Expression, purification, crystallization and preliminary X-ray diffraction studies of human cathepsin F complexed with an irreversible vinyl sulfone inhibitor.

Cathepsin F is a cysteine protease believed to be involved in the antigen-presenting process of the class II major histocompatibility complex (MHC-II) in macrophages. It has been expressed, purified and crystallized. A complete data set to a resolution of 2.5 A has been collected at room temperature. The Laue group was determined to be orthorhombic, space group P2(1)2(1)2, with unit-cell parameters a = 68.9, b = 104.8, c = 68.5 A.