Roles of Organohalide-Respiring <italic toggle="yes">Dehalococcoidia</italic> in Carbon Cycling

ABSTRACT The class Dehalococcoidia within the Chloroflexi phylum comprises the obligate organohalide-respiring genera Dehalococcoides, Dehalogenimonas, and “Candidatus Dehalobium.” Knowledge of the unique ecophysiology and biochemistry of Dehalococcoidia has been largely derived from studies with en...

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Autores principales:	Yi Yang, Robert Sanford, Jun Yan, Gao Chen, Natalie L. Cápiro, Xiuying Li, Frank E. Löffler
Formato:	article
Lenguaje:	EN
Publicado:	American Society for Microbiology 2020
Materias:	Dehalococcoidia carbon cycling hydrogen thresholds organohalide respiration syntrophy thermodynamics Microbiology QR1-502
Acceso en línea:	https://doaj.org/article/b93d4c8b4f6d482792f68808dfd3249c
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spelling	oai:doaj.org-article:b93d4c8b4f6d482792f68808dfd3249c2021-12-02T18:44:38ZRoles of Organohalide-Respiring <italic toggle="yes">Dehalococcoidia</italic> in Carbon Cycling10.1128/mSystems.00757-192379-5077https://doaj.org/article/b93d4c8b4f6d482792f68808dfd3249c2020-06-01T00:00:00Zhttps://journals.asm.org/doi/10.1128/mSystems.00757-19https://doaj.org/toc/2379-5077ABSTRACT The class Dehalococcoidia within the Chloroflexi phylum comprises the obligate organohalide-respiring genera Dehalococcoides, Dehalogenimonas, and “Candidatus Dehalobium.” Knowledge of the unique ecophysiology and biochemistry of Dehalococcoidia has been largely derived from studies with enrichment cultures and isolates from sites impacted with chlorinated pollutants; however, culture-independent surveys found Dehalococcoidia sequences in marine, freshwater, and terrestrial biomes considered to be pristine (i.e., not impacted with organohalogens of anthropogenic origin). The broad environmental distribution of Dehalococcoidia, as well as other organohalide-respiring bacteria, supports the concept of active halogen cycling and the natural formation of organohalogens in various ecosystems. Dechlorination reduces recalcitrance and renders organics susceptible to metabolic oxidation by diverse microbial taxa. During reductive dechlorination, hydrogenotrophic organohalide-respiring bacteria, in particular Dehalococcoidia, can consume hydrogen to low consumption threshold concentrations (<0.3 nM) and enable syntrophic oxidation processes. These functional attributes and the broad distribution imply that Dehalococcoidia play relevant roles in carbon cycling in anoxic ecosystems.Yi YangRobert SanfordJun YanGao ChenNatalie L. CápiroXiuying LiFrank E. LöfflerAmerican Society for MicrobiologyarticleDehalococcoidiacarbon cyclinghydrogen thresholdsorganohalide respirationsyntrophythermodynamicsMicrobiologyQR1-502ENmSystems, Vol 5, Iss 3 (2020)
institution	DOAJ
collection	DOAJ
language	EN
topic	Dehalococcoidia carbon cycling hydrogen thresholds organohalide respiration syntrophy thermodynamics Microbiology QR1-502
spellingShingle	Dehalococcoidia carbon cycling hydrogen thresholds organohalide respiration syntrophy thermodynamics Microbiology QR1-502 Yi Yang Robert Sanford Jun Yan Gao Chen Natalie L. Cápiro Xiuying Li Frank E. Löffler Roles of Organohalide-Respiring <italic toggle="yes">Dehalococcoidia</italic> in Carbon Cycling
description	ABSTRACT The class Dehalococcoidia within the Chloroflexi phylum comprises the obligate organohalide-respiring genera Dehalococcoides, Dehalogenimonas, and “Candidatus Dehalobium.” Knowledge of the unique ecophysiology and biochemistry of Dehalococcoidia has been largely derived from studies with enrichment cultures and isolates from sites impacted with chlorinated pollutants; however, culture-independent surveys found Dehalococcoidia sequences in marine, freshwater, and terrestrial biomes considered to be pristine (i.e., not impacted with organohalogens of anthropogenic origin). The broad environmental distribution of Dehalococcoidia, as well as other organohalide-respiring bacteria, supports the concept of active halogen cycling and the natural formation of organohalogens in various ecosystems. Dechlorination reduces recalcitrance and renders organics susceptible to metabolic oxidation by diverse microbial taxa. During reductive dechlorination, hydrogenotrophic organohalide-respiring bacteria, in particular Dehalococcoidia, can consume hydrogen to low consumption threshold concentrations (<0.3 nM) and enable syntrophic oxidation processes. These functional attributes and the broad distribution imply that Dehalococcoidia play relevant roles in carbon cycling in anoxic ecosystems.
format	article
author	Yi Yang Robert Sanford Jun Yan Gao Chen Natalie L. Cápiro Xiuying Li Frank E. Löffler
author_facet	Yi Yang Robert Sanford Jun Yan Gao Chen Natalie L. Cápiro Xiuying Li Frank E. Löffler
author_sort	Yi Yang
title	Roles of Organohalide-Respiring <italic toggle="yes">Dehalococcoidia</italic> in Carbon Cycling
title_short	Roles of Organohalide-Respiring <italic toggle="yes">Dehalococcoidia</italic> in Carbon Cycling
title_full	Roles of Organohalide-Respiring <italic toggle="yes">Dehalococcoidia</italic> in Carbon Cycling
title_fullStr	Roles of Organohalide-Respiring <italic toggle="yes">Dehalococcoidia</italic> in Carbon Cycling
title_full_unstemmed	Roles of Organohalide-Respiring <italic toggle="yes">Dehalococcoidia</italic> in Carbon Cycling
title_sort	roles of organohalide-respiring <italic toggle="yes">dehalococcoidia</italic> in carbon cycling
publisher	American Society for Microbiology
publishDate	2020
url	https://doaj.org/article/b93d4c8b4f6d482792f68808dfd3249c
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Roles of Organohalide-Respiring <italic toggle="yes">Dehalococcoidia</italic> in Carbon Cycling

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