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Metagenomes and metatranscriptomes of the dechlorinating enrichments with and without exogenous cobalamin were compared. Seven putative draft genomes were binned from the metagenomes. At an early stage (2 days), more transcripts of genes in the\n            <jats:named-content content-type=\"genus-species\">Veillonellaceae<\/jats:named-content>\n            bin-genome were detected in the metatranscriptome of the enrichment without exogenous cobalamin than in the one with the addition of cobalamin. Among these genes, sporulation-related genes exhibited the highest differential expression when cobalamin was not added, suggesting a possible release route of corrinoids from corrinoid producers. Other differentially expressed genes include those involved in energy conservation and nutrient transport (including cobalt transport). The most highly expressed corrinoid\n            <jats:italic>de novo<\/jats:italic>\n            biosynthesis pathway was also assigned to the\n            <jats:named-content content-type=\"genus-species\">Veillonellaceae<\/jats:named-content>\n            bin-genome. Targeted quantitative PCR (qPCR) analyses confirmed higher transcript abundances of those corrinoid biosynthesis genes in the enrichment without exogenous cobalamin than in the enrichment with cobalamin. Furthermore, the corrinoid salvaging and modification pathway of\n            <jats:named-content content-type=\"genus-species\">Dehalococcoides<\/jats:named-content>\n            was upregulated in response to the cobalamin stress. This study provides important insights into the microbial interactions and roles played by members of dechlorinating communities under cobalamin-limited conditions.\n          <\/jats:p>\n          <jats:p>\n            <jats:bold>IMPORTANCE<\/jats:bold>\n            The key chloroethene-dechlorinating bacterium\n            <jats:named-content content-type=\"genus-species\">Dehalococcoides mccartyi<\/jats:named-content>\n            is a cobalamin auxotroph, thus acquiring corrinoids from other community members. Therefore, it is important to investigate the microbe-microbe interactions between\n            <jats:named-content content-type=\"genus-species\">Dehalococcoides<\/jats:named-content>\n            and the corrinoid-providing microorganisms in a community. This study provides systems-level information, i.e., taxonomic and functional compositions and dynamics of the supportive microorganisms in dechlorinating communities under different cobalamin conditions. The findings shed light on the important roles of\n            <jats:named-content content-type=\"genus-species\">Veillonellaceae<\/jats:named-content>\n            species in the communities compared to other coexisting community members in producing and providing corrinoids for\n            <jats:named-content content-type=\"genus-species\">Dehalococcoides<\/jats:named-content>\n            species under cobalamin-limited conditions.\n          <\/jats:p>","DOI":"10.1128\/aem.03508-16","type":"journal-article","created":{"date-parts":[[2017,2,11]],"date-time":"2017-02-11T01:40:24Z","timestamp":1486777224000},"update-policy":"https:\/\/doi.org\/10.1128\/asmj-crossmark-policy-page","source":"Crossref","is-referenced-by-count":34,"title":["Metagenomic and Metatranscriptomic Analyses Reveal the Structure and Dynamics of a Dechlorinating Community Containing Dehalococcoides mccartyi and Corrinoid-Providing Microorganisms under Cobalamin-Limited Conditions"],"prefix":"10.1128","volume":"83","author":[{"given":"Yujie","family":"Men","sequence":"first","affiliation":[{"name":"Department of Civil and Environmental Engineering, University of California, Berkeley, Berkeley, California, USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Ke","family":"Yu","sequence":"additional","affiliation":[{"name":"Department of Civil and Environmental Engineering, University of California, Berkeley, Berkeley, California, USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Jacob","family":"B\u00e6lum","sequence":"additional","affiliation":[{"name":"Earth Science Division, Lawrence Berkeley National Laboratory, Berkeley, California, USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Ying","family":"Gao","sequence":"additional","affiliation":[{"name":"Department of Civil and Environmental Engineering, University of California, Berkeley, Berkeley, California, USA"},{"name":"School of Environment, 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