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The Heme-Based Oxygen-Sensor Phosphodiesterase Ec DOS (DosP): Structure-Function Relationships
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The DosS-DosT/DosR Mycobacterial Sensor System

Department of Pharmaceutical Chemistry, School of Pharmacy, University of California, San Francisco, CA 94158, USA
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Biosensors 2013, 3(3), 259-282; https://doi.org/10.3390/bios3030259
Received: 21 May 2013 / Revised: 15 June 2013 / Accepted: 26 June 2013 / Published: 4 July 2013
(This article belongs to the Special Issue Physiological Sensors of Gases, Light, Redox State and Hypoxia)
DosS/DosR is a two-component regulatory system in which DosS, a heme-containing sensor also known as DevS, under certain conditions undergoes autophosphorylation and then transfers the phosphate to DosR, a DNA-binding protein that controls the entry of Mycobacterium tuberculosis and other mycobacteria into a latent, dormant state. DosT, a second sensor closely related to DosS, is present in M. tuberculosis and participates in the control of the dormancy response mediated by DosR. The binding of phosphorylated DosR to DNA initiates the expression of approximately fifty dormancy-linked genes. DosT is accepted to be a gas sensor that is activated in the ferrous state by the absence of an oxygen ligand or by the binding of NO or CO. DosS functions in a similar fashion as a gas sensor, but contradictory evidence has led to the suggestion that it also functions as a redox state sensor. This review focuses on the structure, biophysical properties, and function of the DosS/DosT heme sensors. View Full-Text
Keywords: DevS; DosS; DosT; DosR; Mycobacterium tuberculosis; heme-based sensors; two-component system; nitric oxide; carbon monoxide; hypoxia; dormancy DevS; DosS; DosT; DosR; Mycobacterium tuberculosis; heme-based sensors; two-component system; nitric oxide; carbon monoxide; hypoxia; dormancy
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Sivaramakrishnan, S.; Ortiz de Montellano, P.R. The DosS-DosT/DosR Mycobacterial Sensor System. Biosensors 2013, 3, 259-282.

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