Difference between revisions of "Part:BBa K174003"
 
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This device is a tunable, heritable, stochastic switch for ''Bacillus subtilis''. Essentially it encodes a heads or tails device that can be biased using two inducible promoters and by controlling the rate of degradation of the protein responsible for the switching, Hin invertase.  
 
This device is a tunable, heritable, stochastic switch for ''Bacillus subtilis''. Essentially it encodes a heads or tails device that can be biased using two inducible promoters and by controlling the rate of degradation of the protein responsible for the switching, Hin invertase.  
  
−
It can be tuned to control cell differention and fate in a stochatic manner.
+
It can be tuned to control cell differention and fate in a stochastic manner.
  
−
As an indication of the decision, either Rfp on the left side of the switch or the downstream genes on the right side of the switch is expressed.  
+
The part employs Hin invertase to invert a middle segment flanked by ''hix'' sites.
  
−
An invertible region including a ''sigA'' promoter and the ''hin'' CDS is inverted by Hin [1,2,3]. The expression of Hin can be controlled by IPTG and Xylose using the pSpac or pXyl promoters that flank the ''hin'' gene, depending on the orientation of the middle segment [5,6].  
+
Theinvertible region included an outward facing ''sigA'' promoter and the ''hin'' CDS [1,2,3]. The expression of Hin can be controlled by IPTG and Xylose using the pSpac or pXyl promoters that flank the invertable segment, and either of which can be used to drive the transcription of ''hin'' depending on the orientation of the middle segment [5,6].
 +
 
 +
As an indication of the segment orientation, either ''rfp'' on the left side of the switch or additional genes on the right side of the switch are expressed by the sigA promoter on the segment.  
  
 
As a third level control, the modified version of ''ssrA'' tag has been translationally fused to the C-terminus of the Hin protein, so that it can be selectively degraded (See [[Part:BBa_K174002]] for arabinose controlled SspB adaptor protein for the degradation).
 
As a third level control, the modified version of ''ssrA'' tag has been translationally fused to the C-terminus of the Hin protein, so that it can be selectively degraded (See [[Part:BBa_K174002]] for arabinose controlled SspB adaptor protein for the degradation).
  
−
When this part is used in combination [[Part:BBa_K174002]] expression of ''hin'', hence the rate of switching of the orientiation of the invertible region is affected by the concentration of IPTG, Xylose, Arabinose.
+
When this part is used in combination [[Part:BBa_K174002]] expression of ''hin'', hence the rate of switching of the orientiation of the invertible region is controlled by the concentration of IPTG, Xylose, Arabinose.
  
 
Downstream genes on the left and right sides of the switch can be used to trigger cell fate decisions.
 
Downstream genes on the left and right sides of the switch can be used to trigger cell fate decisions.
  
−
In our iGEM 2009 project, our switch was cloned into pGFP-rrnB[4] integration vector on NheI site and ended up with Gfp on the right side. However it was sent to the registry in pSB1AT3 since the pGFP-rrnB is not a Biobrick compatible vector.
+
In our iGEM 2009 project, our switch was cloned into pGFP-rrnB [4] integration vector at the NheI site introducing ''gfp'' on the right side. However it was sent to the registry in pSB1AT3 since the pGFP-rrnB is not a Biobrick compatible vector.
  
 
For more information about this part go to Newcastle iGEM2009 [http://2009.igem.org/Team:Newcastle/Stochasticity Stochasticity] and [http://2009.igem.org/Team:Newcastle/Modelling Modelling] pages.
 
For more information about this part go to Newcastle iGEM2009 [http://2009.igem.org/Team:Newcastle/Stochasticity Stochasticity] and [http://2009.igem.org/Team:Newcastle/Modelling Modelling] pages.

Latest revision as of 22:10, 21 October 2009

Heritable, Tunable, Stochastic Switch

This device is a tunable, heritable, stochastic switch for Bacillus subtilis. Essentially it encodes a heads or tails device that can be biased using two inducible promoters and by controlling the rate of degradation of the protein responsible for the switching, Hin invertase.

It can be tuned to control cell differention and fate in a stochastic manner.

The part employs Hin invertase to invert a middle segment flanked by hix sites.

Theinvertible region included an outward facing sigA promoter and the hin CDS [1,2,3]. The expression of Hin can be controlled by IPTG and Xylose using the pSpac or pXyl promoters that flank the invertable segment, and either of which can be used to drive the transcription of hin depending on the orientation of the middle segment [5,6].

As an indication of the segment orientation, either rfp on the left side of the switch or additional genes on the right side of the switch are expressed by the sigA promoter on the segment.

As a third level control, the modified version of ssrA tag has been translationally fused to the C-terminus of the Hin protein, so that it can be selectively degraded (See Part:BBa_K174002 for arabinose controlled SspB adaptor protein for the degradation).

When this part is used in combination Part:BBa_K174002 expression of hin, hence the rate of switching of the orientiation of the invertible region is controlled by the concentration of IPTG, Xylose, Arabinose.

Downstream genes on the left and right sides of the switch can be used to trigger cell fate decisions.

In our iGEM 2009 project, our switch was cloned into pGFP-rrnB [4] integration vector at the NheI site introducing gfp on the right side. However it was sent to the registry in pSB1AT3 since the pGFP-rrnB is not a Biobrick compatible vector.

For more information about this part go to Newcastle iGEM2009 [http://2009.igem.org/Team:Newcastle/Stochasticity Stochasticity] and [http://2009.igem.org/Team:Newcastle/Modelling Modelling] pages.



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
    INCOMPATIBLE WITH RFC[25]
    Illegal NgoMIV site found at 1791
    Illegal AgeI site found at 105
    Illegal AgeI site found at 217
  • 1000
    COMPATIBLE WITH RFC[1000]


References

  1. Ham, T.S., et al., Design and Construction of a Double Inversion Recombination Switch for Heritable Sequential Genetic Memory. PLoS ONE, 2008. 3(7): p. e2815.
  2. Haynes, K., M. Broderick, et al. (2008). "Engineering bacteria to solve the Burnt Pancake Problem." Journal of Biological Engineering 2(1): 8.
  3. Kutsukake, K., et al., Two DNA Invertases Contribute to Flagellar Phase Variation in Salmonella enterica Serovar Typhimurium Strain LT2. J. Bacteriol., 2006. 188(3): p. 950-957.
  4. Veening, J.-W., H. Murray, and J. Errington, A mechanism for cell cycle regulation of sporulation initiation in Bacillus subtilis. Genes & Development, 2009. 23(16): p. 1959-1970.
  5. Kim, L., A. Mogk, et al. (1996). "A xylose-inducible Bacillus subtilis integration vector and its application." Gene 181: 71-76.
  6. Kreuzer, P., D. Gartner, et al. (1989). "Identification and sequence analysis of the Bacillus subtilis W23 xylR gene and xyl operator." J. Bacteriol. 171(7): 3840-3845.