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Identification of two anti-parallel beta-sheet conformations in the solution structure of murine epidermal growth
Abstract:
Epidermal growth factor (EGF) is a small mitogenic protein. Proteins with sequence homology with EGF or with its membrane-bound protein receptor have been proposed to play a role in oncogenesis. This report describes solution NMR data that provide evidence that the solution conformation of murine EGF includes an anti-parallel beta-sheet structure involving residues S2-P4, V19-I23, and S28-N32; a small anti-parallel beta-sheet involving residues Y37-S38 and T44-R45; and a multiple-bend (or short irregular helix) structure for residues C6-C14 that is disulfide bonded to the V19-I23/S28-N32 beta-sheet. Implications of these results for structure and function studies of EGF and for molecular design of EGF and homologous alpha-type transforming growth factors are discussed.
Insights
Murine epidermal growth factor (EGF) solution conformation reveals specific beta-sheet structures. These findings offer insights into EGF
Area of Science:
- Biochemistry
- Structural Biology
- Molecular Biology
Background:
- Epidermal growth factor (EGF) is a mitogenic protein implicated in oncogenesis.
- Proteins homologous to EGF or its receptor are linked to cancer development.
Purpose of the Study:
- To elucidate the solution conformation of murine EGF using Nuclear Magnetic Resonance (NMR) spectroscopy.
- To provide structural insights for understanding EGF function and designing related growth factors.
Main Methods:
- Solution Nuclear Magnetic Resonance (NMR) spectroscopy was employed to determine the three-dimensional structure of murine EGF.
- Analysis of NMR data identified specific secondary structural elements and their arrangement.
Main Results:
- The solution structure of murine EGF features an anti-parallel beta-sheet involving residues S2-P4, V19-I23, and S28-N32.
- A second, smaller anti-parallel beta-sheet was identified (residues Y37-S38 and T44-R45).
- A disulfide-bonded multiple-bend/irregular helix structure (residues C6-C14) was observed, linked to a beta-sheet.
Conclusions:
- The determined solution conformation provides a structural basis for EGF's biological activity.
- These structural findings are crucial for future studies on EGF, its receptor interactions, and the design of novel therapeutic agents targeting EGF-related pathways.