An exposed F-type lectin domain fused to the N-terminus of a cholesterol-dependent cytolysin scaffold allows Streptococcus mitis Lectinolysin to cluster at fucose-rich sites on target cell membranes, thereby leading to increased pore-forming toxin activity. In this issue of Structure, Feil and coworkers define the structural basis for Lectinolysin glycan-binding specificity ().
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