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Part:BBa_K215002

Designed by: Jeff Nivala   Group: iGEM09_Washington   (2009-09-30)
Revision as of 23:19, 18 October 2009 by Swanson (Talk | contribs) (Usage and Biology)

pLac+RBS+Secretion Signal and Streptavidin Binding Tags

K215002 drives the expression of BBa_K215001 by placing it under the control of a strong, IPTG-inducible promoter (R0011) and RBS (R0034). Any favorite protein (afp) can be inserted into a composite tag BBa_K215001. The composite tag has an NheI site (compatible with XbaI and SpeI, but make sure the resulting product stays in frame, described below) which places the afp in between a series of tags which can be used with the [http://2009.igem.org/Team:Washington University of Washington 2009 Ideal Protein Purification system (IPP)]. The series of tags are, respectively: a Nano-Tag (binds to streptavidin), a 6x His tag (for IMAC purification), a TEV cute site (for removal of N-terminal tags), the NheI site (insertion of afp), TEV, 6x His tag, and the 181 C-terminal amino acids of prtB (secretion tag recognized by the secretion system: BBa_K215107). In order for the secretion tag to signal the secretion of afp the BioBrick BBa_K215107 must be present as well.

Cutting a BioBrick coding sequence at X and S and pasting into the NheI site of this construct would result in a stop codon at the resulting scar site. Therefore, to insert a gene into the K215001 of this construct, a PCR product must be generated that keeps the gene of interest in frame with the rest of the sequence. To do this:

  1. Design a primer that complements the coding sequence of interest starting at the second amino acid and includes the entire coding sequence except for the stop codon.
    1. Forward Primer: <8 random bp's> - <NheI or XbaI or SpeI> - <15-21bp complementing your gene of interest, starting at the second codon>
    2. Reverse Primer: <15-21bp complementing your gene of interest, ending BEFORE the stop codon (make sure it is a muliple of three to stay in frame)> - <NheI or XbaI or SpeI> - <8 random bp's>
  1. Amplify the gene of interest
  2. Clone into the NheI site of this construct.
  3. Screen colonies with either the Forward Primer+VR or the VF2+Reverse primer for inserts in the appropriate direction.
  4. Your fusion protein is tagged and ready for secretion and streptavidin binding!

Usage and Biology

To demonstrate the functionality of this construct, E0040 (GFP) was amplified as described above and inserted into the NheI site of BBa_K215002 and tested for expression. The constructs were then grown in BL21(lacIq) in the presence or absence of 0.5mM IPTG overnight at 298K. The two graphs below show the relative fluorescence of the two constructs as either a whole cell lysate, or a purfied soluble protein as a function of concentration.

Sequence and Features


Assembly Compatibility:
  • 10
    COMPATIBLE WITH RFC[10]
  • 12
    INCOMPATIBLE WITH RFC[12]
    Illegal NheI site found at 196
  • 21
    COMPATIBLE WITH RFC[21]
  • 23
    COMPATIBLE WITH RFC[23]
  • 25
    COMPATIBLE WITH RFC[25]
  • 1000
    COMPATIBLE WITH RFC[1000]


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n/apLac+RBS+Secretion Signal and Streptavidin Binding Tags