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Published on: October 16, 2014
High level expression and crystallization of recombinant human cathepsin S
1Khepri Pharmaceuticals, Inc., South San Francisco, California 94080, USA.
Protein Science : a Publication of the Protein Society
|April 1, 1996
Summary
Researchers produced active human cathepsin S using a baculovirus system, enabling structural studies of this unique lysosomal cysteine proteinase. The enzyme
Area of Science:
- Biochemistry
- Structural Biology
- Enzymology
Background:
- Cathepsin S is a lysosomal cysteine proteinase with unique properties.
- Understanding its structure is crucial for biochemical and pharmacological research.
Purpose of the Study:
- To express active human cathepsin S in large quantities.
- To determine the crystal structure of human cathepsin S.
Main Methods:
- Expression of active human cathepsin S in Sf9 cells via a baculovirus system.
- Purification to 60 mg/L.
- Crystallization of irreversibly inhibited recombinant cathepsin S using ammonium phosphate.
- X-ray diffraction analysis.
Main Results:
- Milligram quantities of active human cathepsin S were produced.
- Crystals of cathepsin S were obtained and diffracted X-rays to 2.3 A.
- The crystals belong to the orthorhombic system with cell dimensions a = 37.7 A, b = 73.9 A, c = 106.7 A.
- One molecule per asymmetric unit is likely.
Conclusions:
- The successful expression and crystallization of human cathepsin S provide a foundation for detailed structural analysis.
- The determined structure will elucidate the unique properties of this enzyme among lysosomal cysteine proteinases.
- This work facilitates further investigation into cathepsin S function and potential therapeutic targeting.
