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Bacterial Phylum Planctomycetes

Bacterial Phylum Planctomycetes

Planctomycetes are a group of morphologically distinct bacteria predominantly classified into two orders: Planctomycetales and Brocadiales. These gram-negative bacteria exhibit unique features, including division by budding and the presence of stalks or appendages. Their cells are often found in rosette arrangements, and they are notable for possessing an S-layer in their cell envelope, which is relatively uncommon among bacteria. Additionally, Planctomycetes frequently exhibit intracellular...

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Identification of Fatty Acids in Bacillus cereus

Identification of Fatty Acids in Bacillus cereus

Published on: December 5, 2016

On the maverick Planctomycetes.

Sandra Wiegand¹, Mareike Jogler², Christian Jogler¹

¹Department of Microbiology, Radboud University, Heyendaalseweg 135, Nijmegen, The Netherlands.

FEMS Microbiology Reviews

|July 28, 2018

Summary

This summary is machine-generated.

Planctomycetes bacteria possess a peptidoglycan cell wall and a cell structure similar to Gram-negative bacteria. These findings challenge previous theories about their evolutionary relationship to eukaryotes.

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Area of Science:

Microbiology
Evolutionary Biology
Cell Biology

Background:

Planctomycetes are ubiquitous bacteria crucial for global carbon and nitrogen cycles.
Historically, they exhibited traits blurring prokaryote/eukaryote distinctions, suggesting unique evolutionary paths.
Previous research indicated a nucleus-like compartment and lack of peptidoglycan, fueling theories of eukaryotic ancestry.

Purpose of the Study:

To re-evaluate the cellular structure and evolutionary position of Planctomycetes.
To investigate the presence of a peptidoglycan cell wall and cell division mechanisms.
To challenge hypotheses suggesting Planctomycetes are ancestral to eukaryotes.

Main Methods:

Advanced microscopic techniques.
Development of genetic tools for Planctomycetes.
Comparative analysis of cellular structures and components.

Main Results:

Planctomycetes possess a peptidoglycan cell wall, a key bacterial feature.
Their cell plan is comparable to other Gram-negative bacteria.
The previously described nucleus-like structure is an invagination of the cytoplasmic membrane, not a true nucleus.

Conclusions:

Planctomycetes are distinct bacteria, not a link between prokaryotes and eukaryotes.
Their unique features represent bacterial adaptations rather than primitive eukaryotic traits.
Findings necessitate a revised understanding of bacterial diversity and evolution.