2008, Marx, Andreas, Jung, Karl-Heinz

4'-C-Modified nucleotides and oligonucleotides have been explored extensively recently. The motivations for these investigations drive from the development of new drugs to investigations of complex biological processes. This review covers the common strategies for the synthesis of 4'-C-modified nucleosides that have been subsequently incorporated into oligonucleotides. After a brief depiction of two mainly followed routes for the generation of 4'-C-modified nucleosides, the synthetic efforts of the modified nucleotides are grouped into those bearing hydrophobic or polar modifications. Subsequently strategies for the incorporation of the respective nucleotides into oligonucleotides by automated DNA synthesis are discussed.

2008, Jung, Karl-Heinz, Marx, Andreas

2005-09, Jung, Karl-Heinz, Marx, Andreas

Transmission of the genetic information from the parental DNA strand to the offspring is crucial for the survival of any living species. In nature, all DNA synthesis in DNA replication, recombination and repair is catalyzed by DNA polymerases and depends on their ability to select the canonical nucleobase pair from a pool of structurally similar building blocks. Recently, a wealth of valuable new insights into DNA polymerase mechanisms have been gained through application of carefully designed synthetic nucleotides and oligonucleotides in functional enzyme studies. The applied analogues exhibit features that differ in certain aspects from their natural counterparts and, thus, allow investigation of the involvement and efficacy of a chosen particular aspect on the entire complex enzyme mechanism. This review will focus on a depiction of the efforts that have been undertaken towards the development of nucleotide analogues with carefully altered properties. The different approaches will be discussed in the context of the motivation and the problem under investigation.