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Structure of micelle‐bound adrenomedullin: A first step toward the analysis of its interactions with receptors and small molecules
Author(s) -
PérezCastells Javier,
MartínSantamaría Sonsoles,
Nieto Lidia,
Ramos Ana,
Martínez Alfredo,
PascualTeresa Beatriz de,
JiménezBarbero Jesús
Publication year - 2012
Publication title -
biopolymers
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.556
H-Index - 125
eISSN - 1097-0282
pISSN - 0006-3525
DOI - 10.1002/bip.21700
Subject(s) - adrenomedullin , chemistry , small molecule , molecule , micelle , receptor , biophysics , nuclear magnetic resonance spectroscopy , computational biology , biochemistry , stereochemistry , organic chemistry , aqueous solution , biology
Adrenomedullin (AM) is a regulatory peptide which plays many physiological roles including vasodilatation, bronchodilatation, hormone secretion regulation, growth, apoptosis, angiogenesis, and antimicrobial activities, among others. These regulatory activities make AM a relevant player in the pathophysiology of important diseases such as cardiovascular and renal conditions, cancer, and diabetes. Therefore, molecules that target the AM system have been proposed as having therapeutic potential. To guide the design and characterization of such molecules, we elucidated the three‐dimensional structure of AM in a membrane mimicking medium using NMR spectroscopy methods. Under the employed experimental conditions, the structure can be described as composed by a central α‐helical region, spanning about one third of its total length, flanked by two disordered segments at both N‐ and C‐termini. The structure of AM in water is completely disordered. The 22–34 region of AM has a general tendency to adopt a helical structure under the employed experimental conditions. Furthermore, the study of the interaction of AM with two of its modulators has also been performed by using chemical shift perturbation analysis NMR methods with two‐dimensional (2D)‐TOCSY experiments, assisted with molecular modeling protocols. We expect these results will help in better understanding the interactions of AM with its receptor and binding proteins/molecules and in the development of novel modulators of AM activities. © 2011 Wiley Periodicals, Inc. Biopolymers 97: 45–53, 2012.