Abstract
Vibrio vulnificus is a halophilic marine microorganism which causes gastroenteritis and primary septicaemia in humans. An important factor that determines the survival of V. vulnificus in the human body is its ability to acquire iron. VatD is a periplasmic siderophore-binding protein from V. vulnificus M2799. The current study reports the expression, purification and crystallization of VatD. Crystals of both apo VatD and a VatD-desferrioxamine B-Fe(3+) (VatD-FOB) complex were obtained. The crystal of apo VatD belonged to space group P6422, while the crystal of the VatD-FOB complex belonged to space group P21. The difference in the two crystal forms could be caused by the binding of FOB to VatD.
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