Abstract:
:The sea anemone peptide APETx2 is a potent and selective blocker of acid-sensing ion channel 3 (ASIC3). APETx2 is analgesic in a variety of rodent pain models, but the lack of knowledge of its pharmacophore and binding site on ASIC3 has impeded development of improved analogues. Here we present a detailed structure-activity relationship study of APETx2. Determination of a high-resolution structure of APETx2 combined with scanning mutagenesis revealed a cluster of aromatic and basic residues that mediate its interaction with ASIC3. We show that APETx2 also inhibits the off-target hERG channel by reducing the maximal current amplitude and shifting the voltage dependence of activation to more positive potentials. Electrophysiological screening of selected APETx2 mutants revealed partial overlap between the surfaces on APETx2 that mediate its interaction with ASIC3 and hERG. Characterization of the molecular basis of these interactions is an important first step toward the rational design of more selective APETx2 analogues.
journal_name
J Med Chemjournal_title
Journal of medicinal chemistryauthors
Jensen JE,Cristofori-Armstrong B,Anangi R,Rosengren KJ,Lau CH,Mobli M,Brust A,Alewood PF,King GF,Rash LDdoi
10.1021/jm501400psubject
Has Abstractpub_date
2014-11-13 00:00:00pages
9195-203issue
21eissn
0022-2623issn
1520-4804journal_volume
57pub_type
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