The protein lectin from pea (Mr 49 000) crystallizes in space group I?212121 with cell dimensions a = 51 .O A, b = 61.7 A, c = 137.6 A and z = 4. The three-dimensional structure of pea lectin at 5 A resolution was determined by multiple isomorphous replacement method, The data were collected on an ARGUS multichannel diffractometer. The pea k&n molecule can be described as a dimer with approximate dimensions 85 x 55 x 40 A. The borderline between the globules appears in the three-dimensional model as a shallow groove on its surface. Both globules have two dense layers. The molecule proved to be quite similar to the dimer of concanavalin A.
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