Characterization of an archaeal two-component system that regulates methanogenesis in Methanosaeta harundinacea.
Two-component signal transduction systems (TCSs) are a major mechanism used by bacteria in response to environmental changes. Although many sequenced archaeal genomes encode TCSs, they remain poorly understood. Previously, we reported that a methanogenic archaeon, Methanosaeta harundinacea, encodes...
| Main Authors: | , , , , |
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| Format: | Article |
| Language: | English |
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Public Library of Science (PLoS)
2014-01-01
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| Series: | PLoS ONE |
| Online Access: | http://europepmc.org/articles/PMC3991700?pdf=render |
| _version_ | 1819074910156226560 |
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| author | Jie Li Xin Zheng Xiaopeng Guo Lei Qi Xiuzhu Dong |
| author_facet | Jie Li Xin Zheng Xiaopeng Guo Lei Qi Xiuzhu Dong |
| author_sort | Jie Li |
| collection | DOAJ |
| description | Two-component signal transduction systems (TCSs) are a major mechanism used by bacteria in response to environmental changes. Although many sequenced archaeal genomes encode TCSs, they remain poorly understood. Previously, we reported that a methanogenic archaeon, Methanosaeta harundinacea, encodes FilI, which synthesizes carboxyl-acyl homoserine lactones, to regulate transitions of cellular morphology and carbon metabolic fluxes. Here, we report that filI, the cotranscribed filR2, and the adjacent filR1 constitute an archaeal TCS. FilI possesses a cytoplasmic kinase domain (histidine kinase A and histidine kinase-like ATPase) and its cognate response regulator. FilR1 carries a receiver (REC) domain coupled with an ArsR-related domain with potential DNA-binding ability, while FilR2 carries only a REC domain. In a phosphorelay assay, FilI was autophosphorylated and specifically transferred the phosphoryl group to FilR1 and FilR2, confirming that the three formed a cognate TCS. Through chromatin immunoprecipitation-quantitative polymerase chain reaction (ChIP-qPCR) using an anti-FilR1 antibody, FilR1 was shown to form in vivo associations with its own promoter and the promoter of the filI-filR2 operon, demonstrating a regulatory pattern common among TCSs. ChIP-qPCR also detected FilR1 associations with key genes involved in acetoclastic methanogenesis, acs4 and acs1. Electrophoretic mobility shift assays confirmed the in vitro tight binding of FilR1 to its own promoter and those of filI-filR2, acs4, and mtrABC. This also proves the DNA-binding ability of the ArsR-related domain, which is found primarily in Archaea. The archaeal promoters of acs4, filI, acs1, and mtrABC also initiated FilR1-modulated expression in an Escherichia coli lux reporter system, suggesting that FilR1 can up-regulate both archaeal and bacterial transcription. In conclusion, this work identifies an archaeal FilI/FilRs TCS that regulates the methanogenesis of M. harundinacea. |
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| id | doaj.art-021385aab6914188ab7f4abbd0ac551a |
| institution | Directory Open Access Journal |
| issn | 1932-6203 |
| language | English |
| last_indexed | 2024-12-21T18:17:01Z |
| publishDate | 2014-01-01 |
| publisher | Public Library of Science (PLoS) |
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| series | PLoS ONE |
| spelling | doaj.art-021385aab6914188ab7f4abbd0ac551a2022-12-21T18:54:38ZengPublic Library of Science (PLoS)PLoS ONE1932-62032014-01-0194e9550210.1371/journal.pone.0095502Characterization of an archaeal two-component system that regulates methanogenesis in Methanosaeta harundinacea.Jie LiXin ZhengXiaopeng GuoLei QiXiuzhu DongTwo-component signal transduction systems (TCSs) are a major mechanism used by bacteria in response to environmental changes. Although many sequenced archaeal genomes encode TCSs, they remain poorly understood. Previously, we reported that a methanogenic archaeon, Methanosaeta harundinacea, encodes FilI, which synthesizes carboxyl-acyl homoserine lactones, to regulate transitions of cellular morphology and carbon metabolic fluxes. Here, we report that filI, the cotranscribed filR2, and the adjacent filR1 constitute an archaeal TCS. FilI possesses a cytoplasmic kinase domain (histidine kinase A and histidine kinase-like ATPase) and its cognate response regulator. FilR1 carries a receiver (REC) domain coupled with an ArsR-related domain with potential DNA-binding ability, while FilR2 carries only a REC domain. In a phosphorelay assay, FilI was autophosphorylated and specifically transferred the phosphoryl group to FilR1 and FilR2, confirming that the three formed a cognate TCS. Through chromatin immunoprecipitation-quantitative polymerase chain reaction (ChIP-qPCR) using an anti-FilR1 antibody, FilR1 was shown to form in vivo associations with its own promoter and the promoter of the filI-filR2 operon, demonstrating a regulatory pattern common among TCSs. ChIP-qPCR also detected FilR1 associations with key genes involved in acetoclastic methanogenesis, acs4 and acs1. Electrophoretic mobility shift assays confirmed the in vitro tight binding of FilR1 to its own promoter and those of filI-filR2, acs4, and mtrABC. This also proves the DNA-binding ability of the ArsR-related domain, which is found primarily in Archaea. The archaeal promoters of acs4, filI, acs1, and mtrABC also initiated FilR1-modulated expression in an Escherichia coli lux reporter system, suggesting that FilR1 can up-regulate both archaeal and bacterial transcription. In conclusion, this work identifies an archaeal FilI/FilRs TCS that regulates the methanogenesis of M. harundinacea.http://europepmc.org/articles/PMC3991700?pdf=render |
| spellingShingle | Jie Li Xin Zheng Xiaopeng Guo Lei Qi Xiuzhu Dong Characterization of an archaeal two-component system that regulates methanogenesis in Methanosaeta harundinacea. PLoS ONE |
| title | Characterization of an archaeal two-component system that regulates methanogenesis in Methanosaeta harundinacea. |
| title_full | Characterization of an archaeal two-component system that regulates methanogenesis in Methanosaeta harundinacea. |
| title_fullStr | Characterization of an archaeal two-component system that regulates methanogenesis in Methanosaeta harundinacea. |
| title_full_unstemmed | Characterization of an archaeal two-component system that regulates methanogenesis in Methanosaeta harundinacea. |
| title_short | Characterization of an archaeal two-component system that regulates methanogenesis in Methanosaeta harundinacea. |
| title_sort | characterization of an archaeal two component system that regulates methanogenesis in methanosaeta harundinacea |
| url | http://europepmc.org/articles/PMC3991700?pdf=render |
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