And displacement is a fundamental reaction for both in vivo and in vitro biological events such as genomic DNA replication, transcription, and PCR. It is usually a very fast reaction with enzyme assistance in vivo, but it takes time to proceed in vitro. Therefore, the use of an ultrafast photo-cross-linking reaction would greatly improve stability, and possibly significantly accelerate the DNA strand exchange reaction (Figure 5, Page 3).4
The stabilization of double-strand formation using ultrafast photo-crosslinking can also be applied to RNA fluorescence in situ hybridization (FISH). In the RNA FISH method, the wash steps are necessary to remove nonspecific signals but can also cause problems such as low detection signal and poor reproducibility. A photo-cross-linkable FISH probe containing CNVK was introduced into the immobilized E. coli, and RNA FISH was performed using 16S rRNA as a target (Figure 7, Page 4).1025065-69-3 Description Fluorescence was confirmed even when the wash steps utilized buffer containing formamide, indicating that stable detection is possible without wash conditions7. In addition, strong fluorescence was confirmed even for targets with undetectable sensitivity.
Technical Brief: Non-Aqueous Oxidation using CSO
In previous Glen Report articles, we have demonstrated that the iodine oxidation step during DNA synthesis cycles has the potential to damage some minor bases and modifiers. In this article, we have compiled some of the previous information to show that (1S)-(+)-(10-camphorsulfonyl)oxaziridine (CSO) (1) is an ideal nonaqueous oxidizer for oligonucleotide synthesis.idizers have been the standard for DNA and RNA synthesis since the advent of automated synthesizers. They are fast and efficient oxidizers, typically requiring less than 30 seconds for complete oxidation of phosphite triesters to phosphate triesters. However, while iodine-based oxidizers work well for most applications, there are some circumstances where non-aqueous oxidizers may be advantageous, especially where the bases or linkages being produced are sensitive to the presence of water and/or iodine during synthesis. Non-aqueous oxidizers, typically peroxides, including tert-butyl hydroperoxide, cumene hydroperoxide, hydrogen peroxide, and bistrimethylsilyl peroxide, among others, have also been employed in DNA synthesis.501-36-0 custom synthesis These peroxides tend to be unstable, requiring that they be freshly formulated just prior to use, and so are difficult to use in routine automated synthesis, hence the need for a stable, effective non-aqueous oxidizer.PMID:28613535
was already known that the use of low water oxidizers improved the synthesis of oligos containing methyl phosphonates. However, we were able to show that a 0.5M solution of CSO in acetonitrile (40-4632-xx) gave exellent results in the synthesis of chimeric oligonucleotides containing methyl phosphonate linkages.
to damage by iodine during oxidation, we now recommend the use 0.5M CSO in anhydrous acetonitrile with a 3 minute oxidation time, if there are 6 incorporations of inosine within a sequence.
K Phosphoramidite
iPr-Pac group on the dG with acetyl, use the UltraMild Cap Mix A (40-4210xx/ 40-4212-xx). For deprotection: If UltraMILD reagents were used, use 0.05M Potassium Carbonate in Methanol for 4 hours at Room Temperature OR for 2 hours at Room Temperature in 30% Ammonium Hydroxide. If standard bases were used, deprotection in Ammonium Hydroxide at Room Temperature for 24-36 hours will give acceptable yields.
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