Signalling

Part:BBa_K1800001

Designed by: Laura Lee Irvin   Group: iGEM15_Georgia_State   (2015-08-28)
Revision as of 20:30, 23 October 2017 by Pzanoni (Talk | contribs) (→‎Team INSA-UPS France 2017: usage of BBa_K1800001 in Pichia pastoris strain to secrete antimicrobial peptides)

Alpha-Factor Secretion Signal

The factor secretion signal is a N-terminal secretion signal from S. cerevisiae alpha factor intended to be used to create fusion proteins

Sequence and Features


Assembly Compatibility:
  • 10
    COMPATIBLE WITH RFC[10]
  • 12
    COMPATIBLE WITH RFC[12]
  • 21
    INCOMPATIBLE WITH RFC[21]
    Illegal XhoI site found at 244
  • 23
    COMPATIBLE WITH RFC[23]
  • 25
    COMPATIBLE WITH RFC[25]
  • 1000
    COMPATIBLE WITH RFC[1000]



Team INSA-UPS France 2017: usage of BBa_K1800001 in Pichia pastoris strain to secrete antimicrobial peptides

We fusionnate the alpha secretion factor with an antimicrobial peptide (AMP). The construction was put under the control of a pGAP promoter.

The construction was cloned in pPICZalpha vector and has been integrated in Pichia pastoris thanks to pGAP genomic homology region.

The functionality of the signal factor was investigated by demonstrating that AMP are present in the supernatant through a toxicity assay. The engineered yeast was used in a halo assay against V. harveyi as the target of AMPs. A paper soacked with a yeast supernantant solution was placed on the plate and V. harveyi growth in the viscinity of the yeast patch was followed:

AMP halo assay Positive control was performed with chloramphenicol (25 g/L), the negative control was performed with the empty plasmid integrated in P. pastoris, the assay was performed using the plasmid containing BBa_K2278021 driving D-NY15 secretion integrated in P. pastoris.

We can observe a significant inhibition halo meaning that the AMP have been secreted thanks to the alpha factor.

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