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Polymorphism of human plasma thyroxine binding prealbumin.
Biochemical and Biophysical Research Communications
|July 29, 1983
Summary
Researchers identified the first point mutation in human plasma prealbumin, a key protein in heredofamilial amyloidosis. This genetic alteration involves a methionine-for-valine substitution at position 30, impacting protein structure and function.
Area of Science:
- Biochemistry
- Genetics
- Protein Chemistry
Background:
- Heredofamilial amyloidosis is linked to amyloid fibrils composed of plasma prealbumin.
- Understanding prealbumin's structure is crucial for studying this disease.
Purpose of the Study:
- To develop a method for isolating prealbumin from plasma.
- To identify molecular differences in prealbumin from affected individuals.
Main Methods:
- A three-step purification process involving ion exchange chromatography, affinity chromatography, and gel filtration.
- Peptide mapping of trypsin digests using reverse-phase HPLC.
Main Results:
- Successfully isolated prealbumin from plasma.
- Identified a single unexpected peptide in the affected prealbumin.
- This peptide corresponds to a methionine-for-valine substitution at position 30.
Conclusions:
- The substitution at position 30 is the first identified point mutation in human plasma prealbumin.
- This mutation is present in approximately one-third of the isolated molecules.
- This finding provides insight into the molecular basis of heredofamilial amyloidosis.