Abstract:
:Recently, we have demonstrated that N-((trans)-4-(2-(7-cyano-3,4-dihydroisoquinolin-2(1H)-yl)ethyl)cyclohexyl)-1H-indole-2-carboxamide (SB269652) (1) adopts a bitopic pose at one protomer of a dopamine D2 receptor (D2R) dimer to negatively modulate the binding of dopamine at the other protomer. The 1H-indole-2-carboxamide moiety of 1 extends into a secondary pocket between the extracellular ends of TM2 and TM7 within the D2R protomer. To target this putative allosteric site, we generated and characterized fragments that include and extend from the 1H-indole-2-carboxamide moiety of 1. N-Isopropyl-1H-indole-2-carboxamide (3) displayed allosteric pharmacology and sensitivity to mutations of the same residues at the top of TM2 as was observed for 1. Using 3 as an "allosteric lead", we designed and synthesized an extensive fragment library to generate novel SAR and identify N-butyl-1H-indole-2-carboxamide (11d), which displayed both increased negative cooperativity and affinity for the D2R. These data illustrate that fragmentation of extended compounds can expose fragments with purely allosteric pharmacology.
journal_name
J Med Chemjournal_title
Journal of medicinal chemistryauthors
Mistry SN,Shonberg J,Draper-Joyce CJ,Klein Herenbrink C,Michino M,Shi L,Christopoulos A,Capuano B,Scammells PJ,Lane JRdoi
10.1021/acs.jmedchem.5b00585subject
Has Abstractpub_date
2015-09-10 00:00:00pages
6819-43issue
17eissn
0022-2623issn
1520-4804journal_volume
58pub_type
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