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• W2045138321 abstract "Epidermal growth factor (EGF) and transforming growth factor (TGF)-alpha are potent activators of the ErbB-1 receptor, but, unlike TGF-alpha, EGF is also a weak activator of ErbB-2/ErbB-3 heterodimers. To understand the specificity of EGF-like growth factors for binding to distinct ErbB members, we used EGF/TGF-alpha chimeras to examine the requirements for ErbB-2/ErbB-3 activation. Here we show that in contrast to these two wild-type ligands, distinct EGF/TGF-alpha chimeras are potent activators of ErbB-2/ErbB-3 heterodimers. On the basis of differences in the potency of these various chimeras, specific residues in the linear N-terminal region and the so-called B-loop of these ligands were identified to be involved in interaction with ErbB-2/ErbB-3. A chimera consisting of human EGF sequences with the linear N-terminal region of human TGF-alpha was found to be almost as potent as the natural ligand neuregulin (NRG)-1beta in activating 32D cells expressing ErbB-2/ErbB-3 and human breast cancer cells. Binding studies revealed that this chimera, designated T1E, has high affinity for ErbB-2/ErbB-3 heterodimers, but not for ErbB-3 alone. Subsequent exchange studies revealed that introduction of both His2 and Phe3 into the linear N-terminal region was already sufficient to make EGF a potent activator of ErbB-2/ErbB-3 heterodimers, indicating that these two amino acids contribute positively to this receptor binding. Analysis of the B-loop revealed that Leu26 in EGF facilitates interaction with ErbB-2/ErbB-3 heterodimers, while the equivalent Glu residue in TGF-alpha impairs binding. Since all EGF/TGF-alpha chimeras tested have maintained high binding affinity for ErbB-1, it is concluded that the diversity of the ErbB signaling network is determined by specific amino acids that facilitate binding to one receptor member, in addition to residues that impede binding to other ErbB family members." @default.
• W2045138321 created "2016-06-24" @default.
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• W2045138321 date "2002-03-05" @default.
• W2045138321 modified "2023-09-24" @default.
• W2045138321 title "Epidermal Growth Factor Contains Both Positive and Negative Determinants for Interaction with ErbB-2/ErbB-3 Heterodimers" @default.
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• W2045138321 doi "https://doi.org/10.1021/bi012016n" @default.
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