“Raoultibacter massiliensis” gen. nov., sp. nov., a new bacterium isolated from the human gut of a Saudi Bedouin

Traore, S.I.; Yasir, Muhammad; Azhar, Esam I.; Bibi, Fehmida; Bittar, Fadi; Jiman-Fatani, Asif A.; Fournier, Pierre‐Edouard; Edouard, Sophie

doi:10.1016/j.nmni.2016.06.013

Cited by 8 publications

(5 citation statements)

References 7 publications

(7 reference statements)

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“…1 ). Hence, strain Marseille-P3277 can be classified as a new species because it exhibited a 16S rRNA gene sequence similarity <98.65% with its phylogenetically closest species [4] , [5] . We propose the creation of the new species named ‘ Raoultibacter timonensis ’ (ti.mo.nen′sis.…”

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confidence: 99%

‘Raoultibacter timonensis’ gen. nov., sp. nov. , a new bacterium isolated from the human gut of a Pygmy woman

Bilen

Cadoret

Dubourg

et al. 2017

New Microbes and New Infections

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confidence: 99%

‘Raoultibacter timonensis’ gen. nov., sp. nov. , a new bacterium isolated from the human gut of a Pygmy woman

Bilen

Cadoret

Dubourg

et al. 2017

New Microbes and New Infections

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“…strain Marseille-P8396 (90% nt identity). The 23S rRNA gene (2,633 nt) was most identical (85% nt identity) to Gordonibacter massiliensis Marseille-P2775 isolated from a human fecal sample (61). These findings indicate that the two environmental Coriobacteriales MAGs are distantly related to Coriobacteriales isolated from human microbiomes.…”

Section: Figmentioning

confidence: 75%

High-Level Abundances ofMethanobacterialesandSyntrophobacteralesMay Help To Prevent Corrosion of Metal Sheet Piles

Zandt

Kip

Frank

et al. 2019

Appl Environ Microbiol

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Iron sheet piles are widely used in flood protection, dike construction, and river bank reinforcement. Their corrosion leads to gradual deterioration and often makes replacement necessary. Natural deposit layers on these sheet piles can prevent degradation and significantly increase their life span. However, little is known about the mechanisms of natural protective layer formation. Here, we studied the microbially diverse populations of corrosion-protective deposit layers on iron sheet piles at the Gouderak pumping station in Zuid-Holland, the Netherlands. Deposit layers, surrounding sediment and top sediment samples were analyzed for soil physicochemical parameters, microbially diverse populations, and metabolic potential. Methanogens appeared to be enriched 18-fold in the deposit layers. After sequencing, metagenome assembly and binning, we obtained four nearly complete draft genomes of microorganisms (Methanobacteriales, two Coriobacteriales, and Syntrophobacterales) that were highly enriched in the deposit layers, strongly indicating a potential role in corrosion protection. Coriobacteriales and Syntrophobacterales could be part of a microbial food web degrading organic matter to supply methanogenic substrates. Methane-producing Methanobacteriales could metabolize iron, which may initially lead to mild corrosion but potentially stimulates the formation of a carbonate-rich protective deposit layer in the long term. In addition, Methanobacteriales and Coriobacteriales have the potential to interact with metal surfaces via direct interspecies or extracellular electron transfer. In conclusion, our study provides valuable insights into microbial populations involved in iron corrosion protection and potentially enables the development of novel strategies for in situ screening of iron sheet piles in order to reduce risks and develop more sustainable replacement practices. IMPORTANCE Iron sheet piles are widely used to reinforce dikes and river banks. Damage due to iron corrosion poses a significant safety risk and has significant economic impact. Different groups of microorganisms are known to either stimulate or inhibit the corrosion process. Recently, natural corrosion-protective deposit layers were found on sheet piles. Analyses of the microbial composition indicated a potential role for methane-producing archaea. However, the full metabolic potential of the microbial communities within these protective layers has not been determined. The significance of this work lies in the reconstruction of the microbial food web of natural corrosion-protective layers isolated from noncorroding metal sheet piles. With this work, we provide insights into the microbiological mechanisms that potentially promote corrosion protection in freshwater ecosystems. Our findings could support the development of screening protocols to assess the integrity of iron sheet piles to decide whether replacement is required.

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“…Anaerofustis, Fecalimonas, Mediterraneibacter (a reclassified Ruminococcus) and Raoultibacter (recently identified) [45,46] were negatively affected in HFD, which was reversed in both interventions. Pseudoflavonifractor, Intestinimonas are reported to increase in obesity [47,48].…”

Section: Discussionmentioning

confidence: 97%

“…Schaedlerella – another reclassified arabinose-feeding Clostridium genus [43], and Anaerotignum (reclassified C. lactatifermentans [44]) were improved in both mucin and capsaicin administration. Anaerofustis, Fecalimonas, Mediterraneibacter (a reclassified Ruminococcus) and Raoultibacter (recently identified) [45,46] were negatively affected in HFD, which was reversed in both interventions. Pseudoflavonifractor, Intestinimonas are reported to increase in obesity [47,48].…”

Section: Discussionmentioning

confidence: 99%

Mucin-mimetic action of capsaicin improves high fat diet-induced gut barrier dysfunction in mice colon

Kumar

Mahajan

et al. 2021

Preprint

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The gut barrier – including tight junction proteins and mucus layers, is the first line of defense against physical, chemical, or pathogenic incursions. This barrier is compromised in various health disorders. Capsaicin, a dietary agonist of Transient receptor potential vanilloid 1 (TRPV1) channel, is reported to alleviate the complications of obesity. While its mode of action is well established to enhance energy expenditure, metabolism and prevent dysbiosis, the more local effects on the host gut – particularly the gut barrier and mucus system remain elusive.We employed a diet-induced obesity model to investigate the effect of capsaicin on the gut barrier and mucus production and to understand the involvement of mucus, bacteria, and TRPV1 in these phenomena. Mucin feeding reflected most of the effects produced by capsaicin, indicating that mucus modulation by capsaicin plays a crucial role in its anti-obesity effects. Capsaicin, bacteria and the host mucus system seem to act in a cyclic cascade involving TRPV1, which can be activated by capsaicin and various bacteria. These findings provide new insight into the role of TRPV1 in maintaining a healthy gut environment.HIGHLIGHTSExogenous mucin feeding produced anti-obesity effects similar to capsaicin in mice.Mucin and capsaicin improved TJP expression, intestinal permeability and gut microbial diversity.Capsaicin modulated bacterial diversity in vitro, independently of the host.Probiotic bacteria and butyrate activated TRPV1 in transfected HEK cells.Anti-obesity action of capsaicin is not exclusive to TRPV1 agonism.Capsaicin’s action as colonic mucus secretagogue – plays a crucial part in its anti-obesity benefits.

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“Raoultibacter massiliensis” gen. nov., sp. nov., a new bacterium isolated from the human gut of a Saudi Bedouin

Abstract: We propose the description of a new bacterial genus and new bacterial species, “Raoultibacter massiliensis,” isolated from a faecal specimen of a 19-year-old healthy Saudi Bedouin.

Cited by 8 publications

References 7 publications

‘Raoultibacter timonensis’ gen. nov., sp. nov. , a new bacterium isolated from the human gut of a Pygmy woman

‘Raoultibacter timonensis’ gen. nov., sp. nov. , a new bacterium isolated from the human gut of a Pygmy woman

High-Level Abundances ofMethanobacterialesandSyntrophobacteralesMay Help To Prevent Corrosion of Metal Sheet Piles

Mucin-mimetic action of capsaicin improves high fat diet-induced gut barrier dysfunction in mice colon

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