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Crystallographic studies of bovine beta2-microglobulin
Summary
Bovine lactollin, a milk protein analogous to beta2-microglobulin, was crystallized. X-ray diffraction revealed its structure, confirming it exists as a single polypeptide chain in solution and crystals.
Area of Science:
- Biochemistry
- Structural Biology
- Crystallography
Background:
- Lactollin is a bovine milk protein.
- It is structurally analogous to beta2-microglobulin.
- Beta2-microglobulin is homologous to immunoglobulin constant domains and is part of major histocompatability antigens.
Purpose of the Study:
- To determine the crystal structure of bovine lactollin.
- To analyze the structural properties of lactollin in both crystalline and solution states.
Main Methods:
- X-ray diffraction of lactollin crystals.
- Analysis of unit cell parameters and physical chemical solution studies.
Main Results:
- X-ray diffraction data extended to 2.8 A resolution.
- Lactollin crystallizes in the orthorhombic space group P2(1)2(1)2(1).
- Unit cell parameters: a = 77.4, b = 47.9, c = 34.3 A.
Conclusions:
- Lactollin exists as a single polypeptide chain.
- The molecular weight of lactollin is 12,000 daltons.
- This structure is consistent in both crystal and solution states.