Part:BBa_K2243019
Bxb1 attB_322R_Bxb1 attP
To test the influence of Bxb1 attB/P to terminator L3S3P22 (abbreviation: 322) in the reverse direction.
Usage and Biology
Usage
We constructed this part to characterize the recombination efficiency of the recombinase Bxb1 gp35 (BBa_K2243012). It consists of the terminator L3S3P22 (abbreviation: 322) in the reverse direction flanked by attB and attP sites of recombinase Bxb1 gp35. Upon recombination, the orientation of the terminator changes. As a result, expression of downstream sequence is initiated, and upstream sequence is transcribed.
Biology
The attP site of Mycobacteriophage Bxb1 is used to integrate phage DNA at the host attB site of Mycobacterium smegmatis, generating the recombinant junctions attL and attR. DNA cleavage and re-ligation occur at the central crossover region at attB and attP, which allows the sequence to be flipped, excised, or inserted between recognition sites. We obtained the terminator, attB and attP sites by oligo synthesis.
Characterization
We first characterized the terminator strength using the following formula:
Ts=〖GFP〗of the random sequence/〖[GFP]〗with the terminator
And we sifted out 6 desirable unidirectional terminators without potential cryptic promotor in both orientations.
Terminator Reference Table
Sequence and Features
- 10COMPATIBLE WITH RFC[10]
- 12COMPATIBLE WITH RFC[12]
- 21COMPATIBLE WITH RFC[21]
- 23COMPATIBLE WITH RFC[23]
- 25INCOMPATIBLE WITH RFC[25]Illegal NgoMIV site found at 4
- 1000INCOMPATIBLE WITH RFC[1000]Illegal BsaI site found at 24
Illegal BsaI.rc site found at 64
Illegal BsaI.rc site found at 147
direction | Reverse |
efficiency | |
function | Switch on |
origin |