Abstract
In the seeds of legume plants a class of sugar-binding proteins can be found, generally called legume lectins. In this paper we present the crystallization of phytohemagglutinin-L (PHA-L), a glycosylated lectin from the seeds of the common bean (Phaseolus vulgaris). Single PHA-L crystals were grown by vapor diffusion, using PEG as precipitant. The protein crystallizes in the monoclinic space group C2, and diffracts to a resolution of 2.7 angstroms. The unit cell parameters are a=106.3 angstroms, 121.2 angstroms, c=90.8 angstroms, and beta=93.7 degrees. The asymmetric unit probably contains one PHA-L tetramer. Crystals of a recombinant nonglycosylated form of PHA-L, grown under identical conditions, and crystals of the native PHA-L, grown in the presence of isopropanol, did not survive the mounting process.
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