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Expression and structural characterization of the recombinant human doppel protein
1Institute of Pathology and Mass Spectrometry Core Facility, Case Western Reserve University, 2085 Adelbert Road, Cleveland, Ohio 44106, USA.
Biochemistry
|November 7, 2000
Summary
The doppel protein (Dpl) is a prion protein-like molecule. Researchers characterized recombinant human Dpl, finding it stable, alpha-helical, and similar to PrP, aiding neurodegenerative disease research.
Area of Science:
- Biochemistry
- Molecular Biology
- Neuroscience
Background:
- The doppel protein (Dpl) is a novel prion protein (PrP)-like molecule.
- Dpl is encoded by the prnd gene, located near the PrP gene.
Purpose of the Study:
- To investigate the structural and biochemical properties of recombinant human Dpl.
- To compare the characteristics of Dpl with those of PrP.
Main Methods:
- Expression of recombinant human Dpl (residues 24-152) in E. coli.
- Characterization using gel electrophoresis, Edman sequencing, mass spectrometry (MALDI-TOF, ESI).
- Secondary structure analysis via far-UV circular dichroism spectroscopy; thermal denaturation studies.
Main Results:
- Recombinant Dpl 24-152 contains two disulfide bonds (Cys94-Cys145 and Cys108-Cys140).
- Dpl 24-152 is an alpha-helical protein (40% helical content) and is thermodynamically stable.
- Dpl 24-152 is soluble, sensitive to proteinase K, and exhibits biochemical properties akin to recombinant PrP.
Conclusions:
- Human Dpl shares biochemical similarities with PrP.
- Understanding Dpl's molecular features is crucial for future research on its function and role in neurodegenerative diseases.