Now available: EnGen Spy Cas9 HF1 NEB #M0667 for reduction of off-target cleavage
We are excited to announce that all reaction buffers are now BSA-free. NEB began switching our BSA-containing reaction buffers in April 2021 to buffers containing Recombinant Albumin (rAlbumin) for restriction enzymes and some DNA modifying enzymes. Find more details at www.neb.com/BSA-free.
Ideal for direct introduction of Cas9/sgRNA complexes into cells
Dual NLS for improved transport to the nucleus
Compatible with EnGen® sgRNA Synthesis Kit, S. pyogenes (NEB #E3322S) and the EnGen Mutation Detection Kit (NEB #E3321S)
EnGen Spy Cas9 NLS, is an RNA-guided endonuclease that catalyzes site- specific cleavage of double stranded DNA. The location of the break is within the target sequence 3 bases from the NGG PAM (Protospacer Adjacent Motif) (1). The PAM sequence, NGG, must follow the targeted region on the opposite strand of the DNA with respect to the region complementary sgRNA sequence. EnGen Spy Cas9 NLS contains Simian virus 40 (SV40) T antigen nuclear localization sequence (NLS) on the N- and C- termini of the protein.
Increased genome editing efficiency using Cas9 RNP delivery
Cas9 and sgRNA targeting a human gene were delivered to HEK293 cells by transfection. Transfected plasmid DNA contained expression cassettes for 2x NLS (N- and C-terminal) Cas9 and sgRNA. Plasmid DNA was delivered using TransIT-X2 (Mirus). Transfected mRNA was modified with pseudouridine and 5-methylcytosine and encoded 2x NLS (N-and C-terminal) Cas9. sgRNA was co-transfected with the mRNA using TransIT-mRNA. Cas9 RNPs were delivered in reverse transfections using Lipofectamine RNAiMAX (Life Technologies) using 10 nanomolar final concentration of ribonucleoprotein (RNP). Cas9 has no NLS in the protein sequence. EnGen Cas9 has N- and C-terminal NLSs. The efficiency of editing was determined using T7 Endonuclease I assay and is expressed as % modification.
Product Source
An E. coli strain that carries the cloned Cas9 gene from Streptococcus pyogenes with N- and C-terminal Simian virus 40 (SV40) nuclear localization signals (NLS) and a N- terminal 6XHis tag.
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