How is a Zinc Ion Correctly Allocated to a Zinc-dependent Protein?

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Microbial Metabolism of Metals and Metalloids

Part of the book series: Advances in Environmental Microbiology ((AEM,volume 10))

Abstract

This book chapter tries to visualize how a bacterial cell manages to bring zinc and no other transition metal cation to a zinc-dependent protein. Based upon the chemical constraints described in an introductory part of this book (“Chemical constraints for transition metal cation allocation” by author Dietrich H. Nies), a zinc allocation hypothesis was derived and tested on a theoretical level. The number of Lewis acids and bases were determined in the bacterium Cupriavidus metallidurans to define the stage. Molecular crowding and the Debye–Hückel equation describes how close the interacting Lewis bases and acids approach each other under cellular conditions. As one path for metal allocation, pre-discriminated cations may move along in the crowded areas from binding site to binding site, until “node” sites are reached that allow metal storage and discrimination by the formation of complex compounds. An inventory of motifs for such sites in C. metallidurans was derived. These may contribute to the movement of pre-discriminated ions or may be binding sites for already discriminated metals. As can be expected such motifs were found in proteins that are part of the three pillars of multiple metal homeostasis. First is the transportome, which adjusts the concentrations of metal cations and the composition of the mélange. Second is the repository, especially the zinc repository in the ribosome and RNA polymerase, which interacts with the transportome and buffers the cellular metal content. Third is a preference setting with iron first and sigma factors of the ECF (extracytoplasmic functions) family of sigma factors. This process is not completely understood at present.

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Correspondence to Dietrich H. Nies .

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Nies, D.H. (2022). How is a Zinc Ion Correctly Allocated to a Zinc-dependent Protein?. In: Hurst, C.J. (eds) Microbial Metabolism of Metals and Metalloids. Advances in Environmental Microbiology, vol 10. Springer, Cham. https://doi.org/10.1007/978-3-030-97185-4_19

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