title: Solution structure of betacellulin, a new member of EGF-family ligands.
abstract: The solution structure of the EGF-like domain of betacellulin (BTCe), a newly discovered member of the epidermal growth factor (EGF) family, has been determined using two-dimensional nuclear magnetic resonance spectroscopy. This is the first report to identify the solution structure of the EGF-family ligand monomers that interact with both ErbB-1 and ErbB-4. The solution structure of BTCe was calculated using 538 NMR-derived restraints. The overall structure of BTCe was stabilized by three disulfide bonds, a hydrophobic core, and 23 hydrogen bonds. It appears that BTCe is comprised of five beta-strands and one short 3(10) helical turn. The secondary structural elements of BTCe are basically similar to those of the other EGF-family proteins, except that several significant variations of the structural properties were found. It is suggested that the structural variations between BTCe and the other EGF-family ligands may affect the specific receptor-recognition properties of EGF-family ligands.
authors.affiliation: Bio-oriented Technology Research Advancement Institution, 1-40-2 Nisshin, Saitama, Saitama 331-8537, Japan.
authors.forename: Kazunori
authors.initials: K
authors.lastname: Miura
authors.forename: Hideki
authors.initials: H
authors.lastname: Doura
authors.forename: Tomoyasu
authors.initials: T
authors.lastname: Aizawa
authors.forename: Hiroko
authors.initials: H
authors.lastname: Tada
authors.forename: Masaharu
authors.initials: M
authors.lastname: Seno
authors.forename: Hidenori
authors.initials: H
authors.lastname: Yamada
authors.forename: Keiichi
authors.initials: K
authors.lastname: Kawano
mesh_terms: D000595:Amino Acid Sequence; D000818:Animals; D066259:Betacellulin; D004815:Epidermal Growth Factor / Q000737:chemistry; D006133:Growth Substances / Q000737:chemistry*; D006801:Humans; D036341:Intercellular Signaling Peptides and Proteins; D008024:Ligands; D051379:Mice; D008958:Models, Molecular; D008969:Molecular Sequence Data; D019906:Nuclear Magnetic Resonance, Biomolecular; D017434:Protein Structure, Tertiary; D055672:Static Electricity
chemical_list: C587851:BTC protein, human; D066259:Betacellulin; C587852:Btc protein, mouse; D006133:Growth Substances; D036341:Intercellular Signaling Peptides and Proteins; D008024:Ligands; D004815:Epidermal Growth Factor