pKatushka2S-C vector

cat.# FP761

The vector sequence has been compiled using the information from sequence databases, published literature, and other sources, together with partial sequences obtained by Evrogen. This vector has not been completely sequenced.

Download vector information: Data sheet (pdf) Sequence (txt) Restriction map (pdf) Restriction table (pdf)

Product Cat.# Size Price pKatushka2S-C FP761 20 μg € 480 / 240* *50% discount on the second and subsequent vectors encoding same fluorescent protein or sensor ordered by the same customer. The price does not include delivery. The price varies in different countries. Please contact your local distributor for exact prices and delivery information. Vector type mammalian expression vector Reporter Katushka2S Reporter codon usage mammalian Promoter for Katushka2S PCMV IE Host cells mammalian Selection prokaryotic – kanamycin eukaryotic – neomycin (G418) Replication prokaryotic – pUC ori eukaryotic – SV40 ori Use Katushka2S expression in mammalian cells; generation of fusions to the Katushka2S C-terminus

Vector description

pKatushka2S-C is a mammalian expression vector encoding far-red fluorescent protein Katushka2S (see reporter description). The vector allows generation of fusions to the Katushka2S C-terminus and expression of Katushka2S fusions or Katushka2S alone in eukaryotic (mammalian) cells.

Katushka2S codon usage is optimized for high expression in mammalian cells (humanized) [Haas et al., 1996]. To increase mRNA translation efficiency, Kozak consensus translation initiation site is generated upstream of the Katushka2S coding sequence [Kozak, 1987]. Multiple cloning site (MCS) is located between Katushka2S coding sequence and SV40 polyadenylation signal (SV40 polyA).

The vector backbone contains immediate early promoter of cytomegalovirus (P_{CMV IE}) for protein expression, SV40 origin for replication in mammalian cells expressing SV40 T-antigen, pUC origin of replication for propagation in E. coli, and f1 origin for single-stranded DNA production. SV40 polyadenylation signals (SV40 poly A) direct proper processing of the 3'-end of the reporter mRNA.

SV40 early promoter (P_SV40) provides neomycin resistance gene (Neo^r) expression to select stably transfected eukaryotic cells using G418. Bacterial promoter (P) provides kanamycin resistance gene expression (Kan^r) in E. coli. Kan^r/Neo^r gene is linked with herpes simplex virus (HSV) thymidine kinase (TK) polyadenylation signals.

Generation of Katushka2S fusion proteins

A localization signal or a gene of interest can be cloned into MCS of the vector. It will be expressed as a fusion to the Katushka2S C-terminus when inserted in the same reading frame as Katushka2S and no in-frame stop codons are present. Katushka2S-tagged fusions retain fluorescent properties of the native protein allowing fusion localization in vivo. Unmodified vector will express Katushka2S when transfected into eukaryotic (mammalian) cells.

Expression in mammalian cells

pKatushka2S-C vector can be transfected into mammalian cells by any known transfection method. CMV promoter provides strong, constitutive expression of Katushka2S or its fusions in eukaryotic cells. If required, stable transformants can be selected using G418 [Gorman, 1985].

Propagation in E. coli

Suitable host strains for propagation in E. coli include DH5alpha, HB101, XL1-Blue, and other general purpose strains. Plasmid incompatibility group is pMB1/ColE1. The vector confers resistance to kanamycin (30 μg/ml) to E. coli hosts. Copy number in E. coli is about 500.

Location of features

P_{CMV IE}: 1-589
Enhancer region: 59-465
TATA box: 554-560
Transcription start point: 583
Kozak consensus translation initiation site: 606-616
Katushka2S
Start codon (ATG): 613-615
Stop codon: 1396-1398
Last amino acid in Katushka2S: 1315-1317
MCS: 1318-1398
SV40 early mRNA polyadenylation signal
Polyadenylation signals: 1538-1543 & 1567-1572
mRNA 3' ends: 1576 & 1588
f1 single-strand DNA origin: 1635-2090
Bacterial promoter for expression of Kan^r gene
-35 region: 2152-2157
-10 region: 2175-2180
Transcription start point: 2187
SV40 origin of replication: 2431-2566
SV40 early promoter
Enhancer (72-bp tandem repeats): 2264-2335 & 2336-2407
21-bp repeats: 2411-2431, 2432-2452 & 2454-2474
Early promoter element: 2487-2493
Major transcription start points: 2483, 2521, 2527 & 2532
Kanamycin/neomycin resistance gene
Neomycin phosphotransferase coding sequences:
Start codon (ATG): 2615-2617
Stop codon: 3407-3409
G->A mutation to remove Pst I site: 2797
C->A (Arg to Ser) mutation to remove BssH II site: 3143
Herpes simplex virus (HSV) thymidine kinase (TK) polyadenylation signal
Polyadenylation signals: 3645-3650 & 3658-3663
pUC plasmid replication origin: 3994-4637