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Updated: May 25, 2026

ECM Protein Nanofibers and Nanostructures Engineered Using Surface-initiated Assembly
Published on: April 17, 2014
Hemopressin forms self-assembled fibrillar nanostructures under physiologically relevant conditions
Martha G Bomar1, Steven J Samuelsson, Patrick Kibler
1Center for Advanced Drug Research (CADRE), SRI International , 140 Research Drive, Harrisonburg, Virginia 22802, United States.
Hemopressin, a hemoglobin-derived peptide, self-assembles into beta-like fibrils under physiological conditions. This structural insight is crucial for understanding its therapeutic potential and CB1 receptor inverse agonism.
Area of Science:
- Biochemistry
- Structural Biology
- Neuropharmacology
Background:
- Hemopressin, derived from hemoglobin's alpha chain, acts as a CB1 receptor inverse agonist.
- Hemopressin administration in animal models shows effects on food intake, blood pressure, and pain perception.
- Limited structural data exists for hemopressin, hindering structure-activity relationship studies.
Purpose of the Study:
- To investigate the conformational features of hemopressin under physiological conditions.
- To understand the structural basis for hemopressin's biological activities.
- To explore the self-assembly properties of hemopressin.
Main Methods:
- Transmission electron microscopy (TEM) to visualize self-assembly.
- Circular dichroism (CD) spectroscopy to determine secondary structure.
- Nuclear magnetic resonance (NMR) spectroscopy for detailed structural analysis.
Main Results:
- Hemopressin self-assembles into fibrils in aqueous solution at pH 7.4.
- CD and NMR data indicate a predominantly extended beta-like secondary structure.
- The observed beta-like structure is proposed to facilitate fibril formation.
Conclusions:
- Hemopressin exhibits self-assembly into beta-like fibrils under physiological conditions.
- The conformational properties of hemopressin are linked to its fibril formation.
- This study provides foundational structural insights for hemopressin's therapeutic development.
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