Preliminary x-ray investigation of an orthorhombic crystal of hevein.

Hevein, a small protein from the latex of Hevea brasiliensis, has been crystallized by the vapor diffusion method using 2-methyl-2,4-pentanediol and CaCl2 as the precipitant agents. The crystals are orthorhombic space group P21212 with a = 21.88, b = 31.90, and c = 51.24 A and one molecule in the asymmetric unit. The crystals are quite stable to x-rays and suitable for a high resolution three-dimensional structure determination.