Role of Unusual P Loop Ejection and Autophosphorylation in HipA-Mediated Persistence and Multidrug Tolerance

Maria A. Schumacher, Jung Ki Min, Todd M. Link, Ziqiang Guan, Weijun Xu, Young Ho Ahn, Erik J. Soderblom, Jonathan M. Kurie, Artem Evdokimov, M. Arthur Moseley, Kim Lewis, Richard G. Brennan

Research output: Contribution to journalArticlepeer-review

34 Scopus citations

Abstract

HipA is a bacterial serine/threonine protein kinase that phosphorylates targets, bringing about persistence and multidrug tolerance. Autophosphorylation of residue Ser150 is a critical regulatory mechanism of HipA function. Intriguingly, Ser150 is not located on the activation loop, as are other kinases; instead, it is in the protein core, where it forms part of the ATP-binding " P loop motif." How this buried residue is phosphorylated and regulates kinase activity is unclear. Here, we report multiple structures that reveal the P loop motif's exhibition of a remarkable " in-out" conformational equilibrium, which allows access to Ser150 and its intermolecular autophosphorylation. Phosphorylated Ser150 stabilizes the " out state," which inactivates the kinase by disrupting the ATP-binding pocket. Thus, our data reveal a mechanism of protein kinase regulation that is vital for multidrug tolerance and persistence, as kinase inactivation provides the critical first step in allowing dormant cells to revert to the growth phenotype and to reinfect the host. Bacterial multidrug tolerance (MDT) or persistence is largely responsible for the inability of antibiotics to eradicate infections and is caused by a small subpopulation of dormant cells called persisters. How reversion to a growth phenotype occurs is unknown. Schumacher and colleagues show that the key Escherichia coli persistence factor HipA, a protein kinase, undergoes a dramatic ejection of its catalytic P loop, thereby allowing its trans-autophosphorylation, which deactivates HipA. Such inactivation is a crucial early step in phenotypic reversion and MDT.

Original languageEnglish
Pages (from-to)518-525
Number of pages8
JournalCell Reports
Volume2
Issue number3
DOIs
StatePublished - 27 Sep 2012

Bibliographical note

Funding Information:
We thank the Advanced Light Source and their support staff. The ALS is supported by the Director, Office of Science, Office of Basic Energy Sciences, Materials Sciences Division, of the US Department of Energy at the Lawrence Berkeley National Laboratory. This work was supported by a U.T. M.D. Anderson Trust Fellowship and National Institutes of Health grant GM074815 (to M.A.S.) and R.A. Welch grant G0040 (to R.G.B.). K.L. is supported by National Institutes of Health grant 3R01 GM0611622-05A1.

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