1P9J

Solution structure and dynamics of the EGF/TGF-alpha chimera T1E

Summary for 1P9J

• Entry DOI: 10.2210/pdb1p9j/pdb
• NMR Information: BMRB: 5801
• Descriptor: chimera of Epidermal growth factor(EGF) and Transforming growth factor alpha (TGF-alpha) (1 entity in total)
• Functional Keywords: chimera, egf, tgf-alpha, erbb1, erbb3, hormone-growth factor complex, hormone/growth factor
• Biological source: Homo sapiens (human)
• Total number of polymer chains: 1
• Total formula weight: 6339.22

Authors

Wingens, M.,Walma, T.,Van Ingen, H.,Stortelers, C.,Van Leeuwen, J.E.,Van Zoelen, E.J.,Vuister, G.W. (deposition date: 2003-05-12, release date: 2003-10-07, Last modification date: 2024-11-13)

Primary citation

Wingens, M.,Walma, T.,Van Ingen, H.,Stortelers, C.,Van Leeuwen, J.E.,Van Zoelen, E.J.,Vuister, G.W.
Structural Analysis of an Epidermal Growth Factor/Transforming Growth Factor-alpha Chimera with Unique ErbB Binding Specificity.
J.Biol.Chem., 278:39114-39123, 2003

PubMed Abstract: Various chimeras of the ErbB1-specific ligands epidermal growth factor (EGF) and transforming growth factor-alpha (TGFalpha) display an enlarged repertoire as activators of ErbB2.ErbB3 heterodimers. Mutational analysis indicated that particularly residues in the N terminus and B-loop region of these ligands are involved in the broadened receptor specificity. In order to understand the receptor specificity of T1E, a chimeric ligand constructed by the introduction of the linear N-terminal region of TGFalpha into EGF, we determined in this study the solution structure and dynamics of T1E by multidimensional NMR analysis. Subsequently, we studied the structural characteristics of T1E binding to both ErbB1 and ErbB3 by superposition modeling of its structure on the known crystal structures of ErbB3 and liganded ErbB1 complexes. The results show that the overall structure of T1E in solution is very similar to that of native EGF and TGFalpha but that its N terminus shows an extended structure that is appropriately positioned to form a triple beta-sheet with the large antiparallel beta-sheet in the B-loop region. This conformational effect of the N terminus together with the large overall flexibility of T1E, as determined by 15N NMR relaxation analysis, may be a facilitative property for its broad receptor specificity. The structural superposition models indicate that hydrophobic and electrostatic interactions of the N terminus and B-loop of T1E are particularly important for its binding to ErbB3.

PubMed: 12869572
DOI: 10.1074/jbc.M305603200

Experimental method

SOLUTION NMR