Host-Intracellular Bacteria Interactions

A special issue of Microorganisms (ISSN 2076-2607). This special issue belongs to the section "Molecular Microbiology and Immunology".

Deadline for manuscript submissions: closed (31 March 2022) | Viewed by 6971

Special Issue Editor


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Guest Editor
UMR ASTRE CIRAD-INRAE, Centre for Research and surveillance on Vector-borne diseases in the Caribbean, Domaine de Duclos, Prise d’eau, 97170 Petit Bourg, Guadeloupe, France
Interests: secretion systems; effectors; intracellular bacteria; interaction

Special Issue Information

Dear Colleagues,

A fundamental step for the survival and replication of intravacuolar bacterial pathogens is the establishment of a replicative niche inside host cells. This is achieved by secreting bacterial effector proteins in the cytoplasm of the infected cells by a specialised secretion systems. Bacterial effector proteins interact with 
eukaryotic proteins and genes to manipulate host signalling pathways, thus allowing the host degradative pathway to escape and the nutrients required for intracellular replication of bacteria to converge. Understanding the bacterial–host interactions that regulate these processes is therefore of prime importance to counter bacterial infections and identify candidate targets for the development of host-targeted antimicrobials, as an alternative to antibiotics. Similarly, bacterial endosymbionts also colonize their hosts by means of secreted effectors that modify cellular processes to make a cosy replicative niche and to facilitate transmission and spreading. The need to know more about symbiotic effectors is great since they help make the process of infection easier and therefore help to better control infectious diseases.

Dr. Damien F. Meyer
Guest Editor

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Keywords

  • secretion systems
  • effectors
  • intracellular bacteria
  • interaction

Published Papers (1 paper)

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Research

27 pages, 7859 KiB  
Article
Intracellular Bacteria in Plants: Elucidation of Abundant and Diverse Cytoplasmic Bacteria in Healthy Plant Cells Using In Vitro Cell and Callus Cultures
by Pious Thomas and Christopher M. M. Franco
Microorganisms 2021, 9(2), 269; https://doi.org/10.3390/microorganisms9020269 - 28 Jan 2021
Cited by 9 | Viewed by 6142
Abstract
This study was initiated to assess whether the supposedly axenic plant cell cultures harbored any cultivation-recalcitrant endophytic bacteria (CREB). Adopting live-cell imaging with bright-field, fluorescent and confocal microscopy and bacterial 16S-rRNA gene taxonomic profiling, we report the cytoplasmic association of abundant and diverse [...] Read more.
This study was initiated to assess whether the supposedly axenic plant cell cultures harbored any cultivation-recalcitrant endophytic bacteria (CREB). Adopting live-cell imaging with bright-field, fluorescent and confocal microscopy and bacterial 16S-rRNA gene taxonomic profiling, we report the cytoplasmic association of abundant and diverse CREBs in long-term actively maintained callus and cell suspension cultures of different plant species. Preliminary bright-field live-cell imaging on grape cell cultures showed abundant intracellular motile micro-particles resembling bacteria, which proved uncultivable on enriched media. Bacterial probing employing DNA stains, transmission electron microscopy, and Eubacterial FISH indicated abundant and diverse cytoplasmic bacteria. Observations on long-term maintained/freshly established callus stocks of different plant species—grapevine, barley, tobacco, Arabidopsis, and medicinal species—indicated intracellular bacteria as a common phenomenon apparently originating from field shoot tissues.Cultivation-independent 16S rRNA gene V3/V3–V4 amplicon profiling on 40-year-old grape cell/callus tissues revealed a high bacterial diversity (>250 genera), predominantly Proteobacteria, succeeded by Firmicutes, Actinobacteria, Bacteriodetes, Planctomycetes, and 20 other phyla, including several candidate phyla. PICRUSt analysis revealed diverse functional roles for the bacterial microbiome, majorly metabolic pathways. Thus, we unearth the widespread association of cultivation-recalcitrant intracellular bacteria “Cytobacts” inhabiting healthy plant cells, sharing a dynamic mutualistic association with cell hosts. Full article
(This article belongs to the Special Issue Host-Intracellular Bacteria Interactions)
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