Acta Crystallographica Section D

Biological Crystallography

Volume 58, Part 9 (September 2002)

crystallization papers

Acta Cryst. (2002). D58, 1507-1510 [ doi:10.1107/S0907444902011885 ]

Crystallization and preliminary X-ray study of recombinant betaine-homocysteine S-methyltransferase from rat liver

B. González, M. A. Pajares, H.-P. Too, F. Garrido, T. L. Blundell and J. Sanz-Aparicio

Abstract: Betaine-homocysteine S-methyltransferase is one of the three enzymes involved in homocysteine catabolism. It uses betaine as the methyl donor to convert homocysteine into methionine, also producing dimethylglycine. Recombinant BHMT from rat liver was crystallized by the vapour-diffusion method in both native and seleniomethionyl-labelled forms. Crystals belong to space group P2₁, with unit-cell parameters a = 57.8, b = 149.3, c = 96.2 Å, [beta] = 92.9°. Data from native, seleniomethionine-labelled and two heavy-atom derivatives were collected using synchrotron sources. Self-rotation function and sedimentation-velocity experiments suggest that the enzyme is tetrameric with 222 symmetry.

Keywords: betaine-homocysteine S-methyltransferase.