ExoS/ChvI Two-Component Signal-Transduction System Activated in the Absence of Bacterial Phosphatidylcholine

Geiger O, Sohlenkamp C, Vera-Cruz D, Medeot DB, Martinez-Aguilar L, Sahonero-Canavesi DX, Weidner S, Pühler A, Lopez-Lara IM (2021)
Frontiers in Plant Science 12: 678976.

Zeitschriftenaufsatz | Veröffentlicht | Englisch
 
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Geiger, Otto; Sohlenkamp, Christian; Vera-Cruz, Diana; Medeot, Daniela B; Martinez-Aguilar, Lourdes; Sahonero-Canavesi, Diana X; Weidner, StefanUniBi; Pühler, AlfredUniBi ; Lopez-Lara, Isabel M
Abstract / Bemerkung
Sinorhizobium meliloti contains the negatively charged phosphatidylglycerol and cardiolipin as well as the zwitterionic phosphatidylethanolamine (PE) and phosphatidylcholine (PC) as major membrane phospholipids. In previous studies we had isolated S. meliloti mutants that lack PE or PC. Although mutants deficient in PE are able to form nitrogen-fixing nodules on alfalfa host plants, mutants lacking PC cannot sustain development of any nodules on host roots. Transcript profiles of mutants unable to form PE or PC are distinct; they differ from each other and they are different from the wild type profile. For example, a PC-deficient mutant of S. meliloti shows an increase of transcripts that encode enzymes required for succinoglycan biosynthesis and a decrease of transcripts required for flagellum formation. Indeed, a PC-deficient mutant is unable to swim and overproduces succinoglycan. Some suppressor mutants, that regain swimming and form normal levels of succinoglycan, are altered in the ExoS sensor. Our findings suggest that the lack of PC in the sinorhizobial membrane activates the ExoS/ChvI two-component regulatory system. ExoS/ChvI constitute a molecular switch in S. meliloti for changing from a free-living to a symbiotic life style. The periplasmic repressor protein ExoR controls ExoS/ChvI function and it is thought that proteolytic ExoR degradation would relieve repression of ExoS/ChvI thereby switching on this system. However, as ExoR levels are similar in wild type, PC-deficient mutant and suppressor mutants, we propose that lack of PC in the bacterial membrane provokes directly a conformational change of the ExoS sensor and thereby activation of the ExoS/ChvI two-component system. Copyright © 2021 Geiger, Sohlenkamp, Vera-Cruz, Medeot, Martinez-Aguilar, Sahonero-Canavesi, Weidner, Puhler and Lopez-Lara.
Erscheinungsjahr
2021
Zeitschriftentitel
Frontiers in Plant Science
Band
12
Art.-Nr.
678976
eISSN
1664-462X
Page URI
https://pub.uni-bielefeld.de/record/2956909

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Geiger O, Sohlenkamp C, Vera-Cruz D, et al. ExoS/ChvI Two-Component Signal-Transduction System Activated in the Absence of Bacterial Phosphatidylcholine. Frontiers in Plant Science. 2021;12: 678976.
Geiger, O., Sohlenkamp, C., Vera-Cruz, D., Medeot, D. B., Martinez-Aguilar, L., Sahonero-Canavesi, D. X., Weidner, S., et al. (2021). ExoS/ChvI Two-Component Signal-Transduction System Activated in the Absence of Bacterial Phosphatidylcholine. Frontiers in Plant Science, 12, 678976. https://doi.org/10.3389/fpls.2021.678976
Geiger, O., Sohlenkamp, C., Vera-Cruz, D., Medeot, D. B., Martinez-Aguilar, L., Sahonero-Canavesi, D. X., Weidner, S., Pühler, A., and Lopez-Lara, I. M. (2021). ExoS/ChvI Two-Component Signal-Transduction System Activated in the Absence of Bacterial Phosphatidylcholine. Frontiers in Plant Science 12:678976.
Geiger, O., et al., 2021. ExoS/ChvI Two-Component Signal-Transduction System Activated in the Absence of Bacterial Phosphatidylcholine. Frontiers in Plant Science, 12: 678976.
O. Geiger, et al., “ExoS/ChvI Two-Component Signal-Transduction System Activated in the Absence of Bacterial Phosphatidylcholine”, Frontiers in Plant Science, vol. 12, 2021, : 678976.
Geiger, O., Sohlenkamp, C., Vera-Cruz, D., Medeot, D.B., Martinez-Aguilar, L., Sahonero-Canavesi, D.X., Weidner, S., Pühler, A., Lopez-Lara, I.M.: ExoS/ChvI Two-Component Signal-Transduction System Activated in the Absence of Bacterial Phosphatidylcholine. Frontiers in Plant Science. 12, : 678976 (2021).
Geiger, Otto, Sohlenkamp, Christian, Vera-Cruz, Diana, Medeot, Daniela B, Martinez-Aguilar, Lourdes, Sahonero-Canavesi, Diana X, Weidner, Stefan, Pühler, Alfred, and Lopez-Lara, Isabel M. “ExoS/ChvI Two-Component Signal-Transduction System Activated in the Absence of Bacterial Phosphatidylcholine”. Frontiers in Plant Science 12 (2021): 678976.
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2021-09-07T06:27:29Z
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