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Hall AE, Engevik MA, Oezguen N, Haag A, Versalovic J. ClC transporter activity modulates histidine catabolism in Lactobacillus reuteri by altering intracellular pH and membrane potential. Microb Cell Fact 2019; 18:212. [PMID: 31830990 PMCID: PMC6909576 DOI: 10.1186/s12934-019-1264-0] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/04/2019] [Accepted: 12/02/2019] [Indexed: 02/07/2023] Open
Abstract
Background Histamine is a key mediator of the anti-inflammatory activity conferred by the probiotic organism Lactobacillus reuteri ATCC PTA 6475 in animal models of colitis and colorectal cancer. In L. reuteri, histamine synthesis and secretion requires l-histidine decarboxylase and a l-histidine/histamine exchanger. Chloride channel (ClC)-family proton/chloride antiporters have been proposed to act as electrochemical shunts in conjunction with amino acid decarboxylase systems, correcting ion imbalances generated by decarboxylation through fixed ratio exchange of two chloride ions for one proton. This family is unique among transporters by facilitating ion flux in either direction. Here we examine the histidine decarboxylase system in relation to ClC antiporters in the probiotic organism Lactobacillus reuteri. Results In silico analyses reveal that L. reuteri possesses two ClC transporters, EriC and EriC2, as well as a complete histidine decarboxylase gene cluster (HDC) for the synthesis and export of histamine. When the transport activity of either proton/chloride antiporter is disrupted by genetic manipulation, bacterial histamine output is reduced. Using fluorescent reporter assays, we further show that ClC transporters affect histamine output by altering intracellular pH and membrane potential. ClC transport also alters the expression and activity of two key HDC genes: the histidine decarboxylase (hdcA) and the histidine/histamine exchanger (hdcP). Conclusions Histamine production is a potentially beneficial feature for intestinal microbes by promoting long-term colonization and suppression of inflammation and host immune responses. ClC transporters may serve as tunable modulators for histamine production by L. reuteri and other gut microbes.
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Affiliation(s)
- Anne E Hall
- Department of Molecular Virology and Microbiology, Baylor College of Medicine, Houston, TX, 77030, USA.,Department of Pathology and Immunology, Baylor College of Medicine, Houston, TX, 77030, USA.,Department of Pathology, Texas Children's Hospital, Houston, TX, 77030, USA.,Infectious Disease Laboratories, Akron Children's Hospital, Akron, OH, 44308, USA
| | - Melinda A Engevik
- Department of Pathology and Immunology, Baylor College of Medicine, Houston, TX, 77030, USA.,Department of Pathology, Texas Children's Hospital, Houston, TX, 77030, USA
| | - Numan Oezguen
- Department of Pathology and Immunology, Baylor College of Medicine, Houston, TX, 77030, USA.,Department of Pathology, Texas Children's Hospital, Houston, TX, 77030, USA
| | - Anthony Haag
- Department of Pathology and Immunology, Baylor College of Medicine, Houston, TX, 77030, USA.,Department of Pathology, Texas Children's Hospital, Houston, TX, 77030, USA
| | - James Versalovic
- Department of Pathology and Immunology, Baylor College of Medicine, Houston, TX, 77030, USA. .,Department of Pathology, Texas Children's Hospital, Houston, TX, 77030, USA.
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Diaz M, del Rio B, Ladero V, Redruello B, Fernández M, Martin MC, Alvarez MA. Isolation and typification of histamine-producing Lactobacillus vaginalis strains from cheese. Int J Food Microbiol 2015; 215:117-23. [PMID: 26394683 DOI: 10.1016/j.ijfoodmicro.2015.08.026] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/13/2015] [Revised: 07/01/2015] [Accepted: 08/31/2015] [Indexed: 11/16/2022]
Abstract
In food, the biogenic amine (BA) histamine is mainly produced by histidine decarboxylation catalysed by microbial histidine decarboxylase. The consumption of foods containing high concentrations of histamine can trigger adverse neurological, gastrointestinal and respiratory reactions. Indeed, histamine is one of the most toxic of all BAs, and is often detected in high concentration in cheese. However, little is known about the microorganisms responsible for its accumulation in this food. In the present work, 25 histamine-producing Lactobacillus vaginalis strains were isolated from a blue-veined cheese (the first time that histamine-producing strains of this species have been isolated from any food). The restriction profiles of their genomes were analysed by PFGE, and seven lineages identified. The presence of the histidine decarboxylase gene (hdcA) was confirmed by PCR. The nucleotide sequence and genetic organisation of the histamine biosynthesis gene cluster (HDC) and its flanking regions are described for a representative strain (L. vaginalis IPLA11050).
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Affiliation(s)
- Maria Diaz
- Instituto de Productos Lácteos de Asturias, IPLA-CSIC, Paseo Rio Linares s/n, 33300 Villaviciosa, Spain
| | - Beatriz del Rio
- Instituto de Productos Lácteos de Asturias, IPLA-CSIC, Paseo Rio Linares s/n, 33300 Villaviciosa, Spain
| | - Victor Ladero
- Instituto de Productos Lácteos de Asturias, IPLA-CSIC, Paseo Rio Linares s/n, 33300 Villaviciosa, Spain
| | - Begoña Redruello
- Instituto de Productos Lácteos de Asturias, IPLA-CSIC, Paseo Rio Linares s/n, 33300 Villaviciosa, Spain
| | - María Fernández
- Instituto de Productos Lácteos de Asturias, IPLA-CSIC, Paseo Rio Linares s/n, 33300 Villaviciosa, Spain
| | - Maria Cruz Martin
- Instituto de Productos Lácteos de Asturias, IPLA-CSIC, Paseo Rio Linares s/n, 33300 Villaviciosa, Spain.
| | - Miguel A Alvarez
- Instituto de Productos Lácteos de Asturias, IPLA-CSIC, Paseo Rio Linares s/n, 33300 Villaviciosa, Spain
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