Photo Cleavable Oligonucleotide Modification
We offer several photocleavable modifiers that are suitable for following applications.
5' PC biotinylated oligonucleotide exhibit similar properties to 5' biotin modification. They are suitable for capture by streptavidin. PC Biotin is rapidly and quantitatively cleaved from the 5'-terminus of the oligonucleotide using near-UV light at 300 þ 350nm.
PC amino or thiol modified oligonucleotides have proven to be very useful for the attachment of a variety of haptens and fluorophores, as well as for the tethering of the oligonucleotides to a diversity of beads and surfaces. PC amino modifier can be modified at 5' end of oligonucleotides that are suitable for subsequence photocleavage.
PC spacer can be used as an intermediary to attach any modification to the terminal end of oligonucleotides. After cleavage, a 5'-phosphate is generated on the DNA or RNA, rendering it suitable for further biological transformations, such as gene construction and cloning after ligation.
Purification
Desalting or cartridge purification is acceptable for spacer modified oligonucleotide. However, additional purification by HPLC is strongly recommended.
Quality Controls
Every oligo synthesized is strictly controlled for quality by using either MALDI-TOF mass spectrometry or polyacrylamide gel electrophoresis (PAGE) analysis. Final yields are determined using UV absorbance at OD260 In addition, we perform QC methods tailored to specific modifications, such as OD ratio measurement where appropriate .
Cleavage Protocol
Optimal cleavage is obtained with exposure to long-wave UV light in the 300-350 nm spectral range. Cleavage releases the oligo with a 5'-phosphate group.
Reference:
1. P. Ordoukhanian and J-S. Taylor, J. Am. Chem. Soc., 117, 9570-9571, 1995.
2. (a) F. Hausch and A. Jäschke, Nucleic Acids Research, 2000, 28, e35.
(b) F. Hausch and A. Jäschke, Tetrahedron, 2001, 57, 1261-1268.
3. T. Wenzel, T. Elssner, K. Fahr, J. Bimmler, S. Richter, I. Thomas, and M. Kostrzewa, Nucleosides, Nucleotides & Nucleic Acids, 2003, 22, 1579-1581.