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Characterization and crystallization of recombinant human cathepsin L
T Nomura1, A Fujishima, Y Fujisawa
1Molecular Pharmacology Laboratory, Takeda Chemical Industries, Ltd., Osaka, Japan.
Biochemical and Biophysical Research Communications
|November 21, 1996
Summary
Researchers purified human procathepsin L and converted it to its mature form. They discovered distinct properties of mature cathepsin L and successfully crystallized it, providing insights into its structure.
Area of Science:
- Biochemistry
- Structural Biology
- Enzymology
Background:
- Human procathepsin L is a key enzyme in various biological processes.
- Understanding the structure and properties of mature cathepsin L is crucial for its functional studies.
Purpose of the Study:
- To highly purify mature human cathepsin L.
- To characterize the properties of the purified mature human cathepsin L.
- To obtain crystals of mature human cathepsin L for structural analysis.
Main Methods:
- Purification of human procathepsin L from transformed mouse myeloma cell culture filtrate.
- Acidic conversion of procathepsin L to its mature form.
- Crystallization of mature human cathepsin L using polyethylene glycol 6000 and E-64.
Main Results:
- Successfully purified 25mg of human procathepsin L, yielding 18mg of the mature form.
- Identified unique properties of the mature human cathepsin L compared to the liver-derived enzyme.
- Produced the first crystals of mature human cathepsin L, determined to be orthorhombic with space group P2(1)2(1)2(1).
Conclusions:
- Mature human cathepsin L exhibits distinct biochemical properties.
- The successful crystallization provides a foundation for future X-ray crystallographic studies.
- The crystallographic data indicate one molecule of enzyme per asymmetric unit.