Name: gut and environment bacteria in bacteroidota
Uploaded: 2025-06-12T09:22:13.000Z
Duration: 1 min 26 s
Channel: JoVE

Der Stamm Bacteroidota umfasst gramnegative Stäbchen, die in vier Ordnungen eingeteilt sind - Bacteroidales, Cytophagales, Flavobacteriales und Sphingobacteriales. Die Ordnung Bacteroidales umfasst in erster Linie obligat anaerobe, fermentative Bakterien. Bemerkenswert ist, dass die Gattung Bacteroides einen signifikanten Teil der mikrobiellen Biomasse im menschlichen Dickdarm ausmacht. Die Ordnung der Cytophagalen umfasst in erster Linie obligate Aerobe, die typischerweise lange, schlanke Stäbchen sind, oft mit spitzen Enden. Cytophaga ist eine Schlüsselgattung der Cytophagales, die in der Lage ist, Zellulose, Agar und Chitin abzubauen. Die Ordnung Flavobacteriales umfasst die weit verbreitete Gattung Flavobacterium und die Gattungen Polaribacter und Psychroflexus, die in polaren Gewässern und im Meereis gedeihen. Die Ordnung der Sphingobakterien ist eine vielfältige Gruppe, die häufig in Böden und Süßwasserumgebungen vorkommt. Sphingobacterium ist die repräsentative Gattung. Sphingobacterium -Spezies sind unbewegliche Stäbchen ohne Flagellen. Darüber hinaus erscheinen viele Arten innerhalb der Gattung Sphingobacterium pigmentiert, da sie Carotinoide in ihren Zellwänden besitzen.

bakterien phylum bacteroidetes

Bacterial Phylum Bacteroidota

Der Stamm Bacteroidota umfasst &#252;ber 700 Arten, die in vier Hauptordnungen eingeteilt sind: Bacteroidales, Cytophagales, Flavobacteriales und Sphingobacteriales.
Diese gramnegativen, nicht-sporenbildenden St&#228;bchen weisen saccharolytische F&#228;higkeiten auf und k&#246;nnen aerob oder fermentativ sein, einschlie&#223;lich obligat aerober, fakultativ aerober und obligat anaerober Formen. Viele Arten zeigen Gleitbeweglichkeit, w&#228;hrend einige unbeweglich sind oder Flagellen zur Fortbewegung nutzen. Die Gattung Bacteroides ist aufgrund ihrer bedeutenden Rolle in der menschlichen Darmmikrobiota gut untersucht.
Bacteroidales
Die Ordnung Bacteroidales besteht aus obligat anaeroben, fermentativen Bakterien. Die Gattung Bacteroides verstoffwechselt Zucker oder Proteine und produziert dabei Acetat und Succinat. Diese Bakterien dominieren den menschlichen Dickdarm, k&#246;nnen jedoch als opportunistische Pathogene auftreten und Infektionen wie Bakteri&#228;mie verursachen. Bacteroides thetaiotaomicron ist auf den Abbau von Polysacchariden spezialisiert und codiert zahlreiche Gene f&#252;r den Kohlenhydratstoffwechsel, die im menschlichen Genom nicht vorhanden sind. Ein einzigartiges Merkmal von Bacteroides ist seine F&#228;higkeit zur Synthese von Sphingolipiden &#8211; eine Lipidklasse, die bei Bakterien selten vorkommt.
Cytophagales
Cytophagales besteht haupts&#228;chlich aus obligat aeroben Bakterien, die komplexe Polysaccharide abbauen. Diese langen, schlanken St&#228;bchen zeigen Gleitbewegung und tragen zum Zelluloseabbau in Boden- und S&#252;&#223;wasser&#246;kosystemen bei. Cytophaga hutchinsonii besitzt keine prozessiven Cellulasen und ist auf direkten Kontakt mit Zellulosefasern zur Zersetzung angewiesen. Cytophaga-Arten bauen Zellulose, Agar und Chitin ab, w&#228;hrend einige, wie Cytophaga columnaris und Cytophaga psychrophila, Fischpathogene sind, die Gewebezerst&#246;rungen in der Aquakultur verursachen.
Flavobacteriales und Sphingobacteriales
Flavobacteriales und Sphingobacteriales umfassen aerobe und fakultativ aerobe chemoorganotrophe Organismen. Einige Mitglieder dieser Ordnungen sind gramnegative saccharolytische St&#228;bchen, die h&#228;ufig Gleitbewegungen zeigen und komplexe Polysaccharide in verschiedenen Umgebungen abbauen. Flavobacterium-Arten, die zur Ordnung Flavobacteriales geh&#246;ren, kommen in aquatischen Umgebungen sowie bei der Lebensmittelverarbeitung vor. Einige Arten, wie Flavobacterium meningosepticum, sind pathogen. An K&#228;lte angepasste Gattungen wie Polaribacter und Psychroflexus gedeihen in polaren Gew&#228;ssern und im Meereis.
Sphingobacterium sp. geh&#246;rt zur Ordnung der Sphingobacteriales. Es handelt sich um eine Gattung gramnegativer, st&#228;bchenf&#246;rmiger, nicht sporenbildender Bakterien, die typischerweise in B&#246;den, Gew&#228;ssern und klinischen Umgebungen vorkommen. Diese Bakterien sind bekannt f&#252;r ihre F&#228;higkeit, komplexe organische Verbindungen abzubauen, und spielen eine Rolle bei der Bioremediation. Viele Arten produzieren gelbe bis orangefarbene Carotinoidpigmente, was zu ihrer charakteristischen F&#228;rbung beitr&#228;gt.
Bacteroidota spielen eine entscheidende Rolle im N&#228;hrstoffkreislauf und beim Abbau organischer Substanz. W&#228;hrend die meisten Vertreter n&#252;tzlich sind, stellen einige, wie Bacteroides und Cytophaga, opportunistische Pathogene dar. Ihre metabolische Vielfalt macht sie bedeutsam f&#252;r die menschliche Gesundheit, die Mikrobiologie und industrielle Anwendungen.

Bakterien Phylum Bacteroidetes

Der Stamm Bacteroidota umfasst &#252;ber 700 Arten, die in vier Hauptordnungen eingeteilt sind: Bacteroidales, Cytophagales, Flavobacteriales und ...

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gut and environment bacteria in bacteroidota

Bacteroidota is a bacterial phylum with more than 700 species. It includes four main orders: Bacteroidales, Cytophagales, Flavobacteriales, and Sphingobacteriales. These bacteria are gram-negative, do not form spores, and are usually rod-shaped. They can be aerobic or fermentative, and some use gliding motility while others are nonmotile or move with flagella.

Bacteroidales includes obligately anaerobic, fermentative bacteria. The genus Bacteroides is especially important because it lives in the human gut microbiota. These bacteria break down sugars or proteins and produce acetate and succinate. They are common in the large intestine, but some can act as opportunistic pathogens and cause infections such as bacteremia. Bacteroides thetaiotaomicron is known for breaking down polysaccharides, and it carries many carbohydrate metabolism genes that humans do not have. A rare trait in this genus is the ability to make sphingolipids, a lipid type that is uncommon in bacteria.

Cytophagales mainly includes obligate aerobes that degrade complex polysaccharides. These bacteria are long and slender, and many show gliding motility. They help break down cellulose in soil and freshwater. Cytophaga hutchinsonii does not use processive cellulases and instead depends on direct contact with cellulose fibers. Other Cytophaga species digest cellulose, agar, and chitin. Some, including Cytophaga columnaris and Cytophaga psychrophila, are fish pathogens that damage tissues in aquaculture.

Flavobacteriales and Sphingobacteriales include aerobic and facultatively aerobic chemoorganotrophs. A chemoorganotroph uses organic compounds for energy and growth. Many of these bacteria are gram-negative rods, are saccharolytic, and often glide while breaking down complex polysaccharides in different habitats. Flavobacterium species live in aquatic and food-processing environments, and some, such as Flavobacterium meningosepticum, can be pathogenic. Cold-adapted genera like Polaribacter and Psychroflexus thrive in polar waters and sea ice. Sphingobacterium species are found in soil, water, and clinical settings. They can break down complex organic compounds, support bioremediation, and often produce yellow to orange carotenoid pigments.

Bacteroidota play important roles in nutrient cycling and the breakdown of organic matter. Most are helpful in their environments, but some Bacteroides and Cytophaga species can cause disease as opportunistic pathogens. Their wide range of metabolism makes them important in human health, microbiology, and industrial uses.

Gut and Environment Bacteria in Bacteroidota

gut-and-environment-bacteria-in-bacteroidota

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bacterial phylum verrucomicrobiota

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bacterial phylum bacteroidota

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diversity of protists ii

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diversity of protists iii

Rhizaria: Pseudopods, Tests, and Skeletons

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diversity of protists iv

Amoebozoa: Movement and Life Cycles

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key terms and concepts

Explore Bacteroidota bacteria in the gut, soil, water, and sea ice. Learn how these gram-negative microbes digest polysaccharides and affect health.

Gut and Environment Bacteria in Bacteroidota | 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.

microbiology

Gut and Environment Bacteria in Bacteroidota

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