pmKate2-f-mem vector

cat.# FP186

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 pmKate2-f-mem FP186 20 μg € 400 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 mKate2 Reporter codon usage mammalian Promoter for mKate2 PCMV IE Host cells mammalian Selection prokaryotic - kanamycin eukaryotic - neomycin (G418) Replication prokaryotic - pUC ori eukaryotic - SV40 ori Use far-red fluorescent labeling of plasma membrane

Vector description

pmKate2-f-mem is a mammalian expression vector intended for far-red fluorescent labeling of plasma membrane in living cells. The vector encodes far-red fluorescent protein mKate2 (see reporter description) targeted to plasma membrane by 20 amino acid farnesylation signal from c-Ha-Ras [Aronheim et al., 1994; Hancock et al., 1991]. The farnesylation signal is fused to the mKate2 C-terminus.

Transiently transfected HeLa cells expressing mKate2 fusion with 20-amino acid farnesylation signal from c-Ha-Ras. Scale bar represents 10 μm. Image from Shcherbo et al., 2009.

mKate2 codon usage is optimized for high expression in mammalian cells, i.e. humanized [Haas et al., 1996]. To increase mRNA translation efficiency, Kozak consensus translation initiation site is generated upstream of mKate2-f-mem coding sequence [Kozak, 1987].

pmKate2-f-mem vector can be used as a source of mKate2-f-mem hybrid sequence. The vector backbone contains unique restriction sites that permit its excision and further insertion into expression vector of choice.

The vector backbone also 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.

Expression in mammalian cells

pmKate2-f-mem can be transfected into mammalian cells by any known transfection method. CMV promoter provides strong, constitutive expression of the mKate2-f-mem 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
mKate2
Start codon (ATG): 613-615
Last amino acid in mKate2: 1312-1314
Farnesylation signal: 1330-1389
Stop codon: 1390-1392
SV40 early mRNA polyadenylation signal
Polyadenylation signals: 1584-1589 & 1613-1618
mRNA 3' ends: 1622 & 1634
f1 single-strand DNA origin: 1681-2136
Bacterial promoter for expression of Kan^r gene
-35 region: 2198-2203
-10 region: 2221-2226
Transcription start point: 2233
SV40 origin of replication: 2477-2612
SV40 early promoter
Enhancer (72-bp tandem repeats): 2310-2381 & 2382-2453
21-bp repeats: 2457-2477, 2478-2498 & 2500-2520
Early promoter element: 2533-2539
Major transcription start points: 2529, 2567, 2573 & 2578
Kanamycin/neomycin resistance gene
Neomycin phosphotransferase coding sequences:
Start codon (ATG): 2661-2663
Stop codon: 3453-3455
G->A mutation to remove Pst I site: 2843
C->A (Arg to Ser) mutation to remove BssH II site: 3189
Herpes simplex virus (HSV) thymidine kinase (TK) polyadenylation signal
Polyadenylation signals: 3691-3696 & 3704-3709
pUC plasmid replication origin: 4040-4683