Regulatory

Part:BBa_K2992015

Designed by: Yaseen Tengur   Group: iGEM19_Nottingham   (2019-09-12)
Revision as of 02:48, 22 October 2019 by JacobGausden (Talk | contribs) (→‎Usage and Biology)


5-UTR containing RBS for ntnH gene from C. botulinum

5’-UTR containing RBS for ntnH gene from C. botulinum


Usage and Biology

The native 5’-UTR containing the RBS is found naturally upstream of PntnH (BBa_K2992001) in C. botulinum. ntnH encodes the non-toxic non-haemagglutinin component of the botulinum neurotoxin complexes. Its expression is directly regulated by BotR (BBa_K2992002). In our project we use the regulatory region of ntnH to drive expression of our chosen reporter genes of interest. Doing so, allowed us to link BotR expression with the transcriptional activation of our reporter genes.

Characterisation

This basic part was used for the assembly of our composite parts and characterised using using 3 difference reporters: GusA (BBa_K2992039), FAST (BBa_K2992044) and acetone (BBa_K2992036 ). This part was used as a promoter which functions in both the Gram-negative E. coli and the Gram-positive Clostridium sporogenens. More information can be found on our Results Page.



T--Nottingham--Basic4.png
T--Nottingham--Basic3.png
Characterisation of this promoter against Pfdx, Pthl and PbotR using FAST fluorescent assay, showed Pntnh to be an effective promoter in E.coli and only slightly stronger than no promoter in C.sporogenes.
In the C. sporogenes experiments, adequate expression was detected for each of the clostridial promoters chosen for study. The two Pfdx derivatives generated the greatest level of reporter activity whilst the two C. botulinum promoters generated much lower levels of activity. Reporter activity appeared to be generally higher when analysed from the E. coli lysates as opposed to the C. sporogenes lysates. In those experiments, activity from the PbotR and Pntnh constructs were considerably greater than the no promoter control.




Sequence and Features


Assembly Compatibility:
  • 10
    COMPATIBLE WITH RFC[10]
  • 12
    COMPATIBLE WITH RFC[12]
  • 21
    COMPATIBLE WITH RFC[21]
  • 23
    COMPATIBLE WITH RFC[23]
  • 25
    COMPATIBLE WITH RFC[25]
  • 1000
    COMPATIBLE WITH RFC[1000]

References

Raffestin, S., Dupuy, B., Marvaud, J. and Popoff, M. (2004). BotR/A and TetR are alternative RNA polymerase sigma factors controlling the expression of the neurotoxin and associated protein genes in Clostridium botulinum type A and Clostridium tetani. Molecular Microbiology, 55(1), pp.235-249.


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