Background: Bacterial cluster 9 ATP binding cassette (ABC) transporters are responsible for import of Zn 2ϩ and Mn 2ϩ . Results: A solute-binding protein of the cluster 9 family is shown to preferentially bind Zn 2ϩ in an unusual coordination sphere. Conclusion: A subclass of Zn 2ϩ transporter has been identified with distinct structural properties. Significance: Cluster 9 ABC transporters are important virulence factors.
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