A Cell Cycle Kinase with Tandem Sensory PAS Domains Integrates Cell Fate Cues

Overview

Journal Nat Commun

Specialty Biology

Date 2016 Apr 28

PMID 27117914

Citations 34

Authors

Thomas H Mann

W Seth Childers

Jimmy A Blair

Michael R Eckart

Lucy Shapiro

Affiliations

Soon will be listed here.

Abstract

All cells must integrate sensory information to coordinate developmental events in space and time. The bacterium Caulobacter crescentus uses two-component phospho-signalling to regulate spatially distinct cell cycle events through the master regulator CtrA. Here, we report that CckA, the histidine kinase upstream of CtrA, employs a tandem-PAS domain sensor to integrate two distinct spatiotemporal signals. Using CckA reconstituted on liposomes, we show that one PAS domain modulates kinase activity in a CckA density-dependent manner, mimicking the stimulation of CckA kinase activity that occurs on its transition from diffuse to densely packed at the cell poles. The second PAS domain interacts with the asymmetrically partitioned second messenger cyclic-di-GMP, inhibiting kinase activity while stimulating phosphatase activity, consistent with the selective inactivation of CtrA in the incipient stalked cell compartment. The integration of these spatially and temporally regulated signalling events within a single signalling receptor enables robust orchestration of cell-type-specific gene regulation.

Citing Articles

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