SYNTHESIS OF OLIGONUCLEOTIDES COMPRISING ACHIRAL 3'-S- OR 5'-S-PHOSPHOROTHIOLATE INTERNUCLEOSIDE LINKAGE
申请人:Roche Innovation Center Copenhagen A/S
公开号:EP3491002A2
公开(公告)日:2019-06-05
OLIGONUCLEOTIDE SYNTHESIS
申请人:ROCHE INNOVATION CENTER COPENHAGEN A/S
公开号:US20210309690A1
公开(公告)日:2021-10-07
The invention relates to a process for the manufacture of an oligonucleotide comprising at least one non-chiral phosphorothioate intemucleoside linkage of formula (I) wherein R
1
is as defined in the description and in the claims.
Thermal stabilisation of RNA·RNA duplexes and G-quadruplexes by phosphorothiolate linkages
作者:Michael M. Piperakis、James W. Gaynor、Julie Fisher、Richard Cosstick
DOI:10.1039/c2ob26940f
日期:——
The effect of 3′-S-phosphorothiolate linkages on the stability of RNA·RNA duplexes and G-quadruplex structures has been studied. 3′-Thio-2′-deoxyuridine was incorporated into RNA duplexes and thermal melting studies revealed that the resulting 3′-S-phosphorothiolate linkages increased the stability of the duplex to thermal denaturation. Additionally, and contrary to expectation, a similar effect on duplex stability was observed when the same thionucleoside was incorporated into the RNA strand of a RNA·DNA duplex. A suitably protected derivative of 3′-thio-2′-deoxyguanosine was prepared using an oxidation–reduction strategy and this residue also increased the thermal stability the [d(TGGGGT)]4 G-quadruplex when positioned centrally. The results are discussed in terms of the influence that the sulfur atom has on the conformation of the furanose ring and imply that the previously noted high thermal stability of parallel RNA quadruplexes is not derived from H-bonding interactions of the 2′-hydroxyl group, but can be attributed to conformational effects.
Reverse-direction (5′→3′) synthesis of oligonucleotides containing a 3′-S-phosphorothiolate linkage and 3′-terminal 3′-thionucleosides
作者:James W. Gaynor、Michael M. Piperakis、Julie Fisher、Richard Cosstick
DOI:10.1039/b923545k
日期:——
5′-oxygen to the 3′-thiol function. 5′→3′ Synthesis of oligonucleotides gave relatively poor yields for the internal incorporation of 3′-thionucleosides [to give a 3′-S-phosphorothiolate (3′-SP) linkage] and multiple 3′-SP modifications could not be introduced by this method. However, the reverse direction approach provided an efficient route to oligonucleotides terminating with a 3′-thionucleoside