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Isolation and partial characterization of a glial hyaluronate-binding protein
G Perides1, W S Lane, D Andrews
1Department of Pathology, Harvard Medical School, Boston, Massachusetts.
The Journal of Biological Chemistry
|April 5, 1989
Summary
Researchers isolated a glial hyaluronate-binding protein (GHAP) from human brain white matter. This brain-specific protein shares similarities with cartilage proteins but possesses unique characteristics.
Area of Science:
- Neuroscience
- Biochemistry
- Glycobiology
Background:
- Glial hyaluronate-binding protein (GHAP) is a glycoprotein found in the brain.
- Understanding the characteristics and localization of GHAP is crucial for neurobiological research.
Purpose of the Study:
- To isolate and characterize glial hyaluronate-binding protein (GHAP) from human brain white matter.
- To investigate the protein's resistance to degradation and its distribution within the brain.
- To compare brain GHAP with known cartilage proteins.
Main Methods:
- Isolation of GHAP from human brain white matter.
- Proteolysis resistance assays.
- Immunohistochemical localization using monoclonal and polyclonal antibodies.
- Enzymatic deglycosylation.
- Amino acid sequencing and comparison with cartilage proteins.
Main Results:
- A 60-kDa GHAP was isolated from human brain white matter, showing resistance to proteolysis.
- Immunohistochemistry revealed GHAP predominantly in cerebral white matter, with minimal presence in gray matter.
- Enzymatic deglycosylation yielded a 47-kDa immunoreactive polypeptide.
- Amino acid sequences showed up to 89% similarity to cartilage proteins, but also indicated brain-specific differences.
Conclusions:
- Human brain white matter contains a unique, proteolysis-resistant GHAP.
- GHAP is localized primarily in white matter, suggesting a role in this brain region.
- Brain GHAP exhibits structural similarities to cartilage proteins but possesses distinct features, highlighting its brain-specific nature.