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How lectins translate sugar-encoded information into cellular effects not only depends on glycan recognition. Other domains of the protein can contribute to the functional profile of a lectin. Human galectin-3 (Gal-3), an adhesion/growth-regulatory galectin, is composed of three different domains and is thus called a chimera-type protein. In addition to the carbohydrate-recognition domain, this lectin encompasses an N-terminal domain consisting of a peptide harbouring two phosphorylation sites and nine non-triple-helical collagen-like repeats. This region plays an as yet structurally undefined role in Gal-3 aggregation and ligand recognition. To date, crystallization of full-length Gal-3 has not been achieved. With the aim of providing structural insights into this modular organization, a Gal-3 variant was crystallized maintaining the terminal peptide and three of the nine collagen-like repeats. The crystals belonged to the orthorhombic space group P212121, with unit-cell parameters a = 94.04, b = 97.96, c = 236.20 Å, and diffracted to a resolution of 3.3 Å.

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