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Zhang Y, Wei S, Zhang H, Jo Y, Kang JS, Ha KT, Joo J, Lee HJ, Ryu D. Gut microbiota-generated metabolites: missing puzzles to hosts' health, diseases, and aging. BMB Rep 2024; 57:207-215. [PMID: 38627947 PMCID: PMC11139682] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/17/2023] [Revised: 03/07/2024] [Accepted: 03/20/2024] [Indexed: 05/25/2024] Open
Abstract
The gut microbiota, an intricate community of bacteria residing in the gastrointestinal system, assumes a pivotal role in various physiological processes. Beyond its function in food breakdown and nutrient absorption, gut microbiota exerts a profound influence on immune and metabolic modulation by producing diverse gut microbiota-generated metabolites (GMGMs). These small molecules hold potential to impact host health via multiple pathways, which exhibit remarkable diversity, and have gained increasing attention in recent studies. Here, we elucidate the intricate implications and significant impacts of four specific metabolites, Urolithin A (UA), equol, Trimethylamine N-oxide (TMAO), and imidazole propionate, in shaping human health. Meanwhile, we also look into the advanced research on GMGMs, which demonstrate promising curative effects and hold great potential for further clinical therapies. Notably, the emergence of positive outcomes from clinical trials involving GMGMs, typified by UA, emphasizes their promising prospects in the pursuit of improved health and longevity. Collectively, the multifaceted impacts of GMGMs present intriguing avenues for future research and therapeutic interventions. [BMB Reports 2024; 57(5): 207-215].
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Affiliation(s)
- Yan Zhang
- Department of Molecular Cell Biology, Single Cell Network Research Center, Sungkyunkwan University, Suwon 16419, Korea
| | - Shibo Wei
- Department of Biomedical Science and Engineering, Gwangju Institute of Science and Technology (GIST), Gwangju 61005, Korea, Busan 49241, Korea
| | - Hang Zhang
- Department of Hepatobiliary and Pancreatic Surgery, The Second Hospital of Jilin University, Changchun 130041, China, Busan 49241, Korea
| | - Yunju Jo
- Department of Biomedical Science and Engineering, Gwangju Institute of Science and Technology (GIST), Gwangju 61005, Korea, Busan 49241, Korea
| | - Jong-Sun Kang
- Department of Molecular Cell Biology, Single Cell Network Research Center, Sungkyunkwan University, Suwon 16419, Korea
| | - Ki-Tae Ha
- Department of Korean Medical Science, School of Korean Medicine, Pusan National University, Yangsan 50612, Korea
| | - Jongkil Joo
- Department of Obstetrics and Gynecology, Pusan National University Hospital, Busan 49241, Korea
| | - Hyun Joo Lee
- Department of Obstetrics and Gynecology, Pusan National University Hospital, Busan 49241, Korea
| | - Dongryeol Ryu
- Department of Biomedical Science and Engineering, Gwangju Institute of Science and Technology (GIST), Gwangju 61005, Korea, Busan 49241, Korea
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Delavari N, Zhang Z, Stull F. Rapid reaction studies on the chemistry of flavin oxidation in urocanate reductase. J Biol Chem 2024; 300:105689. [PMID: 38280427 PMCID: PMC10882135 DOI: 10.1016/j.jbc.2024.105689] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/14/2023] [Revised: 01/19/2024] [Accepted: 01/21/2024] [Indexed: 01/29/2024] Open
Abstract
Urocanate reductase (UrdA) is a bacterial flavin-dependent enzyme that reduces urocanate to imidazole propionate, enabling bacteria to use urocanate as an alternative respiratory electron acceptor. Elevated serum levels of imidazole propionate are associated with the development of type 2 diabetes, and, since UrdA is only present in humans in gut bacteria, this enzyme has emerged as a significant factor linking the health of the gut microbiome and insulin resistance. Here, we investigated the chemistry of flavin oxidation by urocanate in the isolated FAD domain of UrdA (UrdA') using anaerobic stopped-flow experiments. This analysis unveiled the presence of a charge-transfer complex between reduced FAD and urocanate that forms within the dead time of the stopped-flow instrument (∼1 ms), with flavin oxidation subsequently occurring with a rate constant of ∼60 s-1. The pH dependence of the reaction and analysis of an Arg411Ala mutant of UrdA' are consistent with Arg411 playing a crucial role in catalysis by serving as the active site acid that protonates urocanate during hydride transfer from reduced FAD. Mutational analysis of urocanate-binding residues suggests that the twisted conformation of urocanate imposed by the active site of UrdA' facilitates urocanate reduction. Overall, this study provides valuable insight into the mechanism of urocanate reduction by UrdA.
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Affiliation(s)
- Niusha Delavari
- Department of Chemistry, Western Michigan University, Kalamazoo, Michigan, USA
| | - Zhiyao Zhang
- Department of Chemistry, Western Michigan University, Kalamazoo, Michigan, USA
| | - Frederick Stull
- Department of Chemistry, Western Michigan University, Kalamazoo, Michigan, USA.
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