pEGFP-C3载体 货号6082-1

pEGFP-C3 vector

Map:

Description:

pEGFP-C3 encodes a red-shifted variant of wild-type GFP (1–3) which has been optimized for

brighter fluorescence and higher expression in mammalian cells. (Excitation maximum = 488 nm;

emission maximum = 507 nm.) pEGFP-C3 encodes the GFPmut1 variant (4) which contains the

double-amino-acid substitution of Phe-64 to Leu and Ser-65 to Thr. The coding sequence of the

EGFP gene contains more than 190 silent base changes which correspond to human codon-usage

preferences (5). Sequences flanking EGFP have been converted to a Kozak consensus translation

initiation site (6) to further increase the translation efficiency in eukaryotic cells. The MCS in

pEGFP-C3 is between the EGFP coding sequences and the SV40 poly A. Genes cloned into the

MCS will be expressed as fusions to the C terminus of EGFP if they are in the same reading frame

as EGFP and there are no intervening stop codons. SV40 polyadenylation signals downstream of

the EGFP gene direct proper processing of the 3' end of the EGFP mRNA. The vector backbone also

contains an SV40 origin for replication in mammalian cells expressing the SV40 T-antigen. A

neomycin resistance cassette (Neor), consisting of the SV40 early promoter, the neomycin/

kanamycin resistance gene of Tn5, and polyadenylation signals from the Herpes simplex virus

thymidine kinase (HSV TK) gene, allows stably transfected eukaryotic cells to be selected using

G418. A bacterial promoter upstream of this cassette expresses kanamycin resistance in E. coli. The

pEGFP-C3 backbone also provides a pUC origin of replication for propagation in E. coli and an f1

origin for single-stranded DNA production.

Use:

Fusions to the C terminus of EGFP retain the fluorescent properties of the native protein allowing the localization of

the fusion protein in vivo. The target gene should be cloned into pEGFP-C3 so that it is in frame with the EGFP coding

sequences, with no intervening in-frame stop codons. The recombinant EGFP vector can be transfected into

mammalian cells using any standard transfection method. If required, stable transformants can be selected using

G418 (7). pEGFP-C3 can also be used simply to express EGFP in a cell line of interest (e.g., as a transfection marker).

Location of Features:

• Human cytomegalovirus (CMV) immediate early promoter: 1–589

Enhancer region: 59–465; TATA box: 554–560

Transcription start point: 583

C→G mutation to remove Sac I site: 569

• Enhanced green fluorescent protein gene

Kozak consensus translation initiation site: 606–616

Start codon (ATG): 613–615; Stop codon: 1408–1410

Insertion of Val at position 2: 616–618

GFPmut1 chromophore mutations (Phe-64 to Leu; Ser-65 to Thr): 805–810

His-231 to Leu mutation (A→T): 1307

Last amino acid in wild-type GFP: 1327–1329

• MCS: 1328–1413

• SV40 early mRNA polyadenylation signal

Polyadenylation signals: 1546–1551 & 1575–1580; mRNA 3' ends: 1584 & 1596

• f1 single-strand DNA origin: 1643–2098 (Packages the noncoding strand of EGFP)

• Bacterial promoter for expression of Kanr gene

–35 region: 2160–2165; –10 region: 2183–2188

Transcription start point: 2195

• SV40 origin of replication: 2439–2574

• SV40 early promoter

Enhancer (72-bp tandem repeats): 2272–2343 & 2344–2415

21-bp repeats: 2419–2439, 2440–2460 & 2462–2482

Early promoter element: 2495–2501

Major transcription start points: 2491, 2529, 2535 & 2540

• Kanamycin/neomycin resistance gene

Neomycin phosphotransferase coding sequences:

Start codon (ATG): 2623–2625; stop codon: 3415–3417

G→A mutation to remove Pst I site: 2805

C→A (Arg to Ser) mutation to remove BssH II site: 3151

• Herpes simplex virus (HSV) thymidine kinase (TK) polyadenylation signal

Polyadenylation signals: 3653–3658 & 3666–3671

• pUC plasmid replication origin: 4002–4645

Primer Locations:

• EGFP-N Sequencing Primer (#6479-1): 679–658

• EGFP-C Sequencing Primer (#6478-1): 1266–1287

Propagation in E. coli:

• Suitable host strains: DH5α, HB101, and other general purpose strains. Single-stranded DNA production requires

a host containing an F plasmid such as JM109 or XL1-Blue.

• Selectable marker: plasmid confers resistance to kanamycin (30 μg/ml) to E. coli hosts.

• E. coli replication origin: pUC

• Copy number: ≈500

• Plasmid incompatibility group: pMB1/ColE1

References:

1. Prasher, D. C., et al. (1992) Gene 111:229–233.

2. Chalfie, M., et al. (1994) Science 263:802–805.

3. Inouye, S. & Tsuji, F. I. (1994) FEBS Letters 341:277–280.

4. Cormack, B., et al. (1996) Gene 173:33–38.

5. Haas, J., et al. (1996) Curr. Biol. 6:315–324.

6. Kozak, M. (1987) Nucleic Acids Res. 15:8125–8148.

7. Gorman, C. (1985) In DNA Cloning: A Practical Approach, Vol. II, Ed. Glover, D. M. (IRL Press, Oxford, UK) pp. 143–190.