What is it about?
This work uncovers an intramolecular GTPase activation mechanism of a G-protein on-off "switch" that becomes important under conditions of transition metal starvation. We present a testable biochemical model that describes how GTP hydrolysis in this G-protein metallochaperone is coupled to metal binding and "movement" to one or more acceptor "client" enzyme(s) via remodeling of a protein-protein interface.
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Why is it important?
The subject of this work is the COG0523 superfamily of small GTPases, conserved from bacteria to lower eukaryotes, plants and man. Although discovered more than 15 years ago, their structures, functions and mechanism of action remain poorly understood. This work presents a consensus mechanistic model that provides considerable new insights into the how a COG0523-family metallochaperone functions.
Perspectives
A "black box" becomes ever so slightly less so!! This work motivates the "client hunt" so as to enable to reconstitution and exploration of a complete metallochaperone system. This provides an unprecedented opportunity to examine G-domain switching with an inorganic twist, which promises to uncover new details about one of nature's most important molecular switches.
David Giedroc
Indiana University Bloomington
Read the Original
This page is a summary of: Self-activation by a C-terminal domain arginine finger regulates GTP hydrolysis in bacterial zinc metallochaperones, Proceedings of the National Academy of Sciences, June 2026, Proceedings of the National Academy of Sciences,
DOI: 10.1073/pnas.2608072123.
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