pTagBFP-tubulin

pTagBFP-tubulin vector

cat.# FP175

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.


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pTagBFP-tubulinFP17520 μg€ 400 / 200*
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Vector typemammalian expression vector
ReporterTagBFP
Reporter codon usagemammalian
Promoter for TagBFPPCMV IE
Host cellsmammalian
Selectionprokaryotic – kanamycin
eukaryotic – neomycin (G418)
Replicationprokaryotic – pUC ori
eukaryotic – SV40 ori
Use blue fluorescent labeling of α-tubulin filaments

Vector description

pTagBFP-tubulin is a mammalian expression vector encoding TagBFP-tubulin fusion protein (see reporter description). The vector can be used for fluorescent labeling of α-tubulin in living cells.

Transiently transfected HeLa cells expressing TagBFP-tagged α-tubulin.

TagBFP codon usage is optimized for high expression in mammalian cells (humanized) [Haas et al., 1996]. Human α-tubulin is fused to the TagBFP C-terminus. To increase mRNA translation efficiency, Kozak consensus translation initiation site is generated upstream of the TagBFP-tubulin coding sequence [Kozak, 1987].

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

Note: The plasmid DNA was isolated from dam+-methylated E. coli. Therefore some restriction sites are blocked by methylation. If you wish to digest the vector using such sites you will need to transform the vector into a dam- host and make fresh DNA.

The vector backbone contains immediate early promoter of cytomegalovirus (PCMV 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 (PSV40) provides neomycin resistance gene (Neor) expression to select stably transfected eukaryotic cells using G418. Bacterial promoter (P) provides kanamycin resistance gene expression (Kanr) in E. coli. Kanr/Neor gene is linked with herpes simplex virus (HSV) thymidine kinase (TK) polyadenylation signals.


Expression in mammalian cells

pTagBFP-tubulin vector can be transfected into mammalian cells by any known transfection method. CMV promoter provides strong, constitutive expression of the TagBFP-tubulin fusion 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

PCMV IE: 1-589
Enhancer region: 59-465
TATA box: 554-560
Transcription start point: 583
TagBFP
Kozak consensus translation initiation site: 600-610
Start codon (ATG): 607-609
Stop codon: 2677-2679
Last amino acid in TagRFP: 1303-1305
Tubulin: 1324-2679
SV40 early mRNA polyadenylation signal
Polyadenylation signals: 2840-2845 & 2869-2874
mRNA 3' ends: 2878 & 2890
f1 single-strand DNA origin: 2937-3392
Bacterial promoter for expression of Kanr gene
-35 region: 3454-3459
-10 region: 3477-3482
Transcription start point: 3489
SV40 origin of replication: 3733-3868
SV40 early promoter
Enhancer (72-bp tandem repeats): 3566-3637 & 3638-3709
21-bp repeats: 3713-3733, 3734-3754 & 3756-3776
Early promoter element: 3789-3795
Major transcription start points: 3785, 3823, 3829 & 3834
Kanamycin/neomycin resistance gene
Neomycin phosphotransferase coding sequences:
Start codon (ATG): 3917-3919
Stop codon: 4709-4711
G->A mutation to remove Pst I site: 4099
C->A (Arg to Ser) mutation to remove BssH II site: 4445
Herpes simplex virus (HSV) thymidine kinase (TK) polyadenylation signal
Polyadenylation signals: 4947-4952 & 4960-4965
pUC plasmid replication origin: 5296-5939


References:

  • Gorman C. High efficiency gene transfer into mammalian cells. In DNA cloning: A Practical Approach, Vol. II. Ed. D. M. Glover. (IRL Press, Oxford, U.K.). 1985; 143-90.
  • Haas J, Park EC, Seed B. Codon usage limitation in the expression of HIV-1 envelope glycoprotein. Curr Biol. 1996; 6 (3):315-24. / pmid: 8805248
  • Kozak M. An analysis of 5'-noncoding sequences from 699 vertebrate messenger RNAs. Nucleic Acids Res. 1987; 15 (20):8125-48. / pmid: 3313277

Notice to Purchaser:

TagBFP-related materials (also referred to as "Products") are intended for research use only. The Products are covered by European Pat. 1994149 and other Evrogen Patents and/or Patent applications pending. By use of these Products, you accept the terms and conditions of the applicable Limited Use Label License.

The CMV promoter is covered under U.S. Patents 5,168,062 and 5,385,839, and its use is permitted for research purposes only. Any other use of the CMV promoter requires a license from the University of Iowa Research Foundation, 214 Technology Innovation Center, Iowa City, IA 52242.

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