Abstract

The monofunctional enzyme 10-formyltetrahydrofolate synthetase (THFS), which is responsible for the recruitment of single carbon units from the formate pool into a variety of folate-dependent biosynthetic pathways, has been subcloned, purified, and crystallized. The crystals belong to space group P2(1), with unit cell dimensions a = 102.4 A, b = 116.5 A, c = 115.8 A, and beta = 103.5. The crystal unit cell and diffraction is consistent with an asymmetric unit consisting of the enzyme tetramer, and a specific volume of the unit cell of 2.7 A3/ Da. The crystals diffract to at least 2.3 A resolution after flash-cooling, when using a rotating anode x-ray source and an RAXIS image plate detector.

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