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Rapid Generation of Amyloid from Native Proteins In vitro
Published on: December 5, 2013
alpha-L-iduronidase forms semi-crystalline spherulites with amyloid-like properties
L Ruth1, D Eisenberg, E F Neufeld
1Department of Biological Chemistry and Molecular Biology Institute, University California Los Angeles, Los Angeles, CA 90095, USA.
Researchers found that soluble human alpha-L-iduronidase can form solid, amyloid-like spherulites under specific conditions. These protein aggregates share characteristics with amyloidogenic proteins and interact with heparin.
Area of Science:
- Biochemistry
- Structural Biology
- Protein Chemistry
Background:
- Human alpha-L-iduronidase is an enzyme crucial for cellular function.
- Understanding its structure and aggregation properties is important for biological research.
- Amyloidogenic proteins are associated with various diseases.
Purpose of the Study:
- To find conditions for crystallizing human alpha-L-iduronidase.
- To characterize the aggregation behavior of human alpha-L-iduronidase.
- To investigate potential similarities between alpha-L-iduronidase aggregates and amyloid structures.
Main Methods:
- Protein crystallization trials.
- Formation and isolation of protein aggregates (spherulites).
- X-ray diffraction analysis.
- Congo red binding assays.
- Heparin interaction studies.
Main Results:
- Discovered conditions (pH 3.0-8.5, calcium or zinc salts) that induce soluble alpha-L-iduronidase to form solid spherulites.
- Characterized these spherulites as semi-crystalline protein aggregates.
- The spherulites exhibited X-ray diffraction patterns and Congo red binding, indicative of amyloid-like properties.
- Alpha-L-iduronidase demonstrated interaction with heparin, a property shared by some amyloid-forming proteins.
Conclusions:
- Soluble human alpha-L-iduronidase can form amyloid-like spherulites under specific salt and pH conditions.
- These findings suggest potential structural and functional similarities between alpha-L-iduronidase and amyloidogenic proteins.
- The interaction with heparin further supports these observed similarities.
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