The aim of this study was to further characterise and improve the efficiency of the 2A coexpression system by introducing various mutations immediately upstream of shorter versions of F2A and T2A linking GFP and CherryFP proteins.
To generate the mCherry version, the upstream promoter region of mbtB was amplified using primers pHIC-6 F (CCC TCT AGA GCC GTT TGG CAG CTG GAG CAG) and pHIC-6 R (CCC GGA TCC GCC GTG CTC GGA CAT TCG C) and cloned as BamHI/XbaI fragment into pCHERRY1, replacing Phsp60, to generate pHIC-6.
A GCN4-lacZ reporter was employed with a modified version of upstream ORF1 that is elongated to overlap the GCN4 ORF (el.uORF1).uORF1
Recently, Tan and colleagues [ 31] successfully used a similar strategy by providing a spacer in the form of 3xFlag tag repeats (incorporated for other purposes) upstream of an 18aa version of F2A to express double or triple copies of the rabies virus glycoprotein from a single ORF in human adenovirus 5 (linked via F2As and followed by hrGFP as a marker after IRES).
Moreover, putative TPP riboswitches are located upstream of two similar versions of an operon containing taurine ABC transporter genes tauB and tauC.
Subtraction of a weighted version of the upstream image from the down-stream image permits alteration of the appearance of the VC image, from the extremes of stimulated-unequalized to highly equalized.
Activated ERK was obtained by coexpressing and immunoprecipitating HA-ERK with a constitutively active (R4F) version of its upstream kinase MKK1, whereas HA-ERK expressed with a kinase-dead (K97M) version of MKK1 or without any MKK1 yielded inactive ERK.
A version of the upstream sequence in which the "in register uORFs" had been removed also was produced based on sequential AUGs, where the AUG start codon was changed to UUG (see Figure 3 for an explanation).
To avoid using longer 2A sequences (which remain attached at the C-terminus of the upstream protein), researchers used shorter versions of F2A.
10 Kb upstream sequences (5' of TSS) of all Human (version GrCh37) and Mouse (version NCBIM37) protein-coding genes were retrieved using the Biomart utility provided by Ensembl web server (http://www.ensembl.org/biomart/martview).org/biomart/martview
A geometrically conservative one-dimensional (1D) arbitrary Lagrangian– Eulerian (ALE) version of the advective upstream splitting method (AUSM) shock capturing scheme is presented.
