Novel p-arylthio cinnamides as antagonists of leukocyte function-associated antigen-1/intracellular adhesion molecule-1 interaction. 2. Mechanism of inhibition and structure-based improvement of pharmaceutical properties.

Abstract:

:The interaction between leukocyte function-associated antigen-1 (LFA-1) and intracellular adhesion molecule-1 (ICAM-1) has been implicated in inflammatory and immune diseases. Recently, a novel series of p-arylthio cinnamides has been described as potent antagonists of the LFA-1/ICAM-1 interaction. These compounds were found to bind to the I domain of LFA-1 using two-dimensional NMR spectroscopy of 15N-labeled LFA-1 I domain. On the basis of NOE studies between compound 1 and the I domain of LFA-1, a model of the complex was constructed. This model revealed that compound 1 does not directly inhibit ICAM-1 binding by interacting with the metal ion dependent adhesion site (MIDAS). Instead, it binds to the previously proposed I domain allosteric site (IDAS) of LFA-1 and likely modulates the activation of LFA-1 through its interaction with this regulatory site. A fragment-based NMR screening strategy was applied to identify small, more water-soluble ligands that bind to a specific region of the IDAS. When incorporated into the parent cinnamide template, the resulting analogues exhibited increased aqueous solubility and improved pharmacokinetic profiles in rats, demonstrating the power of this NMR-based screening approach for rapidly modifying high-affinity ligands.

journal_name

J Med Chem

authors

Liu G,Huth JR,Olejniczak ET,Mendoza R,DeVries P,Leitza S,Reilly EB,Okasinski GF,Fesik SW,von Geldern TW

doi

10.1021/jm000503f

keywords:

subject

Has Abstract

pub_date

2001-04-12 00:00:00

pages

1202-10

issue

8

eissn

0022-2623

issn

1520-4804

pii

jm000503f

journal_volume

44

pub_type

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