Synthesis of a biotin-conjugate of phosmidosine O-ethyl ester as a G1 arrest antitumor drug

Phosphorus Compounds of Natural Origin: Prebiotic, Stereochemistry, Application

Organophosphorus compounds play a vital role as nucleic acids, nucleotide coenzymes, metabolic intermediates and are involved in many biochemical processes. They are part of DNA, RNA, ATP and a number of important biological elements of living organisms. Synthetic compounds of this class have found practical application as agrochemicals, pharmaceuticals, bioregulators, and othrs. In recent years, a large number of phosphorus compounds containing P-O, P-N, P-C bonds have been isolated from natural sources. Many of them have shown interesting biological properties and have become the objects of intensive scientific research. Most of these compounds contain asymmetric centers, the absolute configurations of which have a significant effect on the biological properties of the products of their transformations. This area of research on natural phosphorus compounds is still little-studied, that prompted us to analyze and discuss it in our review. Moreover natural organophosphorus compounds represent interesting models for the development of new biologically active compounds, and a number of promising drugs and agrochemicals have already been obtained on their basis. The review also discusses the history of the development of ideas about the role of organophosphorus compounds and stereochemistry in the origin of life on Earth, starting from the prebiotic period, that allows us in a new way to consider this most important problem of fundamental science.

Immobilization of DNA with nitrogen mustard-biotin conjugate for global epigenetic analysis

We report the quantitative analysis of 5-methylcytosine, a representative epigenetic modification in genomic DNA, with an enzyme-linked immunosorbent assay (ELISA). We synthesized a novel hetero-bifunctional linker molecule consisting of nitrogen mustard and biotin to capture DNA on the surface of biosensing devices. The molecule can successfully immobilize genomic DNA on a streptavidin coated 96-well microplate, which was then employed for immunochemical epigenetic assessment. We achieved the sensitive and quantitative detection of 5-mC in genomic DNA samples. The CpG methylation ratios obtained from our system for mouse brain and mouse small intestine genomes were 79% and 82%, respectively. These numbers are in good agreement with the previously reported methylation ratio of 75-85%, which was identified by whole genome bisulfite sequencing. Accordingly, the present technology using our novel bifunctional linker molecule provides a fast, easy, and inexpensive method for epigenetic assessment, without the need for any conventional bisulfite treatment, polymerase chain reaction (PCR), or sequencing.

Novel selective biocatalytic deacylation studies on key precursors for bicyclonucleosides

Immobilized Candida antarctica lipase and Thermomyces lanuginosus lipase catalyze the deacylation of precursors of LNA analogs, 4'-C-acyloxymethyl-2',3',5'-tri-O-acyl-beta-L-threo-pentofuranosylthymine and 4-C-acyloxymethyl-3,5-di-O-acyl-1,2-O-(1-methylethylidene)-beta-L-threo-pentofuranose, respectively in a highly selective and efficient manner.

Synthesis and biological properties of new phosmidosine analogs having an N-acylsulfamate linkage

A new phosmidosine analog 10, in which the proline and 8-oxoadenosine moieties were linked by an N-acyl sulfamate linkage, was successfully synthesized by the sulfamoylation of an 8-oxoadenosine derivative 5 followed by coupling with an L-proline derivative 8. An L-alanine-substituted derivative 13 and its derivative 14 without the alanyl residue were also synthesized. The morphological reversion activity of these synthetic compounds in v-src(ts) NRK cells and their antitumor activity in L1210 and KB cells were studied. As the result, neither L-proline- nor L-alanine-substituted phosmidosine analogs 10 and 13 showed any antitumor activity. Contrary to these results, the derivative 14 lacking the amino acid residue showed potent antitumor activities against cancer cells.