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pMDLg/pRRE
Gene/insert name: HIV-1 GAG/POL
Insert size (bp): Unknown
Species of gene(s): Other
Vector backbone: pMD (Search Vector Database)
Type of vector: Mammalian expression,Lentiviral,Packaging
Backbone size (bp): 8895
5' Sequencing primer: CMV Fwd (List of Sequencing Primers)
Bacteria resistance: Ampicillin
High or low copy: High Copy
Grow in standard E. coli @ 37C: Yes
Plasmid Provided In: DH5a
Principal Investigator: Didier Trono
Comments: This 3rd generation LV packaging plasmid includes gag, coding for the virion main structural proteins; pol, responsible for the retrovirus-specific enzymes; and RRE, a binding site for the Rev protein which facilitates export of the RNA from the nucleus. This plasmid does not include Rev. The third generation packaging system offers maximal biosafety but is more cumbersome, as it involves the transfection of four different plasmids in the producer cells. Example of a 3rd generation packaging combo: pMDLg/pRRE + pRSV-Rev + pMD2.G.
Please note that most Trono lab lentivectors contain a wt 5'LTR and can be packaged only using the 2nd generation packaging system (as the wt 5'LTR requires TAT for activation). If you wish to use the 3rd generation packaging system, you need to have a lentivector with a chimeric 5'LTR (e.g. CCL-, RRL-, etc) in which the HIV promoter is replaced with CMV or RSV, thus making it TAT-independent. The lentivectors carrying the chimeric 5'LTR can be packaged into either a 2nd or 3rd generation packaging system.
Article: A third-generation lentivirus vector with a conditional packaging system. Dull T et al. (J Virol. 1998 Nov . 72(11):8463-71. Pubmed)