Structural Features Mediating Zinc Binding and Transfer in the AztABCD Zinc Transporter System.

ABSTRACT: Many bacteria require ATP binding cassette (ABC) transporters for the import of the essential metal zinc from limited environments. These systems rely on a periplasmic or cell-surface solute binding protein (SBP) to bind zinc with high affinity and specificity. AztABCD is one such zinc transport system recently identified in a large group of diverse bacterial species. In addition to a classical SBP (AztC), the operon also includes a periplasmic metallochaperone (AztD) shown to transfer zinc directly to AztC. Crystal structures of both proteins from Paracoccus denitrificans have been solved and suggest several structural features on each that may be important for zinc binding and transfer. Here we determine zinc binding affinity, dissociation kinetics, and transfer kinetics for several dele

SUBMITTER: Meni A 

PROVIDER: S-EPMC7463823 | biostudies-literature | 2020 Aug

REPOSITORIES: biostudies-literature