Automated system for polynucleotide synthesis and purification
First Claim
1. A method for synthesizing a polynucleotide of a predetermined sequence, the method comprising the steps of:
- (a) providing a nonswellable porous polystyrene support which remains substantially mechanically rigid during synthesis and which has a crosslink ration in the range of 10 to 60 percent;
(b) providing a 5'"'"'-blocked protected nucleoside having a 3'"'"'-hydroxyl and a 5'"'"'-hydroxyl, the 5'"'"'-blocked protected nucleoside being attached to the nonswellable porous polystyrene support, such that the 5'"'"'-blocked protected nucleoside forms a protected correct-sequence chain;
(c) deblocking the 5'"'"'-hydroxyl of the correct-sequence chain;
(d) reacting with the 5'"'"'-hydroxyl of the correct-sequence chain a 5'"'"'-blocked protected nucleoside monomer selected from the group consisting of 5'"'"'-blocked protected nucleoside-3'"'"'-phosphoramidite and 5'"'"'-blocked protected nucleoside-3'"'"'-hydrogen phosphonate to form either a protected correct-sequence chain or a failure sequence, the failure sequence having a 5'"'"'-hydroxyl, wherein at least ninety-nine percent of the 5'"'"'-hydroxyls of the correct-sequence chains react with the 5'"'"'-blocked protected nucleoside monomer;
(e) repeating steps (c) and (d) until the polynucleotide of the predetermined sequence is obtained; and
(f) cleaving the polynucleotide from the nonswellable porous polystyrene support to form a cleavage mixture.
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Abstract
A method and system for polynucleotide synthesis are provided which employ solid phase synthesis on a nonswellable porous polystyrene support by phosphoramidite or hydrogen phosphonate chemistries. The polystyrene support gives rise to fewer tritylated failure sequences caused by chain growth from extraneous support sites, and allows lower amounts of monomer reactants to be used to achieve equal or better coupling efficiencies as those achieveable with CPG. The method and system also employ nucleoside intermediates whose exocyclic amines are protected by base-labile groups which permit simultaneous cleavage and deprotection of the completed polynucleotide chain in the presence of the solid phase support. This latter feature allows practical automation of both the synthesis and purification of polynucleotides.
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Citations
17 Claims
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1. A method for synthesizing a polynucleotide of a predetermined sequence, the method comprising the steps of:
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(a) providing a nonswellable porous polystyrene support which remains substantially mechanically rigid during synthesis and which has a crosslink ration in the range of 10 to 60 percent; (b) providing a 5'"'"'-blocked protected nucleoside having a 3'"'"'-hydroxyl and a 5'"'"'-hydroxyl, the 5'"'"'-blocked protected nucleoside being attached to the nonswellable porous polystyrene support, such that the 5'"'"'-blocked protected nucleoside forms a protected correct-sequence chain; (c) deblocking the 5'"'"'-hydroxyl of the correct-sequence chain; (d) reacting with the 5'"'"'-hydroxyl of the correct-sequence chain a 5'"'"'-blocked protected nucleoside monomer selected from the group consisting of 5'"'"'-blocked protected nucleoside-3'"'"'-phosphoramidite and 5'"'"'-blocked protected nucleoside-3'"'"'-hydrogen phosphonate to form either a protected correct-sequence chain or a failure sequence, the failure sequence having a 5'"'"'-hydroxyl, wherein at least ninety-nine percent of the 5'"'"'-hydroxyls of the correct-sequence chains react with the 5'"'"'-blocked protected nucleoside monomer; (e) repeating steps (c) and (d) until the polynucleotide of the predetermined sequence is obtained; and (f) cleaving the polynucleotide from the nonswellable porous polystyrene support to form a cleavage mixture. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. In a method of synthesizing a polynucleotide of a predetermined sequence, the method of the type wherein nucleoside phosphoramidite monomers are coupled step-wise to a correct-sequence chain attached to a solid phase support in a solvent, an improvement comprising:
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providing a nonswellable porous polystyrene support which remains substantially mechanically rigid during synthesis and which has a crosslink ratio in the range of 10 to 60 percent; and coupling said nucleoside phosphoramidite monomer to said correct-sequence chain with a step-wise yield of at least ninety-nine percent. - View Dependent Claims (16, 17)
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Specification