Structure of the periplasmic binding protein MelB (Atu4661) in complex with melibiose from Agrobacterium fabrum C58

The plant defense signal galactinol is specifically used as a nutrient by the bacterial pathogenAgrobacterium fabrum.

Periplasmic alpha-galactoside-binding protein

25% PEG 4000, 0.6 M NaCl, 0.2 M CaCl2 and 0.1 M Mes pH 6.5