Price Information
| Cat No. | Plasmid Name | Availability | Buy one, get one free! (?) |
|---|---|---|---|
| V001709 | EJ2GFP-puro | In stock, instant shipping |
Two tubes of lyophilized plasmid will be delivered, each tube is about 5µg.
Basic Vector Information
EJ2-GFP is a chromosome-integrated, GFP-based reporter specifically designed to monitor alternative non-homologous end joining (alt-NHEJ) of chromosomal double-strand breaks (DSBs) in mammalian cells. Its structure includes an N-terminal tag fused to GFP, with the coding sequence disrupted by an I-SceI site (for inducing DSBs) and stop codons in all three reading frames—flanked by 8-nucleotide microhomology regions. When DSBs are repaired via alt-NHEJ, the microhomology mediates annealing, removing the stop codons and causing a 35-nt deletion to restore functional GFP expression (with a unique XCM1 restriction site in the main product). This reporter primarily detects alt-NHEJ events (≈85% of GFP+ products are the 35-nt deletion type), with minor non-specific repair products (smaller/larger deletions) accounting for only ~15%. It is widely used to study alt-NHEJ regulation (e.g., Ku inhibits, CtIP promotes this pathway) and its role in cancer, such as BRCA2-mutant tumor resistance to PARP inhibitors.
- Vector Name:
- EJ2GFP-puro
- Antibiotic Resistance:
- Ampicillin
- Length:
- 7643 bp
- Type:
- Mammalian Expression
- Replication origin:
- ori
- Selection Marker:
- Puromycin
- Promoter:
- CAG
- 5' Primer:
- ttcctacagctcctgggcaacg
- 3' Primer:
- ttttggcagagggaaaaaga
- Growth Strain(s):
- Stbl3
- Growth Temperature:
- 37℃
EJ2GFP-puro vector Map
Plasmid Protocol
1. Centrifuge at 5,000×g for 5 min.
2. Carefully open the tube and add 20 μl of sterile water to dissolve the DNA.
3. Close the tube and incubate for 10 minutes at room temperature.
4. Briefly vortex the tube and then do a quick spin to concentrate the liquid at the bottom. Speed is less than 5000×g.
5. Store the plasmid at -20 ℃.
6. The concentration of plasmid re-measurement sometimes differs from the nominal value, which may be due to the position of the lyophilized plasmid in the tube, the efficiency of the re-dissolution, the measurement bias, and adsorption on the wall of the tube, therefore, it is recommended to transform and extract the plasmid before using it
General Plasmid Transform Protocol
1. Take one 100μl of the competent cells and thaw it on ice for 10min, add 2μl of plasmid, then ice bath for 30min, then heat-shock it at 42℃ for 60s, do not stir, and then ice bath for 2min.
2. Add 900μl of LB liquid medium without antibiotics, and incubate at 37℃ for 45min (30℃ for 1-1.5 hours) with 180rpm shaking.
3. Centrifuge at 6000rpm for 5min, leave only 100μl of supernatant to resuspend the bacterial precipitate and spread it onto the target plasmid-resistant LB plate.
4. Invert the plate and incubate at 37℃ for 14h, or at 30℃ for 20h.
5. Pick a single colony into LB liquid medium, add the corresponding antibiotics, incubate at 220rpm for 14h, and extract the plasmid according to the experimental needs and the instructions of the plasmid extraction kit.
References
- Bennardo N, Cheng A, Huang N, Stark JM. Alternative-NHEJ is a mechanistically distinct pathway of mammalian chromosome break repair. PLoS Genet. 2008 Jun 27;4(6):e1000110.
EJ2GFP-puro vector Sequence
LOCUS Exported 7643 bp DNA circular SYN 19-NOV-2025
DEFINITION synthetic circular DNA.
ACCESSION .
VERSION .
KEYWORDS .
SOURCE synthetic DNA construct
ORGANISM synthetic DNA construct
REFERENCE 1 (bases 1 to 7643)
AUTHORS Bennardo N, Cheng A, Huang N, Stark JM
TITLE Alternative-NHEJ is a mechanistically distinct pathway of mammalian
chromosome break repair.
JOURNAL PLoS Genet. 2008 Jun 27;4(6):e1000110. doi:
10.1371/journal.pgen.1000110.
PUBMED 18584027
REFERENCE 2 (bases 1 to 7643)
TITLE Direct Submission
REFERENCE 3 (bases 1 to 7643)
TITLE Direct Submission
REFERENCE 4 (bases 1 to 7643)
AUTHORS .
TITLE Direct Submission
COMMENT SGRef: number: 1; type: "Journal Article"; journalName: "PLoS
Genet."; date: "2008-06-27"; pages: "
10.1371/journal.pgen.1000110"
COMMENT SGRef: number: 2; type: "Journal Article"
COMMENT SGRef: number: 3; type: "Journal Article"
FEATURES Location/Qualifiers
source 1..7643
/mol_type="other DNA"
/organism="synthetic DNA construct"
enhancer 1..380
/label=CMV enhancer
/note="human cytomegalovirus immediate early enhancer"
promoter 382..658
/label=chicken beta-actin promoter
intron 659..1675
/label=chimeric intron
/note="chimera between introns from chicken beta-actin and
rabbit beta-globin"
primer_bind 1683..1702
/label=pCAG-F
/note="Rabbit beta-globin intron, for pCAG plasmids,
forward primer"
CDS 1764..1784
/codon_start=1
/label=SV40 NLS
/note="nuclear localization signal of SV40 (simian virus
40) large T antigen"
/translation="PKKKRKV"
CDS 1806..1826
/codon_start=1
/label=SV40 NLS
/note="nuclear localization signal of SV40 (simian virus
40) large T antigen"
/translation="PKKKRKV"
CDS 2081..2797
/codon_start=1
/label=EGFP
/note="enhanced GFP"
/translation="MVSKGEELFTGVVPILVELDGDVNGHKFSVSGEGEGDATYGKLTL
KFICTTGKLPVPWPTLVTTLTYGVQCFSRYPDHMKQHDFFKSAMPEGYVQERTIFFKDD
GNYKTRAEVKFEGDTLVNRIELKGIDFKEDGNILGHKLEYNYNSHNVYIMADKQKNGIK
VNFKIRHNIEDGSVQLADHYQQNTPIGDGPVLLPDNHYLSTQSALSKDPNEKRDHMVLL
EFVTAAGITLGMDELYK"
primer_bind complement(3005..3024)
/label=Bglob-pA-R
/note="Rabbit beta-globin polyA region, reverse primer"
polyA_signal 3070..3125
/label=beta-globin poly(A) signal
/note="rabbit beta-globin polyadenylation signal (Gil and
Proudfoot, 1987)"
primer_bind complement(3124..3143)
/label=rbglobpA-R
/note="Rabbit beta-globin polyA, reverse primer. Also
called rb-glob-pA-term-R"
promoter complement(3483..3501)
/label=SP6 promoter
/note="promoter for bacteriophage SP6 RNA polymerase"
primer_bind complement(3582..3601)
/label=pRS-marker
/note="pRS vectors, use to sequence yeast selectable
marker"
primer_bind 3701..3723
/label=pGEX 3'
/note="pGEX vectors, reverse primer"
primer_bind complement(3761..3779)
/label=pBRforEco
/note="pBR322 vectors, upsteam of EcoRI site, forward
primer"
promoter 3847..3951
/label=AmpR promoter
CDS 3952..4809
/codon_start=1
/label=AmpR
/note="beta-lactamase"
/translation="MSIQHFRVALIPFFAAFCLPVFAHPETLVKVKDAEDQLGARVGYI
ELDLNSGKILESFRPEERFPMMSTFKVLLCGAVLSRIDAGQEQLGRRIHYSQNDLVEYS
PVTEKHLTDGMTVRELCSAAITMSDNTAANLLLTTIGGPKELTAFLHNMGDHVTRLDRW
EPELNEAIPNDERDTTMPVAMATTLRKLLTGELLTLASRQQLIDWMEADKVAGPLLRSA
LPAGWFIADKSGAGERGSRGIIAALGPDGKPSRIVVIYTTGSQATMDERNRQIAEIGAS
LIKHW"
rep_origin 4983..5571
/label=ori
/note="high-copy-number ColE1/pMB1/pBR322/pUC origin of
replication"
primer_bind 5725..5742
/label=L4440
/note="L4440 vector, forward primer"
promoter 5829..5847
/label=T7 promoter
/note="promoter for bacteriophage T7 RNA polymerase"
promoter 5885..6382
/label=PGK promoter
/note="mouse phosphoglycerate kinase 1 promoter"
CDS 6401..6997
/codon_start=1
/label=PuroR
/note="puromycin N-acetyltransferase"
/translation="MTEYKPTVRLATRDDVPRAVRTLAAAFADYPATRHTVDPDRHIER
VTELQELFLTRVGLDIGKVWVADDGAAVAVWTTPESVEAGAVFAEIGPRMAELSGSRLA
AQQQMEGLLAPHRPKEPAWFLATVGVSPDHQGKGLGSAVVLPGVEAAERAGVPAFLETS
APRNLPFYERLGFTVTADVEVPEGPRTWCMTRKPGA"
promoter 7641..7643
/label=CAG
/note="CMV early enhancer fused to modified chicken
beta-actin promoter"