Generator

Part:BBa_J36850

Designed by: Perry Tsai   Group: iGEM06_Harvard   (2006-10-29)
Revision as of 17:45, 20 October 2009 by Dwhite (Talk | contribs) (Usage and Biology)

Lac-inducible generator of Lpp-OmpA(46-159)-Streptavidin wild-type + His6 tag

This device contains a lac promoter and strong ribosome binding site for lac-inducible expression of the fusion protein of Lpp signal peptide, OmpA aa46-159, and streptavidin wild-type + His6 tag. This expression should display streptavidin on the cell surface of E. coli.

NOTE ABOUT THE SEQUENCE: The mixed site between parts is 'only' six base pairs, ACTAGA. There is no spacer T or G nucleotide. These spacer nucleotides have been placed in the results for "get selected sequence" as an automatic composite-parts addition for the BioBricks mixed site between assembled parts. However, this does not apply for the two spacer nucleotides betweeon R0010 and B0034, and the one spacer nucleotide after B0034, because those were standard BioBricks.

Usage and Biology

Characterized by [http://2009.igem.org/Team:Washington Washington 2009 iGEM team]. We sought to use these parts for our protein secretion system. We used a western blot to confirm the expression of the proteins. Then we decided to test each part using flow cytometery. Using a biotinylated flourophore we hoped to visualize these cells by checking for increased florescence due to the binding interactions between the streptavadin and the biotin. Our results are described below in the histogram, the y-axis is the event frequency and the x-axis is the fluorescence intensity (FLA-1) of the cells/beads:


We also ran these cells under a microscope. We used the same streptavidin-coated beads (SVP-15-5 1.5-1.9 μm polystyrene spheres, [http://www.spherotech.com/coa_pol_par.htm Spherotech]) as a control. In this experiment we sought to see binding between the cells and the biotinylated flourophore. The results are summarized below.

  • Note: Images shown are not from cells 50, but these results were identical for all cells tested

Sequence and Features


Assembly Compatibility:
  • 10
    COMPATIBLE WITH RFC[10]
  • 12
    COMPATIBLE WITH RFC[12]
  • 21
    INCOMPATIBLE WITH RFC[21]
    Illegal BamHI site found at 711
  • 23
    COMPATIBLE WITH RFC[23]
  • 25
    INCOMPATIBLE WITH RFC[25]
    Illegal AgeI site found at 753
    Illegal AgeI site found at 804
  • 1000
    COMPATIBLE WITH RFC[1000]


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Categories
Parameters
None