Molecular recognition in the P2Y14 receptor: Probing the structurally permissive terminal sugar moiety of uridine-5′-diphosphoglucose
作者:Hyojin Ko、Arijit Das、Rhonda L. Carter、Ingrid P. Fricks、Yixing Zhou、Andrei A. Ivanov、Artem Melman、Bhalchandra V. Joshi、Pavol Kováč、Jan Hajduch、Kenneth L. Kirk、T. Kendall Harden、Kenneth A. Jacobson
DOI:10.1016/j.bmc.2009.05.024
日期:2009.7
substitution by chain extension through an amide linkage. Functionalized congeners containing terminal 2-acylaminoethylamides prepared by this strategy retained P2Y14 activity, and molecular modeling predicted close proximity of this chain to the second extracellular loop of the receptor. In addition, replacement of glucose with other sugars did not diminish P2Y14 potency. For example, the [5′′]ribose derivative
Structure−Activity Relationship of (<i>N</i>)-Methanocarba Phosphonate Analogues of 5′-AMP as Cardioprotective Agents Acting Through a Cardiac P2X Receptor
作者:T. Santhosh Kumar、Si-Yuan Zhou、Bhalchandra V. Joshi、Ramachandran Balasubramanian、Tiehong Yang、Bruce T. Liang、Kenneth A. Jacobson
DOI:10.1021/jm9018542
日期:2010.3.25
P2X receptor activation protects in heart failure models. MRS2339 3, a 2-chloro-AMP derivative containing a (N)-methanocarba (bicyclo[3.1.0]hexane) system, activates this cardioprotective channel. Michaelis-Arbuzov and Wittig reactions provided phosphonate analogues of 3, expected to be stable in vivo due to the C P bond. After chronic administration via a mini-osmotic pump (Alzet), some analogues significantly increased intact heart contractile function in calsequestrin-overexpressing mice (genetic model of heart failure) compared to vehicle-infused mice (all inactive at the vasodilatory P2Y(1) receptor). Two phosphonates, (1'S,2'R,3',5,4'R,5'S)-4'-(6-amino-2-chloropurin-9-y1)-2',3'-(dihydroxy)-1'-(phosphonomethylene)-bicyclo[3.1.0]hexane, 4 (MRS2775), and its homologue 9 (MRS2935), both 5'-saturated, containing a 2-Cl substitution, improved echocardiography-derived fractional shortening (20.25% and 19.26%, respectively, versus 13.78% in controls), while unsaturated 5'-extended phosphonates, all 2-H analogues, and a CH3-phosphonate were inactive. Thus, chronic administration of nucleotidase-resistant phosphonates conferred a beneficial effect, likely via cardiac P2X receptor activation. Thus, we have greatly expanded the range of carbocyclic nucleotide analogues that represent potential candidates for the treatment of heart failure.