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It is proposed that the first event of a multistep pore formation mechanism consists of the monomeric protein attachment to the lipid bilayer. To date there is no high\u2010resolution structure of the actinoporin pore or other membrane\u2010bound form available. Here we evaluated StI:micelle complexes of variable lipid composition to look for a suitable model for NMR studies. Micelles of pure or mixed lysophospholipids and of dihexanoyl phosphatidylcholine (DHPC) were examined. The StI:DHPC micelle was found to be the best system, yielding a stable sample and good quality spectra. A comprehensive chemical shift perturbation analysis was performed to map the StI membrane recognition site in the presence of DHPC micelles. The region mapped (residues F<jats:sup>51<\/jats:sup>, R<jats:sup>52<\/jats:sup>, S<jats:sup>53<\/jats:sup> in loop 3; F<jats:sup>107<\/jats:sup>, D<jats:sup>108<\/jats:sup>, Y<jats:sup>109<\/jats:sup>, W<jats:sup>111<\/jats:sup>, Y<jats:sup>112<\/jats:sup>, W<jats:sup>115<\/jats:sup> in loop 7; Q<jats:sup>129<\/jats:sup>, Y<jats:sup>132<\/jats:sup>, D<jats:sup>134<\/jats:sup>, M<jats:sup>135<\/jats:sup>, Y<jats:sup>136<\/jats:sup>, Y<jats:sup>137<\/jats:sup>, G<jats:sup>138<\/jats:sup> in helix\u2010\u03b12) is in agreement with previously reported data, but additional residues were found to interact, especially residues V<jats:sup>81<\/jats:sup>, A<jats:sup>82<\/jats:sup>, T<jats:sup>83<\/jats:sup>, G<jats:sup>84<\/jats:sup> in loop 5, and A<jats:sup>85<\/jats:sup>, A<jats:sup>87<\/jats:sup> in strand\u2010\u03b25. Backbone dynamics measurements of StI free in solution and bound to micelles highlighted the relevance of protein flexibility for membrane binding and suggested that a conformer selection process may take place during protein\u2013membrane interaction. We conclude that the StI:DHPC micelles system is a suitable model for further characterization of an actinoporin membrane\u2010bound form by solution NMR. Proteins 2014; 82:1022\u20131034. \u00a9 2013 Wiley Periodicals, Inc.<\/jats:p>","DOI":"10.1002\/prot.24475","type":"journal-article","created":{"date-parts":[[2013,11,12]],"date-time":"2013-11-12T06:50:57Z","timestamp":1384239057000},"page":"1022-1034","source":"Crossref","is-referenced-by-count":8,"title":["Solution NMR analysis of the interaction between the actinoporin Sticholysin I and DHPC micelles\u2014Correlation with backbone dynamics"],"prefix":"10.1002","volume":"82","author":[{"given":"Aracelys","family":"L\u00f3pez\u2010Castilla","sequence":"first","affiliation":[{"name":"Centro de Estudio de Proteinas Facultad de Biologia Universidad de la Habana Habana Cuba"},{"name":"Instituto de Bioqu\u00edmica M\u00e9dica Leopoldo de Meis Universidade Federal do Rio de Janeiro  RJ Brazil"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Fabiola","family":"Pazos","sequence":"additional","affiliation":[{"name":"Centro de Estudio de Proteinas Facultad de Biologia 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