Low-resolution X-ray diffraction data obtained from hexagonal crystals of methylamine-treated α₂-macroglobulin

Two hexagonal crystal forms of tetrameric human methylamine-treated α₂-macroglobulin have been grown by vapour diffusion. One of the crystal forms diffracts X-rays beyond 9 Å resolution. The space group of this form is P6(2)22 or P6(4)22 with a = b = 327, c = 219 Å and with one dimer of α₂-macroglobulin in the asymmetric unit. Several data sets have been collected by the use of synchrotron radiation at cryogenic temperature. A native data set extending to 10 Å resolution has been obtained. The merging R factor of these data is 10.3%.