Regarding the presence of membrane coat proteins in bacteria: Confusion? What confusion?

Devos, Damien P.

doi:10.1002/bies.201100147

Cited by 20 publications

(17 citation statements)

References 11 publications

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“…In addition, this endomembrane system is in contact with proteins that are structurally similar to membrane coat proteins, such as clathrin, which are most likely involved in its maintenance or organization (Santarella-Mellwig et al, 2010). There is no proof of homology between the bacterial and eukaryotic membrane coat proteins, but structural, architectural and functional similarities support an evolutionary relationship between them (Devos, 2012). No sign of lateral gene transfer in any direction, to or from eukaryotes has, however, been detected (Santarella-Mellwig et al, 2010).…”

Section: Resultsmentioning

confidence: 99%

A bacterial tubulovesicular network

Acehan¹,

Santarella-Mellwig²,

Devos

2013

Journal of Cell Science

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Section: Resultsmentioning

confidence: 99%

A bacterial tubulovesicular network

Acehan¹,

Santarella-Mellwig²,

Devos

2013

Journal of Cell Science

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“…S10 can be found in both fully and partially assembled ribosomes (38), whereas EF-Tu can be bound only to an assembled ribosome (22) and thus is a better indicator of active protein synthesis. Further Fig.…”

Section: Discussionmentioning

confidence: 99%

“…The studies of Acehan et al (16) and Santarella-Mellwig et al (17) suggest that the endomembranes constitute a highly invaginated cytoplasmic membrane (and thus an extension of the typical Gram-negative cell plan) and that cytoplasmic volumes are all interconnected. These conflicting interpretations support conflicting opinions about the evolutionary relationship of G. obscuriglobus to eukaryotes (20)(21)(22). Regardless of its evolutionary history, the complex endomembrane network creates a unique cellular context for the spatial organization of gene expression.…”

mentioning

confidence: 99%

Spatially segregated transcription and translation in cells of the endomembrane-containing bacterium Gemmata obscuriglobus

Gottshall

Seebart

Gatlin

et al. 2014

Proc. Natl. Acad. Sci. U.S.A.

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The dogma of coupled transcription and translation in bacteria has been challenged by recent reports of spatial segregation of these processes within the relatively simple cellular organization of the model organisms Escherichia coli and Bacillus subtilis. The bacterial species Gemmata obscuriglobus possesses an extensive endomembrane system. The membranes generate a very convoluted intracellular architecture in which some of the cell's ribosomes appear to have less direct access to the cell's nucleoid(s) than others. This observation prompted us to test the hypothesis that a substantial proportion of G. obscuriglobus translation may be spatially segregated from transcription. Using immunofluorescence and immunoelectron microscopy, we showed that translating ribosomes are localized throughout the cell, with a quantitatively greater proportion found in regions distal to nucleoid(s). Our results extend information about the phylogenetic and morphological diversity of bacteria in which the spatial organization of transcription and translation has been studied. These findings also suggest that endomembranes may provide an obstacle to colocated transcription and translation, a role for endomembranes that has not been reported previously for a prokaryotic organism. Our studies of G. obscuriglobus may provide a useful background for consideration of the evolutionary development of eukaryotic cellular complexity and how it led to decoupled processes of gene expression in eukaryotes.

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“…In one dramatic example, such a compartment has been adapted to serve a specialized function in the unique anammox physiology, where the anammoxosome organelle forms an elegant analog of mitochondrial organelles in eukaryotes and the basis for biochemical models involving transfer of protons between internal cell compartments to generate ATP. The functional and evolutionary implications of the other dramatic example, the nuclear body of G. obscuriglobus remain to be worked out, and the evolutionary significance of planctomycete compartmentalization is still controversial [Devos, 2012;McInerney et al, 2011]. This organelle and its membranous envelope and the yet unknown mechanisms for how material is transported across it will in any case be likely to contribute to our understanding of how a nuclear organelle and functional endomembrane systems could have originated.…”

Section: Discussionmentioning

confidence: 99%

Nested Bacterial Boxes: Nuclear and Other Intracellular Compartments in Planctomycetes

Fuerst¹,

Sagulenko²

2013

Microb Physiol

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Bacteria in the phylum Planctomycetes and some related phyla challenge our concept of the typical bacterium as consisting of cells without internal compartments or membrane-bounded organelles. Cells of all species of planctomycetes examined consist of at least two major compartments, and there are two other types of compartmentation in which a third compartment is formed either by a double-membrane envelope around the nucleoid in the case of the aerobic Gemmata obscuriglobus or by a single but potentially energized membrane in the case of the anaerobic ammonium-oxidizing anammox planctomycetes. We examine here the nature of these planctomycete compartments in relation to function and their relationship to the endomembranes defining them, and discuss the implications of the remarkable compartment-confined process of protein uptake in Gemmata, which resembles receptor- and clathrin-mediated endocytosis of eukaryotes. Planctomycetes have implications for our understanding of the evolution of membrane-bounded organelles, of endomembranes, transport across endomembranes and membrane trafficking, and for how the complexity of a eukaryote style of cell organization could have originated.

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Regarding the presence of membrane coat proteins in bacteria: Confusion? What confusion?

Cited by 20 publications

References 11 publications

A bacterial tubulovesicular network

A bacterial tubulovesicular network

Spatially segregated transcription and translation in cells of the endomembrane-containing bacterium Gemmata obscuriglobus

Nested Bacterial Boxes: Nuclear and Other Intracellular Compartments in Planctomycetes

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