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A common member of the human gut.
Fuel sources used:
This species is considered a generalist because it can use a wide range of fuel sources for energy including fibre, resistant starch, simple sugars, protein, and mucus.
Metabolites produced:
Our genomic analysis indicates that most members of this species can produce the following metabolites: acetate, BCAAs, butyrate, GABA, lactate, LPS, propionate, succinate, folate, biotin, riboflavin.
Metabolites consumed:
In addition, our genomic analysis indicates that most members of this species do not consume any reported metabolites.
This organism has many types of mobile genetic elements. A large portion of the B. thetaiotaomicron proteome is dedicated to harvesting dietary polysaccharides and metabolizing their liberated sugars. Previous studies in germfree mice revealed that B. thetaiotaomicron stimulates angiogenesis during postnatal intestine development, thereby increasing the host's capacity for absorbing nutrients. B. thetaiotaomicron also regulates synthesis of various gut epithelial glycans, including those with terminal _-linked fucose, that can be harvested by its _-fucosidases. [PMID: 12663928]
This microorganism can utilize dozens of dietary plant polysaccharides and host-derived mucosal glycans. [PMID: 24330590] The infographic of Bacteroides thetaiotaomicron ( Bt) illustrates two key facets of its symbiotic lifestyle in the human gut: a broad ability to digest dietary fiber polysaccharides and host glycans, and a dynamic cell-surface architecture that promotes both interactions with and evasion of the host immune system. The starch-utilization system (Sus) is a cell-surface and periplasmic system involved in starch cleavage and transport. Over 80 additional Sus-like systems utilize substrates ranging from host glycans to plant cell wall pectins. Bt has evolved intricate strategies to interact with other microbes or its host, including modification of its surface. Some nutrient utilization pathways select for or directly trigger changes in capsular polysaccharide (CPS) expression. Like other fermentative members of the gut microbiome, Bt produces host absorbable short-chain and organic acids, which can all be absorbed by the host as a source of energy. [https://doi.org/10.1016/j.tim.2018.08.005] One of the most studied representatives of this genus is Bacteroides thetaiotaomicron, a Gram-negative obligate anaerobe that is notable for its ability to utilize a wide variety of polysaccharides using the extensive saccharolytic machinery that is controlled by an expanded repertoire of transcription factors (TFs). [PMID: 24330590]
The human distal gut microbiota contain more bacterial cells than all of our body's other microbial communities combined. More than 90% of phylogenetic types belong to two divisions, the Bacteroidetes and the Firmicutes, with the remaining types distributed among eight other divisions. Bacteroides thetaiotaomicron is a Gram-negative anaerobe bacterium. It is a dominant member of human distal intestinal microbiota. [UP000001414]
Distaso, A (1912). Contribution à l'étude sur l'intoxication intestinale. Zbl. Bakt. Parasit. 62: 433-468.
Lineage | Physiology | General | Growth Tolerances | Hydrol./digest./degr. |
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Health:
Positive
Source: human faeces and clinical sources (blood - CCUG)
DNA G+C(%): 42
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Bile reaction(%): 20(+)
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Monosaccharide O/F | Oligosaccharide O/F | Polysaccharide O/F | Polyol O/F | Other O/F |
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Monosaccharide util/assim | Oligosaccharide util/assim | Other carboh. util/assim | Amino acid util/assim | Organic acid util/assim |
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Enzymes: General | Enzymes: Carbohydrate | Enzymes: Protein | Enzymes: Arylamidases | Enzymes: Esters/fats |
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Fuel | Usable Metabolites | Metabolites Released | Special Products | Compounds Produced |
Fibre, Complex Polysacc., Starch, Resistant Starch, Pectin, Mucus, Simple Sugars, Protein |
None/Unknown |
Branched-Chain AA, Folate, Biotin, Riboflavin, Acetate, Lactate, Propionate, Butyrate, Succinate, GABA |
LPS Antigen |
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Penicillins & Penems (μg/mL) | Cephalosporins (μg/mL) | Aminoglycosides (μg/mL) | Macrolides (μg/mL) | Quinolones (μg/mL) |
amoxicillin: R(MIC50): 32, MIC90: >128, RNG: (16->128)
Augmentin: Var(MIC50): 1, MIC90: 8, RNG: (0.5-8)
ampicillin: R(MIC50): 64, MIC90: >128, RNG: (32->128)
amp-sulb: S(MIC50): 4, MIC90: 16, RNG: (1–64)
azlocillin: Res
aztreonam: Res
bacampicillin: Res
benzyl-pen: Res
cloxacillin: Res
dicloxacillin: Res
oxacillin: R(64)
penicillin: R(MIC50): 32, MIC90: >128, RNG: (16->128)
penicillin_G: R(MIC50): 32, MIC90: >64, RNG: (4–>64)
piperacillin: R(MIC50): 64, MIC90: >256, RNG: (4->256)
piper-taz: S(MIC50): 16, MIC90: 32, RNG: (8–>64)
ticarcillin: R(MIC50): 8, MIC90: 16, RNG: (32->128)
tica-clav: S(MIC50): 2, MIC90: 16, RNG: (0.1–128)
doripenem: S(MIC50): 0.5, MIC90: 1, RNG: (0.12-2)
ertapenem: S(MIC50): 0.5, MIC90: 2, RNG: (0.03-8)
imipenem: S(MIC50): 0.25, MIC90: 2, RNG: (0.125-2)
meropenem: S(MIC50): 0.25, MIC90: 0.5, RNG: (0.125-0.5)
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cefaclor: R(>3000)
cefadroxil: Res
cefamandole: R(64/>64)
cefazolin: R(16)
cefdinir: Res
cefepime: R(MIC50): >128, MIC90: >128, RNG: (16–>128)
cefixime: Var(MIC50): 1, MIC90: 16, RNG: (1-16)
cefmetazole: R(MIC50): 64, MIC90: >128, RNG: (8->128)
cefoperazone: R(32/64)
cefotaxime: R(MIC50): 64, MIC90: >256, RNG: (0.25->256)
cefotetan: R(MIC50): 64, MIC90: 256, RNG: (2-256)
cefotiam: R(MIC50): >128, MIC90: >128, RNG: (128->128)
cefoxitin: S(MIC50): 32, MIC90: 64, RNG: (16–>64)
cefpodoxime: Var(MIC50): 0.5, MIC90: >64, RNG: (0.25->64)
cefprozil: R(MIC50): 8, MIC90: 16, RNG: (8-16)
ceftazidime: R(MIC50): 128, MIC90: >256, RNG: (4->256)
ceftizoxime: R(MIC50): 64, MIC90: >256, RNG: (≤0.062->256)
cefuroxime: R(MIC50): 16, MIC90: 64, RNG: (0.5->64)
cephalothin: Res
moxalactam: R(MIC50): 64, MIC90: 128, RNG: (1->128)
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amikacin: R(>256)
dihydrostrept: Res
gentamicin: Res
kanamycin: Res
neomycin: Res
sisomicin: Res
spectinomycin: Res
streptomycin: Res
tobramycin: R(>1024)
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azithromycin: R(MIC50): >32, MIC90: >32, RNG: (32–>32)
erythromycin: R(MIC50): 8, MIC90: >32, RNG: (2–>32)
fidaxomicin: R(MIC50): >512, MIC90: >512, RNG: (>512)
clarithromycin: R(MIC50): 8, MIC90: >32, RNG: (2–>32)
quin-dalf: R(MIC50): 16, MIC90: 32, RNG: (8-32)
roxithromycin: R(MIC50): >32, MIC90: >32, RNG: (16–>32)
spiramycin: Var(MIC50): 5), MIC90: Var(5
telithromycin: R(MIC50): 8, MIC90: >32, RNG: (2–>32)
josamycin: Sens
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linezolid: Var(MIC50): 4, MIC90: 8, RNG: (2-8)
ciprofloxacin: R(MIC50): 32, MIC90: >32, RNG: (16–>32)
clavulanate: Res
clinafloxacin: S(MIC50): 0.06, MIC90: 0.25, RNG: (0.03-0.25)
enoxacin: Sens
garenoxacin: S(MIC50): 1, MIC90: 4, RNG: (0.25-16)
gatifloxacin: S(MIC50): 1, MIC90: 2, RNG: (1->16)
gemifloxacin: S(MIC50): 1, MIC90: 1, RNG: (0.125–16)
levofloxacin: Var(MIC50): 8, MIC90: 8, RNG: (1->32)
moxifloxacin: Var(MIC50): 4, MIC90: 32, RNG: (0.5–64)
nalidixic-acid: Res
norfloxacin: R(>256)
ofloxacin: R(MIC50): 16, MIC90: 16, RNG: (8-256)
pefloxacin: Sens
pipemidic_acid: Res
sarafloxacin: Sens
sparfloxacin: S(MIC50): 2, MIC90: 2, RNG: (0.25–2)
trovafloxacin: S(MIC50): 0.5, MIC90: 2, RNG: (0.25-8)
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Tetracyclines (μg/mL) | Vancomycin Class (μg/mL) | Polypep/ketides (μg/mL) | Heterocycles (μg/mL) | Other (μg/mL) |
doxycycline: S(0.023)
chlortetracycline: Sens
meclocycline: Sens
methacycline: Sens
minocycline: Sens
oxytetracycline: Sens
tetracycline: Sens
tigecycline: S(MIC50): 1, MIC90: 4, RNG: (≤0.06-8)
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teicoplanin: R(MIC50): 64, MIC90: 128, RNG: (16–128)
vancomycin: R(MIC50): 64, MIC90: 128, RNG: (32–256)
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bacitracin: R(MIC50): >256, MIC90: >256, RNG: (16–>256)
rifabutin: Sens
rifampicin: Sens
rifapentine: Sens
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chloramphenicol: S(MIC50): 4, MIC90: 8, RNG: (2-8)
fosfomycin: R(>1024)
isoniazid: Res
metronidazole: S(MIC50): 1, MIC90: 1, RNG: (0.5-2)
nitrofurantoin: Sens
ranbezolid: S(MIC50): 0.06, MIC90: 0.125, RNG: (0.06-0.125)
sulfadiazine: Res
sulfadimethoxine: Res
sulfamethoxazole: R(48)
sulfanilamide: Res
trimethoprim: R(>32)
SXT: S(1.5)
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clindamycin: Var(MIC50): 4, MIC90: >32, RNG: (0.25->32)
lincomycin: Sens
daptomycin: R(MIC50): >32, MIC90: >32, RNG: (>32)
colistin: R(>1024)
fusidic-acid: Sens
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