In general terms, “click chemistry” describes reactions used to join small chemical subunits in a modular fashion, yielding singular reaction products that are typically physiologically stable and stereospecific. It is an option for complex oligonucleotide synthesis when traditional methods provide less than optimal results. Oligonucleotide chemistry applications make use of azide alkyne Huisgen cycloaddition, a two-step process that uses quantitative chemical reactions of alkyne and azide moieties to create covalent carbon-heteroatom bonds between biochemical species . Copper(I) acts as a catalyst to form a 1,2,3-triazole between an azide and terminal alkyne . These reactions are strongly exothermic and so exhibit a large thermodynamic driving force. The technology is reliable and stable, making it an ideal oligonucleotide labeling method.
Some of the benefits of this click chemistry reaction include:
- Occurs in aqueous solution, at room temperature
- Stable toward H2O, O2, and under most organic synthesis conditions
- Does not have side reactions
- Is a robust catalytic process
- Lacks functional group interference
- Yields a thermally and hydrolytically stable triazole connection
- Offers an unprecedented level of selectivity, reliability, and scope for syntheses that require covalent linkages between biochemical species
|Modification name||Used for modifying oligos that have:|
|5′, Int, 3′ Azide (NHS Ester)||5′, 3′, or internal azide functional group|
|5′ Hexynyl||5′ alkyne functional group|
|5′, Int, 3’ 5-Octadiynyl dU||5′, 3′, or internal alkyne functional group|
|5′, Int Biotin (Azide)||5′ or internal biotin functional group|
|5′, Int 6-FAM (Azide)||5′ or internal 6-FAM functional group|
|5′, Int 5-TAMRA (Azide)||5′ or internal 5-TAMRA functional group
To order an alkyne- or azide-modified oligonucleotide: specify the nucleic acid sequence along with the appropriate alkyne or azide modifications included in the sequence.
To order an oligonucleotide modified by a 1,2,3-triazole linkage of biotin, 6-FAM, or 5-TAMRA: select the desired azide modification at the desired location within the nucleic acid sequence. IDT will synthesize the oligonucleotide, perform the click chemistry reaction, and purify the product.