Price Information
| Cat No. | Plasmid Name | Availability | Add to cart |
|---|---|---|---|
| V011005 | pET-28a(+) | In stock, instant shipping |
Buy one, get one free! |
Two tubes of lyophilized plasmid will be delivered, each tube is about 5µg.
Basic Vector Information
pET-28a(+) is a bacterial expression vector designed for the production of N-terminally 6xHis-tagged proteins with a thrombin cleavage site. This vector is particularly suitable for proteins that require post-translational processing to remove the His-tag.
- Vector Name:
- pET-28a(+)
- Antibiotic Resistance:
- Kanamycin
- Length:
- 5365 bp
- Type:
- pET & Duet Vectors (Novagen)
- Replication origin:
- ori
- Source/Author:
- Novagen (EMD Millipore)
- Copy Number:
- High copy number
- Growth Strain(s):
- DH10B
- Growth Temperature:
- 37℃
pET-28a(+) 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
- Shams MH, Sohrabi SM, Jafari R, et al. Designing a T-cell epitope-based vaccine using in silico approaches against the Sal k 1 allergen of Salsola kali plant. Sci Rep. 2024;14(1):5040. Published 2024 Feb 29. doi:10.1038/s41598-024-55788-x
pET-28a(+) vector Sequence
LOCUS Exported 5365 bp DNA circular SYN 01-JUN-2024
DEFINITION synthetic circular DNA
ACCESSION .
VERSION .
KEYWORDS .
SOURCE synthetic DNA construct
ORGANISM synthetic DNA construct
REFERENCE 1 (bases 1 to 5365)
AUTHORS 123455
TITLE Direct Submission
FEATURES Location/Qualifiers
source 1..5365
/mol_type="other DNA"
/organism="synthetic DNA construct"
rep_origin 12..467
/direction=RIGHT
/label=f1 ori
/note="f1 bacteriophage origin of replication; arrow
indicates direction of (+) strand synthesis"
CDS complement(559..1374)
/codon_start=1
/product="aminoglycoside phosphotransferase"
/label=KanR
/note="confers resistance to kanamycin in bacteria or G418
(Geneticin(R)) in eukaryotes"
/translation="MSHIQRETSCSRPRLNSNMDADLYGYKWARDNVGQSGATIYRLYG
KPDAPELFLKHGKGSVANDVTDEMVRLNWLTEFMPLPTIKHFIRTPDDAWLLTTAIPGK
TAFQVLEEYPDSGENIVDALAVFLRRLHSIPVCNCPFNSDRVFRLAQAQSRMNNGLVDA
SDFDDERNGWPVEQVWKEMHKLLPFSPDSVVTHGDFSLDNLIFDEGKLIGCIDVGRVGI
ADRYQDLAILWNCLGEFSPSLQKRLFQKYGIDNPDMNKLQFHLMLDEFF"
rep_origin 1496..2084
/direction=RIGHT
/label=ori
/note="high-copy-number ColE1/pMB1/pBR322/pUC origin of
replication"
misc_feature 2270..2409
/label=bom
/note="basis of mobility region from pBR322"
CDS complement(2511..2702)
/codon_start=1
/gene="rop"
/product="Rop protein, which maintains plasmids at low copy
number"
/label=rop
/translation="MTKQEKTALNMARFIRSQTLTLLEKLNELDADEQADICESLHDHA
DELYRSCLARFGDDGENL"
CDS complement(3511..4593)
/codon_start=1
/gene="lacI"
/product="lac repressor"
/label=lacI
/note="The lac repressor binds to the lac operator to
inhibit transcription in E. coli. This inhibition can be
relieved by adding lactose or
isopropyl-beta-D-thiogalactopyranoside (IPTG)."
/translation="MKPVTLYDVAEYAGVSYQTVSRVVNQASHVSAKTREKVEAAMAEL
NYIPNRVAQQLAGKQSLLIGVATSSLALHAPSQIVAAIKSRADQLGASVVVSMVERSGV
EACKAAVHNLLAQRVSGLIINYPLDDQDAIAVEAACTNVPALFLDVSDQTPINSIIFSH
EDGTRLGVEHLVALGHQQIALLAGPLSSVSARLRLAGWHKYLTRNQIQPIAEREGDWSA
MSGFQQTMQMLNEGIVPTAMLVANDQMALGAMRAITESGLRVGADISVVGYDDTEDSSC
YIPPLTTIKQDFRLLGQTSVDRLLQLSQGQAVKGNQLLPVSLVKRKTTLAPNTQTASPR
ALADSLMQLARQVSRLESGQ"
promoter complement(4594..4671)
/gene="lacI"
/label=lacI promoter
promoter 4980..4998
/label=T7 promoter
/note="promoter for bacteriophage T7 RNA polymerase"
protein_bind 4999..5023
/label=lac operator
/bound_moiety="lac repressor encoded by lacI"
/note="The lac repressor binds to the lac operator to
inhibit transcription in E. coli. This inhibition can be
relieved by adding lactose or
isopropyl-beta-D-thiogalactopyranoside (IPTG)."
RBS 5054..5059
/note="ribosome binding site"
CDS 5079..5096
/codon_start=1
/product="6xHis affinity tag"
/label=6xHis
/translation="HHHHHH"
CDS 5106..5123
/codon_start=1
/product="thrombin recognition and cleavage site"
/label=thrombin site
/translation="LVPRGS"
CDS 5127..5159
/codon_start=1
/product="leader peptide from bacteriophage T7 gene 10"
/label=T7 tag (gene 10 leader)
/note="promotes efficient translation in E. coli"
/translation="MASMTGGQQMG"
misc_feature 5163..5208
/label=MCS
CDS 5209..5226
/codon_start=1
/product="6xHis affinity tag"
/label=6xHis
/translation="HHHHHH"
terminator 5293..5340
/label=T7 terminator
/note="transcription terminator for bacteriophage T7 RNA
polymerase"