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. 1997 Mar;6(3):717–721. doi: 10.1002/pro.5560060321

Expression, crystallization, and preliminary X-ray analysis of a sialic acid-binding fragment of sialoadhesin in the presence and absence of ligand.

A P May 1, R C Robinson 1, R T Aplin 1, P Bradfield 1, P R Crocker 1, E Y Jones 1
PMCID: PMC2143683  PMID: 9070454

Abstract

Sialoadhesin is a macrophage-restricted cell surface receptor, consisting of 17 immunoglobulin domains, which mediates cell adhesion via the recognition of specific sialylated glycoconjugates. A functional fragment of sialoadhesin, comprising the N-terminal immunoglobulin domain, has been expressed in Chinese hamster ovary cells as both native (SnD1) and selenomethionyl (Se-SnD1) stop protein. The successful production of 86% selenomethionine-incorporated protein represents a rare example of production of selenium-labeled protein in mammalian cells. SnD1 and Se-SnD1 have been crystallized in the absence of ligand, and SnD1 has also been crystallized in the presence of its ligand 2,3 sialyllactose. The ligand-free crystals of SnD1 and Se-SnD1 were isomorphous, of space group P3(1)21 or P3(2)21, with unit cell dimensions a = b 38.9 A,c = 152.6 A, alpha = beta = 90 degrees, gamma = 120 degrees, and diffracted to a maximum resolution of 2.6 A. Cocrystals containing 2,3 sialyllactose diffracted to 1.85 A at a synchrotron source and belong to space group P2(1)2(1)2(1), with unit cell dimensions a = 40.9 A, b = 97.6 A,c = 101.6 A, alpha = beta = gamma = 90 degrees.

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Selected References

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