Polynucleotides. LXI. Synthesis and properties of dinucleoside monophosphates containing 8,2'-S-cycloadenosine and 8,2'-S-cycloinosine residues. Sequence dependency of the stability of the stacking conformation.
作者:SEIICHI UESUGI、TOSHIO SHIDA、MORIO IKEHARA
DOI:10.1248/cpb.28.3621
日期:——
Three dinucleoside monophosphates containing 8, 2'-anhydro-8-thio-9-β-D-arabinofuranosyladenine (As) and its hypoxanthine derivative (Is), AspIs, IspAs and IspIs, were synthesized. Examination of their properties by ultraviolet absorption, circular dichroism and 1H nuclear magnetic resonance measurements and comparison with the properties of AspAs, which has been shown to take a left-handed stacked conformation, showed that all these dimers take a left-handed stacked conformation, and the order of extent of stacking is AspAs≈IspAs>AspIs≈IspIs. This sequence dependency of stability of stacking can be explained in terms of the mode of base-base overlap in a left-handed stack. A similar explanation may be applicable to the corresponding sequence dependency of natural dimers with a right-handed stack.
Vitamin B.sub.12 derivative, preparation process thereof, and use thereof
申请人:Teijin Limited
公开号:US05405839A1
公开(公告)日:1995-04-11
Vitamin B.sub.12 compounds, salts and pharmaceutical compositions containing said compounds represented by formula (I): ##STR1## wherein L, a ligand to the cobalt of the corrin ring, is selected from the group consisting of a cyano or adenosyl group, B is an imidazole group or a 5,6-dimethylbenzimidazole group, and R is a straight alkylene group having 1 to 8 carbon atoms, are disclosed. Methods for preparing compounds of Formula (I) as well as methods for using the compounds in in vitro assays, in cell growth studies and in in vivo studies using transplanted murine tumor cells are disclosed.
Composition for the treatment of immune deficiencies and methods for its preparation and use
申请人:——
公开号:US20010034324A1
公开(公告)日:2001-10-25
A complex of alpha-fetoprotein (AFP) and N-arachidonoyl aminoethyl phosphate (N-AAP) is shown to have significant immunostimulating properties and can therefore be used as a therapeutic agent in various indications, such as immune deficiencies and in particular immune deficiencies related to cancer therapy.
Disulfide dithymidines linked3′–5′ or 3′–6′ were synthesized and incorporated into oligonucleotides through a combined phosphotriester and phosphoramidite solid‐phase oligonucleotide synthesis approach. The disulfide links are cleaved and formed reversibly in the presence of thiols and oligonucleotides. This link was shown to be sequence‐adaptive in response to given templates in the presence of mercaptoethanol
Chemical synthesis of coenzyme A analogs of a modified cysteamine moiety
作者:M. Shimizu、O. Nagase、Y. Hosokawa、H. Tagawa
DOI:10.1016/s0040-4020(01)88434-9
日期:1968.1
Some coenzyme A analogs, such as α-methyl-(IVc), β-methyl-(IVd), and α-carboxy-coenzyme A (IVe), have been synthesized from the nitrile compound (Ib) and cysteamine derivatives (IIc–e) via the respective thiazoline intermediates (IIIc–e). Homo-coenzyme A (XII) has been synthesized by a combination of the methods of Moffatt and Khorana, for the formation of pyrophosphate, and Michelson, for 2′, 3′-cyclic