PACE Phosphoramidites

PACE modifications have enjoyed a resurgence in interest as applied to the field of CRISPR gene editing. In an initial publication, it was shown that single guide RNAs (sgRNA) provided significantly higher activity in cells when 2‘-O-methylthiophosphonoacetates were incorporated on the ends of the guide RNA to protect against cellular nucleases.1  In subsequent studies, 2’-OMe PACE modified sgRNAs were also shown to significantly increase on-target specificity of the CRISPR-Cas9 DNA cleavage in eukaryotic cells. In a recent paper, the incorporation of 2’-OMe PACE modified nucleotides in the 20-nucleotide guide region of the sgRNA was shown to decrease off-target cutting by over an order of magnitude while in most cases increasing the overall on-target efficiency as compared to unmodified single guide RNA.2

As an optimal cycle, we recommend using DCI as an activator (30-3150-XX) and a 15 minute coupling time.  Following coupling, cap using Unicap (10-4410-XX) with a regular coupling time and then oxidize using 0.5 M CSO for 3 minutes.  Alternatively, a 33 minute coupling time using 0.45 M tetrazole, oxidation using low-water iodine (40-4032-XX) followed by capping with 6.5% DMAP as Cap B will give acceptable results.  For deprotection, pre-treat the synthesis column with 1.5% DBU in anhydrous acetonitrile for 60 minutes at room temperature to remove 1,1-dimethyl-2-cyanoethyl protecting groups. Rinse the column with acetonitrile, dry under argon and complete the deprotection with 40% aqueous methylamine for 2 hours at room temperature.

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  • dA-PACE Phosphoramidite
    dA-PACE Phosphoramidite (10-1140)
    Catalog #: 10-1140
    Formal Name:

    5'-Dimethoxytrityl-N-benzoyl-2'-deoxyAdenosine, 3'-O-(N,N-diisopropylamino)-phosphinyl-1,1-dimethyl-2-cyanoethyl acetate

  • Ac-dC-PACE Phosphoramidite
    Ac-dC-PACE Phosphoramidite (10-1150)
    Catalog #: 10-1150
    Formal Name:

    5'-Dimethoxytrityl-N-acetyl-2'-deoxyCytidine, 3'-O-(N,N-diisopropylamino)-phosphinyl-1,1-dimethyl-2-cyanoethyl acetate

  • dG-PACE Phosphoramidite
    dG-PACE Phosphoramidite (10-1160)
    Catalog #: 10-1160
    Formal Name:

    5'-Dimethoxytrityl-N-isobutyryl-2'-deoxyGuanosine, 3'-O-(N,N-diisopropylamino)-phosphinyl-1,1-dimethyl-2-cyanoethyl acetate

  • dT-PACE Phosphoramidite
    dT-PACE Phosphoramidite (10-1170)
    Catalog #: 10-1170
    Formal Name:

    5'-Dimethoxytrityl-2'-deoxyThymidine, 3'-O-(N,N-diisopropylamino)-phosphinyl-1,1-dimethyl-2-cyanoethyl acetate

  • 2'-OMe-A-PACE Phosphoramidite
    2'-OMe-A-PACE Phosphoramidite (10-3150)
    Catalog #: 10-3150
    Formal Name:

    5'-Dimethoxytrityl-N-benzoyl-2'-OMe-Adenosine, 3'-O-(N,N-diisopropylamino)-phosphinyl-1,1-dimethyl-2-cyanoethyl acetate

  • 2'-OMe-Ac-C-PACE Phosphoramidite
    2'-OMe-Ac-C-PACE Phosphoramidite (10-3151)
    Catalog #: 10-3151
    Formal Name:

    5'-Dimethoxytrityl-N-acetyl-2'-OMe-Cytidine, 3'-O-(N,N-diisopropylamino)-phosphinyl-1,1-dimethyl-2-cyanoethyl acetate

  • 2'-OMe-G-PACE Phosphoramidite
    2'-OMe-G-PACE Phosphoramidite (10-3152)
    Catalog #: 10-3152
    Formal Name:

    5'-Dimethoxytrityl-N-isobutyryl-2'-OMe-Guanosine, 3'-O-(N,N-diisopropylamino)-phosphinyl-1,1-dimethyl-2-cyanoethyl acetate

  • 2'-OMe-U-PACE Phosphoramidite
    2'-OMe-U-PACE Phosphoramidite (10-3153)
    Catalog #: 10-3153
    Formal Name:

    5'-Dimethoxytrityl-2'-OMe-Uridine,3'-O-(N,N-diisopropylamino)-phosphinyl-1,1-dimethyl-2-cyanoethyl acetate

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8 Product Results