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2017 ; 8
(ä): 14853
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Determining the bacterial cell biology of Planctomycetes
#MMPMID28393831
Boedeker C
; Schüler M
; Reintjes G
; Jeske O
; van Teeseling MC
; Jogler M
; Rast P
; Borchert D
; Devos DP
; Kucklick M
; Schaffer M
; Kolter R
; van Niftrik L
; Engelmann S
; Amann R
; Rohde M
; Engelhardt H
; Jogler C
Nat Commun
2017[Apr]; 8
(ä): 14853
PMID28393831
show ga
Bacteria of the phylum Planctomycetes have been previously reported to possess
several features that are typical of eukaryotes, such as cytosolic
compartmentalization and endocytosis-like macromolecule uptake. However, recent
evidence points towards a Gram-negative cell plan for Planctomycetes, although
in-depth experimental analysis has been hampered by insufficient genetic tools.
Here we develop methods for expression of fluorescent proteins and for gene
deletion in a model planctomycete, Planctopirus limnophila, to analyse its cell
organization in detail. Super-resolution light microscopy of mutants,
cryo-electron tomography, bioinformatic predictions and proteomic analyses
support an altered Gram-negative cell plan for Planctomycetes, including a
defined outer membrane, a periplasmic space that can be greatly enlarged and
convoluted, and an energized cytoplasmic membrane. These conclusions are further
supported by experiments performed with two other Planctomycetes, Gemmata
obscuriglobus and Rhodopirellula baltica. We also provide experimental evidence
that is inconsistent with endocytosis-like macromolecule uptake; instead,
extracellular macromolecules can be taken up and accumulate in the periplasmic
space through unclear mechanisms.