reverse complements of each other. For the Blc operator, these sequences are 'ACTCTAATgATTCAAGT' (IR1) and 'ATTAGttgaactCTAAT' (IR2), as further explained in Part:BBa_K4361001.
To our understanding, one BlcR dimer contains two domains that allow for tetramerization, only one of which is used during tetramerization in vivo. Part:BBa_K4361015, this part, and Part:BBa_K4361018 have been designed to show whether or not BlcR dimers are able to form multimers larger than tetramers when bound to DNA. To create this part, the original 3 nt linker sequence (tca), a copy of IR1, tca, and a copy of IR2 have been added to the 3' end of the original IR2. The BlcR-binding domain of this part thus consists of IR1-tca-IR2-tca-IR1-tca-IR2. As the distance between the centers of all IRs is still 20 nt, see also Usage and Biology below, this oligo theoretically allows for the correct orientation of four sequential BlcR dimers to bind to each other, resulting in a BlcR octamer.
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]
Usage and Biology
The blc operator contains 2 pairs of inverted repeats, linked together by a 3 nt spacer, and each pair is assumed to bind one BlcR dimer (see Part:BBa_K4361100). With a spacer of specifically 3 nt, the centers of each pair are exactly 20 nt apart, which supports the hypothesis that the two dimers orient themselves at the same rotation angle to the DNA to form a tetramer. If the spacer were of a different length, the dimers would have different orientations to each other, possibly inhibiting tetramerization (see Part:BBa_K4361014). With two BlcR dimers bound and forming a tetramer, RNA polymerases originating from an upstream promoter are hindered from transcribing past the blc operator, inhibiting expression of downstream blcABC genes. Each BlcR monomer contains a binding site that is specific to gamma-butyrolactone (GBL) gamma-hydroxybutyric acid (GHB) and succinic semialdehyde (SSA). When a BlcR tetramer binds GHB with one of its binding sites, tetramerization is inhibited and BlcR becomes dissociated from the DNA, enabling downstream transcription and subsequent digestion of the newly present substrate (see Figure 1).
In our project, these oligos are used to tether BlcR to the surface of a gold electrode, of which we measure the capacitance. When BlcR molecules dissociate from the DNA in response to the binding of GHB, water molecules are displaced towards the surface of the electrode, which causes an increase in capacitance. This is the signal we interpret to indicate the presence of GHB.
Oligo variants
The wildtype blc operator has been theorized to not bind BlcR optimally, since BlcR regulates its own expression and that of proteins involved in the breakdown of GHB-like molecules. This means BlcR has to quickly unbind if these molecules taken up by A. tumefaciens, such that the bacterium can digest the molecules for nutrients. In our system, however, we would like BlcR to be more stably bound to DNA, such that it will only unbind in the presence of high GHB concentrations. This can be accomplished through two approaches: adjusting BlcR itself (see Part:BBa_K4361200 through Part:BBa_K4361227 and Part:BBa_K4361300 through Part:BBa_K4361319), or changing the DNA molecule it binds to. This set of Parts, ranging from Part:BBa_K4361000 up to Part:BBa_K4361022, shows our work on the second approach.
Results
As described in the Results section of Part:BBa_K4361000 and Part:BBa_K4361001, an electrophoresis experiment was performed with the majority of our designed oligos, wherein the aforementioned parts act respectively as the negative and positive control. By incubating them with BlcR and running them on a gel, the binding strength of BlcR to each sequence can be estimated by looking at the bands of free DNA and DNA bound by the protein. As can be seen in Figure 2, less DNA is bound by BlcR than with the wildtype sequence. This suggests a lower binding affinity between BlcR and DNA, so this oligo was not selected for further analysis.
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