Efficient synthesis and biological evaluation of ω-oxygenated analogues of vitamin K2: Study of modification and structure–activity relationship of vitamin K2 metabolites
Novel omega-oxygenated vitamin K-2 analogues, which are candidates for metabolites of vitamin K-2 homologues, were efficiently synthesized and their apoptosis-inducing activity was evaluated. We revealed that some of those analogues were biologically active and the side-chain part played an important role in apoptosis-inducing activity. Our results can provide useful information to develop the structure-activity relationship of vitamin K-2 analogues for new drugs based on vitamin K. (c) 2007 Elsevier Ltd. All rights reserved.
Cytochrome P450-Dependent Catabolism of Vitamin K: ω-Hydroxylation Catalyzed by Human CYP4F2 and CYP4F11
作者:Katheryne Z. Edson、Bhagwat Prasad、Jashvant D. Unadkat、Yoshitomo Suhara、Toshio Okano、F. Peter Guengerich、Allan E. Rettie
DOI:10.1021/bi401208m
日期:2013.11.19
Vitamin K plays an essential role in many biological processes including blood clotting, maintenance of bone health, and inhibition of arterial calcification. A menaquinone form of vitamin K, MK4, is increasingly recognized for its key roles in mitochondria] electron transport, as a ligand for the nuclear receptor SXR, which controls the expression of genes involved in transport and metabolism of endo- and xenobiotics, and as a pharmacotherapeutic in the treatment of osteoporosis. Although cytochrome P450 (CYP) 4F2 activity is recognized as an important determinant of phylloquinone (K1) metabolism, the enzymes involved in menaquinone catabolism have not been studied previously. CYP4F2 and CYP4F11 were expressed and purified and found to be equally efficient as in vitro catalysts of MK4 whydroxylation. CYP4F2, but not CYP4F11, catalyzed sequential metabolism of MK4 to the wacid without apparent release of the intermediate aldehyde. The omega-alcohol could also be metabolized to the acid by microsomal NADtdependent alcohol and aldehyde dehydrogenases. LC MS/MS analysis of trypsinized human liver microsomes (using a surrogate peptide approach) revealed the mean concentrations of CYP4F2 and CYP4F11 to be 14.3 and 8.4 pmol/mg protein, respectively. Microsomal MK4 w-hydroxylation activities correlated with the CYP4F2 V433M genotype but not the CYP4F11 D446N genotype. Collectively, these data expand the lexicon of vitamin K w-hydroxylases to include the 'orphan' P450 CYP4F11 and identify a common variant, CYP4F2 (rs2108622), as a major pharmacogenetic variable influencing MK4 catabolism.
Design and synthesis of biologically active analogues of vitamin K2: Evaluation of their biological activities with cultured human cell lines
Novel omega-oxygenated vitamin K(2) analogues were efficiently synthesized and their biological activities were evaluated. Some were biologicallyactive and the side-chain played an important role in gamma-carboxylation and apoptosis-inducing activity. The results provide useful information on the structure-activity relationship of vitamin K(2) analogues for the development of new drugs.