Name: verrucomicrobiota cell structure and traits
Uploaded: 2025-06-05T06:42:28.000Z
Duration: 1 min 26 s
Channel: JoVE

L’embranchement Verrucomicrobiote est classé en quatre ordres, la plupart des espèces étant classées dans l’ordre Verrucomicrobiales. Les espèces de cet embranchement sont des bactéries aérobies obligatoires ou facultatives largement réparties dans divers environnements, y compris l’eau douce, les habitats marins, les sols forestiers et les terres agricoles. Les espèces de verrucomicrobiote contribuent au cycle du carbone. De nombreuses espèces fermentent les sucres, tandis que les méthanotrophes aérobies comme le genre Methylacidiphilum oxydent le méthane. Il est intéressant de noter que les espèces du Verrucomicrobiote possèdent des extensions cytoplasmiques membranaires appelées prothèses. Ces appendices sont soutenus par le peptidoglycane dans leurs parois cellulaires. Les genres Verrucomicrobium et Prosthecobacter sont remarquables pour produire plusieurs prothèses sur chaque cellule. Elles subissent une division cellulaire symétrique, de sorte que les cellules mères et filles possèdent des prothèses au moment de la division. Les espèces de Prosthecobacter ont deux gènes qui présentent une homologie significative avec les gènes codant pour la tubuline dans les cellules eucaryotes. Mais leur fonction reste incertaine, car aucun cytosquelette de type eucaryote n’a été observé chez ces bactéries.

phylum bactérien verrucomicrobia

Bacterial Phylum Verrucomicrobiota

Le phylum Verrucomicrobiota comprend au moins quatre ordres caract&#233;ris&#233;s, dont la majorit&#233; des esp&#232;ces sont class&#233;es dans l&#8217;ordre des Verrucomicrobiotales. Les membres de ce phylum sont soit a&#233;robies, soit a&#233;robies facultatifs, et poss&#232;dent la capacit&#233; de fermenter les sucres. Une exception notable est le genre Methylacidiphilum, qui regroupe des m&#233;thanotrophes a&#233;robies. Par ailleurs, certaines Verrucomicrobiota &#233;tablissent des relations symbiotiques avec des protistes. Ces bact&#233;ries sont largement r&#233;parties dans divers environnements, notamment les eaux douces, les milieux marins, les sols forestiers et les terres agricoles.
&#192; l&#8217;instar des Planctomycetes, les Verrucomicrobiota poss&#232;dent des structures intracellulaires entour&#233;es de membranes. Cependant, une caract&#233;ristique distinctive des Verrucomicrobiota est la pr&#233;sence de prolongements cytoplasmiques appel&#233;s prosthecae. Ces appendices sont soutenus par du peptidoglycane dans leurs parois cellulaires, ce qui les diff&#233;rencie des Planctomycetes.
Les genres Verrucomicrobium et Prosthecobacter sont remarquables par la production de multiples prosth&#232;ques sur chaque cellule. Contrairement &#224; Caulobacter, qui d&#233;veloppe une seule prosth&#232;que et lib&#232;re des cellules nageuses flagell&#233;es d&#233;pourvues de prosth&#232;ques, Verrucomicrobium et Prosthecobacter se divisent sym&#233;triquement, produisant des cellules m&#232;res et filles qui poss&#232;dent toutes deux des prosth&#232;ques au moment de la division. Le nom Verrucomicrobium vient du grec et signifie &#171; verruqueux &#187;, d&#233;crivant bien l&#8217;aspect de Verrucomicrobium spinosum, avec ses multiples prosth&#232;ques saillantes.
Une caract&#233;ristique remarquable des esp&#232;ces de Prosthecobacter est la pr&#233;sence de deux g&#232;nes pr&#233;sentant une forte similitude avec ceux codant pour la tubuline des cellules eucaryotes. La tubuline est la prot&#233;ine principale constituant le cytosquelette des eucaryotes. Bien que la prot&#233;ine bact&#233;rienne de division cellulaire FtsZ soit &#233;galement un homologue de la tubuline, les prot&#233;ines de type tubuline chez Prosthecobacter pr&#233;sentent une ressemblance structurale plus &#233;troite avec la tubuline eucaryote. Malgr&#233; cette similitude, la fonction de ces prot&#233;ines chez Prosthecobacter reste inconnue, aucun cytosquelette semblable &#224; celui des eucaryotes n&#8217;ayant &#233;t&#233; observ&#233; dans ces bact&#233;ries.

Phylum bactérien Verrucomicrobia

Le phylum Verrucomicrobiota comprend au moins quatre ordres caract&#233;ris&#233;s, dont la majorit&#233; des esp&#232;ces sont class&#233;es dans ...

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verrucomicrobiota cell structure and traits

Verrucomicrobiota are a bacterial phylum with several recognized orders, and most species belong to Verrucomicrobiotales. Many members are aerobic or facultatively aerobic, which means they can use oxygen but may also grow without it. They can also ferment sugars. One exception is the genus Methylacidiphilum, which contains aerobic methanotrophs, bacteria that use methane and oxygen.

These bacteria live in many different places. They are found in freshwater, marine habitats, forest soils, and agricultural land. Some Verrucomicrobiota also form symbiotic relationships with protists, which are single-celled eukaryotes.

Verrucomicrobiota have membrane-bound internal structures, similar to Planctomycetes. They also have cytoplasmic extensions called prosthecae. These appendages are supported by peptidoglycan in the cell wall, which helps distinguish them from Planctomycetes. The genera Verrucomicrobium and Prosthecobacter are known for having multiple prosthecae on each cell.

Their cell division is also unusual. Unlike Caulobacter, which forms a single prostheca and releases flagellated swarmer cells without prosthecae, Verrucomicrobium and Prosthecobacter divide symmetrically. This means both the mother cell and the daughter cell have prosthecae at the time of division. The name Verrucomicrobium comes from a Greek word meaning &quot;warty,&quot; which matches the look of Verrucomicrobium spinosum and its many protruding prosthecae.

Prosthecobacter species are especially notable because they carry two genes that are very similar to genes for eukaryotic tubulin. Tubulin is the main protein that forms the eukaryotic cytoskeleton. Bacteria also have FtsZ, another tubulin homolog involved in cell division. However, the Prosthecobacter proteins are even more similar in structure to eukaryotic tubulin, and their function is still unclear. No eukaryotic-like cytoskeleton has been seen in these bacteria.

Verrucomicrobiota Cell Structure and Traits

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key terms and concepts

Explore Verrucomicrobiota cell features, prosthecae, habitat diversity, symbiosis with protists, and the unusual tubulin-like genes in Prosthecobacter.

Verrucomicrobiota Cell Structure and Traits | JoVE K12

JoVE Core Microbiology provides an engaging introduction to the microbial world and its influence on health, industry, and the environment. This comprehensive collection covers key concepts such as microbial structure, metabolism, genetics, and ecology. It introduces essential laboratory techniques and microscopy methods through visually engaging animations. Corresponding scientist-in-action videos bridge classroom concepts with real-world research and applications.

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Verrucomicrobiota Cell Structure and Traits

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