3.4.21.41	complex between the CUB1-EGF-CUB2 domains of C1r and C1s, sitting drop vapor diffusion method, in imidazole buffer at pH 8.0 with PEG 8000 as the precipitant	755267	
3.4.21.41	crystal structure analysis, PDB IDs 1APQ	732889	
3.4.21.41	hanging drop vapour diffusion method, crystal structure of two fragments from the human C1r catalytic domain, each encompassing the second complement control protein CCP2 module and the SP domain. The wild-type species has an active structure, whereas the S637A mutant is a zymogen	653898	
3.4.21.41	hanging drop vapour diffusion, crystal structure of a mutated proenzyme form of the catalytic domain of human C1r, and the serine protease domain solved and refined to 2.9 A resolution	650989	
3.4.21.41	purified recombinant isolated active catalytic region forming a dimer in a head-to-tail fashion, complex of enzyme and product, hanging drop vapour diffusion method, 15°C, mixing of 0.008 ml protein solution, containing 0.2 mg/ml protein, 20 mM Tris-HCl, pH 7.4, and 130 mM NaC, with 0.008 ml reservoir solution containing 14% w/v PEG 6000, 0.2 M NaCl, 10% v/v glycerol, and 0.1 M Tris-HCl, pH 7.4, cryoprotection of crystals in 20% glycerol, X-ray diffraction structure determination and analysis at 2.6 A resolution, molecular replacement	683889