Interaction of GTP derivatives with cellular and oncogenic ras-p21 proteins
摘要:
A series of N2-substituted guanosine 5'-triphosphates was synthesized from the corresponding nucleosides. The nucleosides were prepared by treatment of N2-substituted guanines with tetra-O-acetylribose under conditions which maximized the yield of the 9-beta-guanosine isomers. These nucleotides and several sugar- and base-modified analogues of GTP were tested for their ability to bind to cellular and oncogenic forms of the GTP/GDP binding proteins, Ha-ras-p21. Several N2-substituted GTPs showed affinities higher than that of GDP itself, and the N2-[p-(n-butyl)phenyl] derivative bound to the oncogenic mutant, Leu-61 p21, twice as strongly as to the cellular protein. Changes in relative affinities of the nucleotides are discussed with reference to reported crystallographic structures of p21.
Method for treating disease or condition susceptible to amelioration by AMPK activators and compounds of formula which are useful to activate AMP-activated protein kinase (AMPK)
申请人:CHEN Han-Min
公开号:US20140303112A1
公开(公告)日:2014-10-09
The present invention relates to a method for treating disease or condition susceptible to amelioration by AMPK activators and compounds of formula which are useful to activate AMP-activated protein kinase (AMPK) and the use of the compounds in the prevention or treatment of disease, including pre-diabetes, type 2 diabetes, syndrome X, metabolic syndrome and obesity.
A series of N2-substituted guanosine 5'-triphosphates was synthesized from the corresponding nucleosides. The nucleosides were prepared by treatment of N2-substituted guanines with tetra-O-acetylribose under conditions which maximized the yield of the 9-beta-guanosine isomers. These nucleotides and several sugar- and base-modified analogues of GTP were tested for their ability to bind to cellular and oncogenic forms of the GTP/GDP binding proteins, Ha-ras-p21. Several N2-substituted GTPs showed affinities higher than that of GDP itself, and the N2-[p-(n-butyl)phenyl] derivative bound to the oncogenic mutant, Leu-61 p21, twice as strongly as to the cellular protein. Changes in relative affinities of the nucleotides are discussed with reference to reported crystallographic structures of p21.