Invitrogen™ One Shot™ Stbl3™ Chemically CompetentE. coli

Description

• Description One Shot Stbl3 Chemically Competent E
• coli are designed for cloning direct repeats found in lentiviral expression vectors as these cells reduce the frequency of homologous recombination of direct repeats found in lentiviral vectors (ViraPower Lentiviral Expression kits) and other retroviral vectors (instability-prone HIV-based plasmids)
• The Stbl3 strain has been essential for many applications, including genome editing CRISPR workflows, vaccine development (including SARS-CoV-2 vaccine research), cloning, and maintaining vectors with multiple repeats (e.g., gene coding protein with repeated sequence)
• The transformation efficiency of One Shot Stbl3 chemically competent cells is >1 x 10 8 cfu/μg plasmid DNA
• The Stbl3 strain is derived from the HB101 E
• coli strain with a hybrid K-12 and B strain genome
• It contains the rec A13 allele of the rec A mutation that reduces nonspecific recombination occurrence in cloned DNA
• Mutations in the Stbl3 methylation-dependent restriction system ( mcr B, mrr, and hsd S20) allow construction of cloning genomic DNA
• This strain has end A1+, a nonspecific endonuclease I that digests DNA
• The Stbl3 strain also reproducibly yields more plasmid DNA than DH strains (10-fold or more plamsmid DNA than the TOP10 strain) and sustainably produces high titer lentivirus
• One Shot Stbl3 Chemically Competent E
• coli offer: • Expected efficiency of >1 x 10 8 transformants/μg plasmid DNA • Optimal performance for the propagation of lentiviral vectors and maintenance of direct repeats • Enhanced genomic DNA cloning capacity ( mcr B, mrr, and hsd S20) • Capable of producing high DNA yields Note: For optimal performance and to maintain plasmid with complex repeat sequences, Stbl3 cells should be cultured at 30°C
• When performing plasmid DNA isolation from Stbl3 cells that have wild type endonuclease I ( end A1+), ensure that buffers contain 10 mM EDTA
• EDTA will inactivate the endonuclease and avoid DNA nicking and vector degradation (follow plasmid DNA purification kit instructions for end A1+ E
• coli strains)
• Easy-to-use One Shot format Stbl3 Chemically Competent E
• coli cells are supplied in the convenient, single-reaction One Shot format
• The single-tube, single-use format allows all steps of the transformation protocol, up to plating, to take place in the same tube, thereby helping save time and prevent contamination
• Genotype F – mcr B mrr hsd S20(r B –, m B –) rec A13 sup E44 ara -14 gal K2 lac Y1 pro A2 rps L20(StrR) xyl -5 λ– leu mtl -1 Find the strain and format that fit your needs • Other Stbl strains are available with different genetic background
• • The Stbl3 strain is available in MultiShot format for high throughput applications
• Order Info Shipping Condition: Dry Ice