Abstract:
A new crystal form of papain from the latex of Carica papaya, complexed with an inhibitor (Z-Arg-Leu-Val-Gly-CHN2) was obtained by the vapor-diffusion method using a methanol/ethanol mixture as a precipitant. The slat-like crystals are monoclinic, space group P2(1), with unit cell parameters a = 42.6 Angstrom, b = 49.8 Angstrom, c = 50.5 Angstrom, beta = 111.9 degrees, and contain one molecule in the asymmetric unit. The crystals are stable in the X-ray beam and diffract beyond 1.8 Angstrom. A molecular model has been placed in the unit cell by molecular replacement.
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