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Maackia Amurensis Seed Lectin Structure And Sequence Comparison With Other M. Amurensis Lectins, Ashok R. Nayak, Cayla J. Holdcraft, Ariel C. Yin, Rachel E. Nicoletto, Caifeng Zhao, Haiyan Zheng, Dmitry Temiakov, Gary S. Goldberg

Department of Biochemistry and Molecular Biology Faculty Papers

Maackia amurensis lectins, including MASL, MAA, and MAL2, are widely utilized in biochemical and medicinal research. However, the structural and functional differences between these lectins have not been defined. Here, we present a high-resolution cryo-EM structure of MASL revealing that its tetrameric assembly is directed by two intersubunit disulfide bridges. These bridges, formed by C272 residues, are central to the dimer-of-dimers assembly of a MASL tetramer. This cryo-EM structure also identifies residues involved in stabilizing the dimer interface, multiple glycosylation sites, and calcium and manganese atoms in the sugar-binding pockets of MASL. Notably, our analysis reveals that Y250 in the …