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Structure of pentameric human serum amyloid P component
J Emsley1, H E White, B P O'Hara
1Laboratory of Molecular Biology, Birkbeck College, London, UK.
Nature
|January 27, 1994
Summary
The first high-resolution structure of pentameric human serum amyloid P component reveals its fold resembles legume lectins. This finding clarifies how DNA and amyloid fibrils likely bind to this important protein.
Area of Science:
- Biochemistry
- Structural Biology
- Biophysics
Background:
- Human serum amyloid P component (SAP) is a pentraxin protein implicated in amyloid diseases.
- Understanding SAP's structure is crucial for elucidating its biological functions and interactions.
Purpose of the Study:
- To determine the high-resolution three-dimensional structure of pentameric human serum amyloid P component.
- To investigate the binding mechanisms of biologically relevant ligands like DNA and amyloid fibrils.
Main Methods:
- X-ray crystallography was employed to resolve the protein's structure.
- Analysis of ligand-protein interactions, including carboxylate and phosphate binding.
Main Results:
- The study reports the first high-resolution structure of pentameric human SAP.
- The tertiary fold is highly similar to legume lectins.
- Identified binding sites for carboxylate and phosphate compounds via calcium ions, with specific amino acid ligand involvement (Asn 59, Gln 148).
Conclusions:
- The determined structure provides insights into the probable binding modes of DNA and amyloid fibrils to SAP.
- This structural information can inform the development of therapeutic strategies targeting SAP-related amyloidosis.