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Neomycin/G418/Geneticin Selection Plasmids

OG22 - pSF-CMV-Ub-Neo/G418 Ascl


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This plasmid is compatible with all of the other DNA sequences available on this site, which are all sold in the same backbone. This flexibility allows you to create any vector you require, with a variety of functions, simply by compiling the relevant sections from our product range.

Vector: pSF-CMV-Ub Neo/G418 AscI

Product Code: 

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Size (bp): 

Bacterial Antibiotic Selection:

Origin and Compatibility: 
pUC high copy, derived from pBR322   

Copy Number:
 500-700 copies per cell

Promoter: Cytomegalovirus (CMV) immediate early promoter and the Human Ubiquitin promoter


Purpose: This vector contains a Neomycin (Neo)/G418 resistance expression cassette under control of the Ubiquitin (Ub) promoter that is designed as an add-on to any of our vectors. The entire Ub Neo/G418 cassette is flanked by AscI sites. This vector can be used to force recombination into the genome of mammalian cells following transfection and selection using G418, although this method can be inefficient. It can also be used conjunction with the SV40 origin of replication in cells expressing the SV40 large T antigen (such as 293T cells) to make stable cells lines following transfection and selection.


G418 Selection notes: Although the gene name in this vector is neo, neomycin cannot be used in mammalian, or other eukaryotic cells, because it is ineffective at inhibiting eukaryotic ribosomes. For this reason, the plasmid must be selected in mammalian cells using G418 (otherwise known as Geneticin).


Quality Validation: This vector has been demonstrated to express reporter genes to high levels under the CMV promoter. The start codon of these reporters was positioned within the NcoI site and the stop codon was positioned within the XbaI site. Expression was validated in the A549 lung carcinoma cell line. The Ub Neo/G418 cassette has also been validated in the same cell line and shown to induce resistance to G418 (Geneticin).  

Quality Sequencing Analysis: This vector has been fully sequenced using primers F1-F10. The sequences and details of these primers are available through our website.

Genetic Modifications to standard parts:

  • CMV promoter – an NcoI site has been ablated in the CMV promoter. This change does not reduce expression.
  • KanR cassette – This KanR resistance region is not a wild type sequence, it has been modified to remove all restriction sites that conflict with the SnapFast system and to retain a high level of antibiotic resistance. It has been validated in E.coli.
  • The Neo/G418 gene has been modified to remove NcoI, EagI, PstI and SphI sites to ensure compatibility with all of our products. These are all conservative changes and do not change the amino acid sequence.  
  • The Ubiqitin (Ub) promoter in this vector has been modified to remove BseRI, StuI and SpeI sites. These changes do not reduce expression.    

Restriction site notes:

  • Bgl2, KpnI, SwaI, AscI and PmeI each cut the vector at two sites positioned to flank the promoter, start codon, origin, Ubiquitin Neo/G418 cassette, and the KanR, respectively.
  • BsgI and BseRI recognise non-palindromic DNA sequences and cleave upstream of their recognition sites, within the stop codon that is found inside the XbaI restriction site.