Oligonucleotide synthesis (or gene synthesis) is used for several applications Prior to automated methods of oligo production, oligonucleotide synthesis was. Bio-Synthesis provides Custom oligo synthesis services since Bio-Synthesis is USA Based company which provides Custom Oligonucleotide Synthesis. Summary of solid-phase oligonucleotide synthesis cycle. In step 1, Detritylation, the 5'-DMT protecting group is removed from the first, solid-support-linked.


Author: Terrill Ritchie
Country: Georgia
Language: English
Genre: Education
Published: 18 December 2017
Pages: 122
PDF File Size: 23.28 Mb
ePub File Size: 22.85 Mb
ISBN: 854-4-75253-735-3
Downloads: 78572
Price: Free
Uploader: Terrill Ritchie


Oligonucleotide synthesis is carried out by a stepwise addition of oligonucleotide synthesis residues to the 5'-terminus of the growing chain until the desired sequence is assembled.


Each addition is referred to as a oligonucleotide synthesis cycle Scheme 5 and consists of four chemical reactions: The orange-colored DMT cation formed is oligonucleotide synthesis out; the step results in the solid support-bound oligonucleotide precursor bearing a free 5'-terminal hydroxyl group.

It is worth remembering that conducting detritylation for oligonucleotide synthesis extended time or with stronger than recommended solutions of acids leads to depurination of solid support-bound oligonucleotide and thus reduces the yield of the desired full-length product.

The Chemical Synthesis of Oligonucleotides

Coupling[ edit ] A 0. A more oligonucleotide synthesis information on the use of various coupling agents in oligonucleotide synthesis can be found in a recent review.

The activated phosphoramidite in 1. In contrast, sterically hindered 2'-O-protected ribonucleoside phosphoramidites require min to be coupled in high yields. Generally, oligonucleotide synthesis larger the scale of the synthesis, the lower the excess and the higher the concentration of the phosphoramidites is used.

In contrast, the concentration of the activator is primarily determined by its solubility in acetonitrile and is irrespective of oligonucleotide synthesis scale of oligonucleotide synthesis synthesis.

Upon the oligonucleotide synthesis of the coupling, any unbound reagents and by-products are removed by washing. Capping[ edit ] The capping step is performed by treating the solid support-bound material with a mixture of acetic anhydride and 1-methylimidazole or, less oligonucleotide synthesis, DMAP as catalysts and, in the phosphoramidite method, serves two purposes.

After the completion of the coupling reaction, a small percentage of the solid support-bound 5'-OH groups 0.


The unreacted 5'-hydroxy groups are, to a large extent, acetylated by the capping mixture. It has also been reported that phosphoramidites oligonucleotide synthesis with 1H-tetrazole react, to a small extent, with the O6 position of guanosine. The apurinic oligonucleotide synthesis thus formed are readily cleaved in the course of the final deprotection of the oligonucleotide under the basic conditions see below to give two shorter oligonucleotides thus reducing the yield of the full-length product.

On the other hand, if the capping step is performed prior to sulfurization, the solid support oligonucleotide synthesis contain the residual acetic anhydride and N-methylimidazole left after the capping step.


The capping mixture interferes oligonucleotide synthesis the sulfur transfer reaction, which results in the extensive formation of the phosphate triester internucleosidic linkages in place of the desired PS triesters.

Therefore, for the synthesis of OPS, it is advisable to conduct the sulfurization step prior to oligonucleotide synthesis capping step.

Oligonucleotide synthesis, Custom Oligo Synthesis company - Bio-Synthesis

Oxidation[ edit ] The newly formed tricoordinated phosphite triester linkage is not natural and is of limited stability under the conditions of oligonucleotide synthesis.

The treatment of the support-bound material with iodine and water in the presence of a weak base pyridine, lutidineor collidine oxidizes the phosphite triester into a tetracoordinated phosphate triester, a protected precursor of the naturally occurring phosphate diester internucleosidic linkage.

In the latter case, the sulfurization step is best oligonucleotide synthesis out prior to oligonucleotide synthesis.

  • Solid-phase oligonucleotide synthesis
  • Oligo Synthesis

Solid supports[ edit ] In solid-phase synthesis, an oligonucleotide synthesis being assembled is covalently bound, via its 3'-terminal hydroxy group, to a solid support material and remains attached to it over the entire course of the chain assembly. The solid support is oligonucleotide synthesis in columns whose dimensions depend on the scale of synthesis and may vary between 0.

oligonucleotide synthesis More recently, high-throughput oligonucleotide synthesis where the solid support is contained in the wells of multi-well plates most often, 96 or wells per plate became a method of choice for parallel synthesis of oligonucleotides on small scale.

Solid support material[ edit ] In contrast to organic solid-phase synthesis and peptide synthesis oligonucleotide synthesis, the synthesis of oligonucleotides proceeds best on non-swellable or low-swellable solid supports.

To make native CPG suitable for further processing, the surface of the material is treated with 3-aminopropyl oligonucleotide synthesis to give aminopropyl CPG. The amino group is then used as an anchoring point for linkers suitable for oligonucleotide synthesis see below. Commercial solid supports for oligonucleotide synthesis.

Mechanism of 3'-dephosphorylation of oligonucleotides assembled on universal solid supports.