Part:BBa_K942004:Experience

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Applications of BBa_K942004

Our shuttle sequence can be quite useful to other iGEM teams and anyone with the objective of producing or comparing the expression of proteins in two different expression systems. Coupled with an codon optimization for Pichia p. and a strain capable of reading rare codons like Rosetta Gami DE3 pLys, Bl21 star, the outcome can be a simultanious expression in both organisms coming from one single genetic sequence.

User Reviews

UNIQ3384b5279dba9b52-partinfo-00000000-QINU UNIQ3384b5279dba9b52-partinfo-00000001-QINU

This protein was expressed in Pichia pastoris. Thanks to its B.P.S. it was also planned to be expressed in Escherichia coli. We succesfully transformed the gene into our cloning strains, but curiously, our expression strains (DE3 strains) were not even able to be transformed, except from Rosettagami DE3 pLys. We believe that the fact that Rosettagami had pLys to prevent leak expression and the other expression strains did not, leads us to the idea that there might be posibility of Der f 2 having antibacterial effects, as it is describe on the main page of this same part.

We were able to se the expression of this protein on a SDS-PAGE after purifying it with a His-tag affinity column. Currently, we are trying different conditions to achieve the expression in BL21 Star.

This part uses a secretion signal for yeasts, and the protein produced was obtained by inducing Pichia Pastoris wih .5% methanol. The supernatant was obtained by centrifugation (10 ml at 3000 g, 5 min). After that, it was purified by the use of Maxi metal chelate spin clumns, from sartorius stedim biotech. Futhermore it was concentrated by using 3000 Dalton mwco ultracentrifuge filters. Obtaining a final concentration of .8 ug/ul in 500ul.

Tricine 16% gels were usedn order to see the protein by sds-page. Third lane = Derf (16KDa molecular weight) Fourth Lane = SeeBlue® Plus2 Pre-Stained