Cloning, expression, purification, crystallization and X-ray crystallographic analysis of Rv2606c from Mycobacterium tuberculosis H37Rv

摘要

Tuberculosis is a widespread and deadly infectious disease, and one third of the human population is already infected. Vitamin B-6 is known to be synthesized through consecutive reactions mediated by pyridoxal biosynthesis lyase (PdxS) and glutamine amidotransferase (PdxT). The gene product Rv2606c, the PdxS pyridoxal biosynthesis lyase from Mycobacterium tuberculosis, was crystallized using the hanging-drop vapour-diffusion method in the presence of 8%(w/v) PEG 8000, 0.1 M 3-(cyclohexylamino)-1-propanesulfonic acid pH 10.5 and 0.2 M sodium chloride at 295 K. X-ray diffraction data were collected to a maximum resolution of 1.7 angstrom on a synchrotron beamline. The crystal belonged to space group I222 or I2(1)2(1)2(1), with unit-cell parameters a = 110.75, b = 126.08, c = 180.82 angstrom, alpha = beta = gamma = 90 degrees. With three molecules per asymmetric unit, the crystal volume per unit protein weight (V-M) was 3.79 angstrom(3) Da(-1).