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Oligo Synthesis

Oligo Synthesis : CEPs

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GAT Trimer Phosphoramidite

GAT Trimer Phosphoramidite

Glen Research

GAT Trimer Phosphoramidite

Structure

Catalog Number: 13-1203-xx

Description: GAT Trimer Phosphoramidite

5'-Dimethoxytrityl-N2-isobutyryl-2'-deoxyGuanosine-3'->
5'-o-chlorophenyl-phosphoryl-N6-benzoyl-2'-deoxyAdenosine-3'->
5'-o-chlorophenyl-phosphoryl-2'-deoxyThymidine-3'-[(2-cyanoethyl)-
(N,N-diisopropyl)]-phosphoramidite
Formula: C83H89Cl2N14O21P3 M.W.: 1780.50

Diluent: Anhydrous Acetonitrile/Dichloromethane 1:3 (v/v)
Coupling: 15 minute coupling time recommended.
Deprotection: 30% NH4OH for 17 hours at room temperature followed by an additional 4 hours at 55°C.
Storage: Freezer storage, -10 to -30°C, dry
Stability in Solution: n/a

OLIGONUCLEOTIDE-DIRECTED MUTAGENESIS

TRIMER PHOSPHORAMIDITES

In principle, the simplest approach for oligonucleotide-directed mutagenesis would be the use of trimer phosphoramidites. Of the 64 possible combinations of codons, only 20 codons would be required to cover the 20 amino acids, although, in practice, several codons will likely be duplicated depending on the organism. Our trimers use the protection scheme described1-3 by Kayushin et al. There is a concern that the sequence of the trimers has to be verified. For example, CAT coding for histidine, has to be differentiated from TAC, coding for tyrosine. These two trimers have virtually identical lipophilicity and their identity cannot be clearly confirmed by HPLC. This problem has been solved4 using HPLC electrospray mass spectrometric analysis of the trimers, which provides data confirming molecular weight and sequence.

In Table 1, the trimers, their coding amino acid and their reaction factor (RF) are listed. The reaction factor is critical since the trimers will likely be mixed and they have differing reactivity in the coupling reaction. RF for AAC is 1.0 and for TAC is 1.6. Therefore, 1.6 equivalents of TAC are needed for every 1.0 equivalent of AAC for equal coupling. Mixtures can easily be made using equimolar solutions or the molecular weight of each trimer has to be used to generate the appropriate weights of each trimer to use if mixing by weight. An example of the preparation of a mixture of all 20 trimers is shown in the right column of Table 1 and completed in the footnotes.

All of the trimers are now available individually so that researchers can prepare custom mixtures. A mixture of all 20 trimers designed to produce equal coupling of all 20 is also available. If you require custom production of a specific mixture, please e-mail support@glenresearch.com for a quotation and projected delivery.

TABLE 1: TRIMER CODING AND PHYSICAL PARAMETERS

Trimer Amino Acid abbreviation MW RF MWxRF mg/10µmol
(adjusted for RF)
AAA Lys K 1911.5 1.1 2102.65 21.0 (11)
AAC Asn N 1887.5 1.0 1887.50 18.9 (10)
ACT Thr T 1774.5 1.3 2306.85 23.1 (13)
ATC Ile I 1774.5 1.2 2129.40 21.3 (12)
ATG Met M 1780.5 1.3 2314.65 23.1 (13)
CAG Gln Q 1869.5 2.0 3739.00 37.4 (20)
CAT His H 1774.5 1.9 3371.55 33.7 (19)
CCG Pro P 1845.5 1.8 3321.90 33.2 (18)
CGT Arg R 1756.5 1.1 1932.15 19.3 (11)
CTG Leu L 1756.5 1.2 2107.80 21.1 (12)
GAA Glu E 1893.5 1.9 3597.65 36.0 (19)
GAC Asp D 1869.5 1.3 2430.35 24.3 (13)
GCT Ala A 1756.5 1.5 2634.75 26.3 (15)
GGT Gly G 1762.5 1.1 1938.75 19.4 (11)
GTT Val V 1667.5 1.9 3168.25 31.7 (19)
TAC Tyr Y 1774.5 1.6 2839.20 28.4 (16)
TCT Ser S 1661.4 1.3 2159.82 21.6 (13)
TGC Cys C 1756.5 1.5 2634.75 26.3 (15)
TGG Trp W 1762.5 2.4 4230.00 42.3 (24)
TTC Phe F 1661.4 1.3 2159.82 21.6 (13)
=530.0 mg

EXAMPLE OF PREPARATION OF TRIMER MIXTURE

Prepare 530 mg of the trimer mix, taking the amount (mg) for each trimer from the right column. Dissolve the trimer mix in dichloromethane (highest grade possible; acid-free). Evaporate to dryness to produce a homogenous mixture of all 20 trimers.

EXAMPLE OF PREPARATION OF TRIMER MIXTURE FOR THE SYNTHESIZER

Dissolve 530 mg, which is equivalent to 20X10 µmoles (normalized for RF) of the trimer mix in 2.0 mL of acetonitrile-dichloromethane mixture, 1:3 v/v to produce a 0.10N solution of trimers, ready for use in a synthesizer.

If you cannot find the answer to your problem below then please contact us or telephone 01954 210 200

GAT Trimer Phosphoramidite

GAT Trimer Phosphoramidite

Glen Research

Material Safety Data Sheet

Glen Report 24.2: Antisense Trimer Phosphoramidites - A New Method For Mutagenesis Spanning Entire Genes

If you cannot find the answer to your problem below then please contact us or telephone 01954 210 200

GAT Trimer Phosphoramidite

GAT Trimer Phosphoramidite

Glen Research

DILUTION/COUPLING DATA

The table below shows pack size data and, for solutions, dilutions and approximate couplings based on normal priming procedures. Please link for more detailed usage information with the various synthesizers.

ABI 392/394
Cat.No. Pack
Size
Grams/
Pack
0.1M Dil.
(mL)
LV40 LV200 40nm 0.2µm 1µm 10µm
Approximate Number of Additions
13-1203-90 100µmoles .178grams 1 20 12 7.5 5.45 4 1
13-1203-95 50µmoles .089grams .5 3.33 2 1.25 .91 .67 .17
Expedite
Cat.No. Pack
Size
Grams/
Pack
Dilution
(mL)
Molarity 50nm 0.2µm 1µm 15µm
Approximate Number of Additions
13-1203-90 100µmoles .178grams 1.5 .07 23.6 14.75 10.73 1.48
13-1203-95 50µmoles .089grams .75 .07 8.6 5.38 3.91 .54
Beckman
Cat.No. Pack
Size
Grams/
Pack
Dilution
(mL)
Molarity 30nm 200nm 1000nm

Approximate Number of Additions
13-1203-90 100µmoles .178grams 1.5 .07 25.2 15.75 11.45

13-1203-95 50µmoles .089grams .75 .07 10.2 6.38 4.64

If you cannot find the answer to your problem below then please contact us or telephone 01954 210 200