Host-Polarized Cell Growth in Animal Symbionts

Autor(en)
Nika Pende, Jinglan Wang, Philipp M Weber, Jolanda Verheul, Erkin Kuru, Simon K-M R Rittmann, Nikolaus Leisch, Michael S Van Nieuwenhze, Yves V Brun, Tanneke den Blaauwen, Silvia Bulgheresi
Abstrakt

To determine the fundamentals of cell growth, we must extend cell biological studies to non-model organisms. Here, we investigated the growth modes of the only two rods known to widen instead of elongating, Candidatus Thiosymbion oneisti and Thiosymbion hypermnestrae. These bacteria are attached by one pole to the surface of their respective nematode hosts. By incubating live Ca. T. oneisti and T. hypermnestrae with a peptidoglycan metabolic probe, we observed that the insertion of new cell wall starts at the poles and proceeds inward, concomitantly with FtsZ-based membrane constriction. Remarkably, in Ca. T. hypermnestrae, the proximal, animal-attached pole grows before the distal, free pole, indicating that the peptidoglycan synthesis machinery is host oriented. Immunostaining of the symbionts with an antibody against the actin homolog MreB revealed that it was arranged medially—that is, parallel to the cell long axis—throughout the symbiont life cycle. Given that depolymerization of MreB abolished newly synthesized peptidoglycan insertion and impaired divisome assembly, we conclude that MreB function is required for symbiont widening and division. In conclusion, our data invoke a reassessment of the localization and function of the bacterial actin homolog.

Organisation(en)
Department für Ökogenomik und Systembiologie
Journal
Current Biology
Band
28
Seiten
1039-1051.e5
ISSN
0960-9822
DOI
https://doi.org/10.1016/j.cub.2018.02.028
Publikationsdatum
04-2018
Publikationsstatus
Veröffentlicht
Peer-reviewed
Ja
ÖFOS 2012
106021 Meeresbiologie, 106022 Mikrobiologie
Link zum Portal
https://ucris.univie.ac.at/portal/de/publications/hostpolarized-cell-growth-in-animal-symbionts(3caa4c98-1995-44c9-92ff-71afc2192d5c).html