Regulation of Erwinia carotovora hrpLEcc (sigma-LEcc), Which Encodes an Extracytoplasmic Function Subfamily of Sigma Factor Required for Expression of the HRP Regulon
In Erwinia carotovora subsp. carotovora (Ecc) strain 71 (Ecc71), HrpLEcc, an alternate sigma factor of the extracytoplasmic function subfamily, plays a central role in the expression of the hrp (hypersensitive reaction and pathogenicity) regulon. We document here that sigma-54 (RpoN) is required for...
| Main Authors: | , , |
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| Format: | Article |
| Language: | English |
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The American Phytopathological Society
2002-09-01
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| Series: | Molecular Plant-Microbe Interactions |
| Online Access: | https://apsjournals.apsnet.org/doi/10.1094/MPMI.2002.15.9.971 |
| _version_ | 1818669107964280832 |
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| author | Asita Chatterjee Yaya Cui Arun K. Chatterjee |
| author_facet | Asita Chatterjee Yaya Cui Arun K. Chatterjee |
| author_sort | Asita Chatterjee |
| collection | DOAJ |
| description | In Erwinia carotovora subsp. carotovora (Ecc) strain 71 (Ecc71), HrpLEcc, an alternate sigma factor of the extracytoplasmic function subfamily, plays a central role in the expression of the hrp (hypersensitive reaction and pathogenicity) regulon. We document here that sigma-54 (RpoN) is required for full expression of hrpLEcc and that HrpS, in conjunction with sigma-54, activates hrpLEcc transcription. We also made the novel observation that integration host factor is required for the activation of the hrpLEcc promoter. Our findings reveal that the RsmA/rsmB RNA-mediated post-transcriptional system, known to control ex-tracellular enzyme and harpin production, affects hrpLEcc expression as well. For example, hrpLEcc RNA levels are barely detected in an RsmB- strain. Conversely, hrpLEcc mRNA levels are much higher in RsmA- bacteria than in the RsmA+ parent. This effect is due to RsmA-promoted decay of hrpLEcc RNA. Moreover, the following regulators known to control the production of either RsmA, rsmB RNA, or both also affect hrpLEcc expression: GacA (response regulator of a two-component system), KdgR (an IclI type repressor), HexA (a LysR type repressor), RsmC (a putative transcriptional adapter). Based upon the data now available for Ecc and extrapolating from the evidence in other systems, we propose a tentative model that depicts the Hrp regulatory system of Ecc and explains the basis for coregulation of extracellular enzyme production and expression of the Hrp regulon. |
| first_indexed | 2024-12-17T06:46:58Z |
| format | Article |
| id | doaj.art-73a49bd1a9f5452c947aa6122adec04f |
| institution | Directory Open Access Journal |
| issn | 0894-0282 1943-7706 |
| language | English |
| last_indexed | 2024-12-17T06:46:58Z |
| publishDate | 2002-09-01 |
| publisher | The American Phytopathological Society |
| record_format | Article |
| series | Molecular Plant-Microbe Interactions |
| spelling | doaj.art-73a49bd1a9f5452c947aa6122adec04f2022-12-21T21:59:43ZengThe American Phytopathological SocietyMolecular Plant-Microbe Interactions0894-02821943-77062002-09-0115997198010.1094/MPMI.2002.15.9.971Regulation of Erwinia carotovora hrpLEcc (sigma-LEcc), Which Encodes an Extracytoplasmic Function Subfamily of Sigma Factor Required for Expression of the HRP RegulonAsita ChatterjeeYaya CuiArun K. ChatterjeeIn Erwinia carotovora subsp. carotovora (Ecc) strain 71 (Ecc71), HrpLEcc, an alternate sigma factor of the extracytoplasmic function subfamily, plays a central role in the expression of the hrp (hypersensitive reaction and pathogenicity) regulon. We document here that sigma-54 (RpoN) is required for full expression of hrpLEcc and that HrpS, in conjunction with sigma-54, activates hrpLEcc transcription. We also made the novel observation that integration host factor is required for the activation of the hrpLEcc promoter. Our findings reveal that the RsmA/rsmB RNA-mediated post-transcriptional system, known to control ex-tracellular enzyme and harpin production, affects hrpLEcc expression as well. For example, hrpLEcc RNA levels are barely detected in an RsmB- strain. Conversely, hrpLEcc mRNA levels are much higher in RsmA- bacteria than in the RsmA+ parent. This effect is due to RsmA-promoted decay of hrpLEcc RNA. Moreover, the following regulators known to control the production of either RsmA, rsmB RNA, or both also affect hrpLEcc expression: GacA (response regulator of a two-component system), KdgR (an IclI type repressor), HexA (a LysR type repressor), RsmC (a putative transcriptional adapter). Based upon the data now available for Ecc and extrapolating from the evidence in other systems, we propose a tentative model that depicts the Hrp regulatory system of Ecc and explains the basis for coregulation of extracellular enzyme production and expression of the Hrp regulon.https://apsjournals.apsnet.org/doi/10.1094/MPMI.2002.15.9.971 |
| spellingShingle | Asita Chatterjee Yaya Cui Arun K. Chatterjee Regulation of Erwinia carotovora hrpLEcc (sigma-LEcc), Which Encodes an Extracytoplasmic Function Subfamily of Sigma Factor Required for Expression of the HRP Regulon Molecular Plant-Microbe Interactions |
| title | Regulation of Erwinia carotovora hrpLEcc (sigma-LEcc), Which Encodes an Extracytoplasmic Function Subfamily of Sigma Factor Required for Expression of the HRP Regulon |
| title_full | Regulation of Erwinia carotovora hrpLEcc (sigma-LEcc), Which Encodes an Extracytoplasmic Function Subfamily of Sigma Factor Required for Expression of the HRP Regulon |
| title_fullStr | Regulation of Erwinia carotovora hrpLEcc (sigma-LEcc), Which Encodes an Extracytoplasmic Function Subfamily of Sigma Factor Required for Expression of the HRP Regulon |
| title_full_unstemmed | Regulation of Erwinia carotovora hrpLEcc (sigma-LEcc), Which Encodes an Extracytoplasmic Function Subfamily of Sigma Factor Required for Expression of the HRP Regulon |
| title_short | Regulation of Erwinia carotovora hrpLEcc (sigma-LEcc), Which Encodes an Extracytoplasmic Function Subfamily of Sigma Factor Required for Expression of the HRP Regulon |
| title_sort | regulation of erwinia carotovora hrplecc sigma lecc which encodes an extracytoplasmic function subfamily of sigma factor required for expression of the hrp regulon |
| url | https://apsjournals.apsnet.org/doi/10.1094/MPMI.2002.15.9.971 |
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