Abstract
The latency global regulator DosR regulon of Mycobacterium tuberculosis, which is stimulated by hypoxia, comprises approximately fifty genes including ctpF (Rv1997), which encodes a putative alkali/alkaline earth ion transporter of the plasma membrane. In this work, the influence of hypoxia and M. tuberculosis DosR on the ATPase activity of mycobacterial plasma membrane was assessed. We performed bioinformatic analyses which indicated that the pma1 gene product is the M. smegmatis ortholog of the M. tuberculosis cation transporter CtpF. In addition, a possible Na+, K+ and/or Ca2+ pumping mediated by Pma1 was also predicted. Enzymatic analyses indicated that the basal ATPase activity of plasma membrane vesicles from M. smegmatis cells cultured under hypoxia and over-expressing DosR, decreased 30 and 40 % respectively in comparison to oxygenated cells. In contrast, the specific Na+/K+ and Ca2+ ATPase activities of the plasma membrane increased 2.8- and 3.5-fold, respectively, under hypoxia, similar to that observed for cells over-expressing the DosR regulator. In agreement, RT-qPCR experiments demonstrated that the transcription level of the pma1 gene increased under hypoxia at levels similar to that of M. smegmatis cells over-expressing the M. tuberculosis DosR regulator. The entire findings suggest that hypoxia stimulates Na+/K+ and Ca2+ ATPase activities in the mycobacterial plasma membrane, and this is possibly mediated by the dormancy regulator DosR.
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Acknowledgments
This work was supported by the “División de Investigación Bogotá, DIB”, Vicerrectoría de Investigación, Universidad Nacional de Colombia, grants 15835, 14337, 14837 and 16060.
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Online Resource 1
HMM search results for the M. smegmatis mc2155 P-type ATPases. Probabilistic profiles based on hidden Markov models were constructed to identify and classify Pma1 and CtpF according to the possible ion that is pumped across the plasma membrane. The plot was constructed using the scores that were obtained using the Hmmsearch tool. Those scores show the similarity between the identified sequences in the M. smegmatis mc2155 proteome and the grouped sequences that were used for each HMM construction. The gene products of M. smegmatis pma1 and M. tuberculosis ctpF are possible alkali or alkaline/earth metal cation transporters. Both proteins, CtpF and Pma1, had the highest amino acid sequence homology to vertebrate sarcoplasmic/endoplasmic reticulum Ca2+ATPases (SERCA), and comparable homology to plasma membrane Ca2+ ATPases and Na+/K+ ATPases (DOCX 304 kb)
Online Resource 2
Hydrophobicity analyses of the M. smegmatis pma1 gene product. The amino acid sequences of M. tuberculosis CtpF and M. smegmatis Pma1 were analysed using the TMHMM 2.0 tool. Both proteins exhibited 10 transmembrane segments that were arranged into a type II topology (DOCX 55 kb)
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Pulido, P.A., Novoa-Aponte, L., Villamil, N. et al. The DosR Dormancy Regulator of Mycobacterium tuberculosis Stimulates the Na+/K+ and Ca2+ ATPase Activities in Plasma Membrane Vesicles of Mycobacteria. Curr Microbiol 69, 604–610 (2014). https://doi.org/10.1007/s00284-014-0632-6
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DOI: https://doi.org/10.1007/s00284-014-0632-6