PhiC31 Reporter attP:T35S:attB:omegaUTR
PhiC31 is a site-specific serine recombinase derived from a Streptomyces phage . The enzyme recognizes two different attachments sites called also attB and attP, and also excise a sequence flanked with attB and attP sites close to the promoter.
Biology and Usage
In order to see the activity of the integrase, Valencia_UPV 2015 designed the present reporter element (BBa_K1742008) that consists of a Cauliflower Mosaic Virus terminator (T35S) flanked with the recognition sites (attP:T35S:attB:omegaUTR) of PhiC31. The CDS was subsequently assembled in a multipartite reaction with the P35S promoter with no ATG, the GFP coding sequence and the T35S terminator. The plant codon-optimized PhiC31 (BBa_K1742004) gene was domesticated and standardized as a GoldenBraid part and cloned into the pUPD2 entry vector. The PhiC31 integrase gene was then assembled in a multipartite reaction with the strong promoter from the Cauliflower Mosaic Virus (P35S), and its terminator (T35S). With a binary GoldenBraid assembly step we obtained a multigenic construct (BBa_K1742013) of the previously described transcriptional units. This construct was then transformed, by agroinfiltration, into N. benthamiana plants for testing the expression of GFP.
Figure 1. Expression levels of GFP in N. benthamiana leaves. A) Agrobacterium-mediated transformation with the multigenic construct (BBa_K1742013). B) Plant leaf transformed with the PhiC31 reporter element assembled with the P35S promoter without ATG, GFP coding sequence and the terminator T35S.
1. Keravala, A., Groth, AC., Jarrahian, S., Thyagarajan, B., Hoyt, JJ., Kirby, PJ., and Calos, MP. (2006). A diversity of serine phage integrases mediate site-specific recombination in mammalian cells. Molecular Genetics and Genomics, 276(2), 135–146
Sequence and Features
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