Journal article

A Trap-Door Mechanism for Zinc Acquisition by Streptococcus pneumoniae AdcA

Zhenyao Luo, Jacqueline R Morey, Evelyne Deplazes, Alina Motygullina, Aimee Tan, Katherine Ganio, Stephanie L Neville, Nikolaos Eleftheriadis, Michael Isselstein, Victoria G Pederick, James C Paton, Thorben Cordes, Jeffrey R Harmer, Bostjan Kobe, Christopher A McDevitt



Zinc is an essential element in all domains of life. Nonetheless, how prokaryotes achieve selective acquisition of zinc from the extracellular environment remains poorly understood. Here, we elucidate a novel mechanism for zinc-binding in AdcA, a solute-binding protein of Streptococcus pneumoniae Crystal structure analyses reveal the two-domain organization of the protein and show that only the N-terminal domain (AdcAN) is necessary for zinc import. Zinc binding induces only minor changes in the global protein conformation of AdcA and stabilizes a highly mobile loop within the AdcAN domain. This loop region, which is conserved in zinc-specific solute-binding proteins, facilitates closure of ..

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