2022
DOI: 10.1146/annurev-micro-111021-045911
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Anaerobic Degradation of Alkanes by Marine Archaea

Abstract: Alkanes are saturated apolar hydrocarbons that range from its simplest form, methane, to high-molecular-weight compounds. Although alkanes were once considered biologically recalcitrant under anaerobic conditions, microbiological investigations have now identified several microbial taxa that can anaerobically degrade alkanes. Here we review recent discoveries in the anaerobic oxidation of alkanes with a specific focus on archaea that use specific methyl coenzyme M reductases to activate their substrates. Our u… Show more

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Cited by 36 publications
(21 citation statements)
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“…The presence of multiple porin:cytochrome c conduits in the syntrophic partners suggests some flexibility in use of electron donors, possibly from different syntrophic partners. For HotSeep-1, this observation is consistent with its ability to form partnerships with both methane and other alkane-oxidizing archaea[55]. The role of the second conduit is less clear in Seep-SRB1g which to date has only been shown to partner with ANME-2b, and currently lacks representation in enrichment cultures[14].…”
Section: Resultsmentioning
confidence: 79%
“…The presence of multiple porin:cytochrome c conduits in the syntrophic partners suggests some flexibility in use of electron donors, possibly from different syntrophic partners. For HotSeep-1, this observation is consistent with its ability to form partnerships with both methane and other alkane-oxidizing archaea[55]. The role of the second conduit is less clear in Seep-SRB1g which to date has only been shown to partner with ANME-2b, and currently lacks representation in enrichment cultures[14].…”
Section: Resultsmentioning
confidence: 79%
“…Alkanophaga do not possess MHCs, which are often considered a central element in DIET between syntrophic partners 54 . All other syntrophic alkane-oxidizing archaea code for several MHCs 72 . However, a lack of MHCs in DIET-performing methanogenic Methanosarcinales has been recognized before 63 .…”
Section: Discussionmentioning
confidence: 99%
“…The functions of the morphologically diverse OMVs observed in the environmental Desulfobacterota here remain unknown but may be a common feature in the syntrophic bacterial partners of ANME archaea, as they were also observed in the ANME-SRB mats in the Black Sea ( 72 ). In the context of the involvement of these syntrophic SRB in direct extracellular electron transfer with ANME archaea ( 34 , 73 ), it is notable that metal-reducing Shewanella produce redox active OMV’s ( 74 ) and have recently been shown to engage in extracellular electron transfer via periplasmic extensions of the outer membrane ( 75 ). The molecular mechanisms for selecting the cargo to be inserted into the OMVs are not well-understood ( 76 ), but a key factor may be the oxidation of the cargo ( 77 ).…”
Section: Discussionmentioning
confidence: 99%