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Chen C, Huang Z, Ge C, Yu H, Yuan H, Tian H. Regulation of the pleiotropic transcriptional regulator CodY on the conversion of branched-chain amino acids into branched-chain aldehydes in Lactococcus lactis. Appl Environ Microbiol 2023; 89:e0149323. [PMID: 37943058 PMCID: PMC10686057 DOI: 10.1128/aem.01493-23] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/14/2023] [Accepted: 10/17/2023] [Indexed: 11/10/2023] Open
Abstract
IMPORTANCE Branched-chain aldehydes are the primary compounds that contribute to the nutty flavor in cheddar cheese. Lactococcus lactis, which is often applied as primary starter culture, is a significant contributor to the nutty flavor of cheddar cheese due to its ability of conversion of BCAAs into branched-chain aldehydes. In the present study, we found that the regulatory role of CodY is crucial for the conversion. CodY acts as a pleiotropic transcriptional regulator via binding to various regulatory regions of key genes. The results presented valuable knowledge into the role of CodY on the regulation and biosynthetic pathway of branched-chain amino acids and the related aldehydes. Furthermore, it provided new insight for increasing the nutty flavor produced during the manufacture and ripening of cheese.
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Affiliation(s)
- Chen Chen
- School of Perfume and Aroma Technology, Shanghai Institute of Technology, Shanghai, China
| | - Zhiyang Huang
- School of Perfume and Aroma Technology, Shanghai Institute of Technology, Shanghai, China
| | - Chang Ge
- School of Perfume and Aroma Technology, Shanghai Institute of Technology, Shanghai, China
| | - Haiyan Yu
- School of Perfume and Aroma Technology, Shanghai Institute of Technology, Shanghai, China
| | - Haibin Yuan
- School of Perfume and Aroma Technology, Shanghai Institute of Technology, Shanghai, China
| | - Huaixiang Tian
- School of Perfume and Aroma Technology, Shanghai Institute of Technology, Shanghai, China
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Schober L, Dobiašová H, Jurkaš V, Parmeggiani F, Rudroff F, Winkler M. Enzymatic reactions towards aldehydes: An overview. FLAVOUR FRAG J 2023; 38:221-242. [PMID: 38505272 PMCID: PMC10947199 DOI: 10.1002/ffj.3739] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/23/2022] [Revised: 03/01/2023] [Accepted: 03/06/2023] [Indexed: 03/21/2024]
Abstract
Many aldehydes are volatile compounds with distinct and characteristic olfactory properties. The aldehydic functional group is reactive and, as such, an invaluable chemical multi-tool to make all sorts of products. Owing to the reactivity, the selective synthesis of aldehydic is a challenging task. Nature has evolved a number of enzymatic reactions to produce aldehydes, and this review provides an overview of aldehyde-forming reactions in biological systems and beyond. Whereas some of these biotransformations are still in their infancy in terms of synthetic applicability, others are developed to an extent that allows their implementation as industrial biocatalysts.
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Affiliation(s)
- Lukas Schober
- Institute of Molecular BiotechnologyGraz University of TechnologyGrazAustria
| | - Hana Dobiašová
- Institute of Chemical and Environmental EngineeringSlovak University of TechnologyBratislavaSlovakia
| | - Valentina Jurkaš
- Institute of Molecular BiotechnologyGraz University of TechnologyGrazAustria
| | - Fabio Parmeggiani
- Dipartimento di Chimica, Materiali ed Ingegneria Chimica “Giulio Natta”Politecnico di MilanoMilanItaly
| | - Florian Rudroff
- Institute of Applied Synthetic ChemistryTU WienViennaAustria
| | - Margit Winkler
- Institute of Molecular BiotechnologyGraz University of TechnologyGrazAustria
- Area BiotransformationsAustrian Center of Industrial BiotechnologyGrazAustria
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Chen C, Yuan J, Yu H, Lou X, Wang B, Xu Z, Tian H. Cloning, purification, and characterization of branched-chain α-keto acid decarboxylases from Lactococcus lactis strains with different 3-methylbutanal production abilities. FOOD BIOSCI 2022. [DOI: 10.1016/j.fbio.2022.101713] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
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Mikami N, Toyotome T, Takaya M, Tamura K. Direct Rub Inoculation of Fungal Flora Changes Fatty Acid Composition and Volatile Flavors in Dry-Aged Beef: A Preliminary Study. Animals (Basel) 2022; 12:1391. [PMID: 35681855 PMCID: PMC9179644 DOI: 10.3390/ani12111391] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/26/2022] [Revised: 05/21/2022] [Accepted: 05/23/2022] [Indexed: 11/17/2022] Open
Abstract
Here, we established a method to produce dry-aged beef (DAB) by rub inoculation with fungal flora on the prepared DAB surface. Portions of Holstein steers’ rumps were prepared by direct rub inoculation of fungal flora or without treatment (conventional DAB) and dry-aged for 26 days in an aging room at 2.9 °C and 90% relative humidity. We compared the fungal covering and meat quality, including fatty acid composition and volatile aromatic compounds, of fungal-inoculated DAB with those of the conventional DAB. The fungal-inoculated DAB was almost entirely covered with white mold, in contrast to the conventional DAB. Moreover, the proportion of oleic acid and the concentration of nine volatile compounds significantly increased in the raw meat of fungal-inoculated DAB compared with those in the conventional DAB (p < 0.05). These results suggested that direct rub inoculation of fungal flora from prepared DAB may accelerate DAB production and efficiently enhance the “melt-in-the-mouth” feeling and flavors of DAB.
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Affiliation(s)
- Nana Mikami
- Department of Life and Food Sciences, Obihiro University of Agriculture and Veterinary Medicine, Obihiro 080-8555, Hokkaido, Japan
| | - Takahito Toyotome
- Department of Veterinary Medicine, Obihiro University of Agriculture and Veterinary Medicine, Obihiro 080-8555, Hokkaido, Japan;
- Diagnostic Center for Animal Health and Food Safety, Obihiro University of Agriculture and Veterinary Medicine, Obihiro 080-8555, Hokkaido, Japan
- Medical Mycology Research Center, Chiba University, Chiba 260-8673, Japan
| | | | - Kenichi Tamura
- Kitaichi Meat Co., Ltd., Sapporo 007-0826, Hokkaido, Japan;
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Chen C, Yuan J, Yu H, Wang B, Huang J, Yuan H, Xu Z, Zhao S, Tian H. Characterization of metabolic pathways for biosynthesis of the flavor compound 3-methylbutanal by Lactococcus lactis. J Dairy Sci 2021; 105:97-108. [PMID: 34756442 DOI: 10.3168/jds.2021-20779] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/24/2021] [Accepted: 09/06/2021] [Indexed: 11/19/2022]
Abstract
3-Methylbutanal is a key volatile compound that imparts a nutty flavor to Cheddar cheese. Lactococcus lactis has been successfully applied as a starter to increase the level of 3-methylbutanal produced during the ripening of cheese. However, the mechanism of action and genetic diversity of this bacterium for 3-methylbutanal biosynthesis remains unclear. In this study, we investigated the association between the L. lactis genotype and phenotype in the biosynthesis of 3-methylbutanal via both direct and indirect pathways. Fourteen strains of L. lactis were screened for the capacity to produce 3-methylbutanal, and strain 408 (>140 μM) produced the highest among all tested strains, which exhibited both α-keto acid decarboxylase and α-ketoacid dehydrogenase activities. Furthermore, the results of a sodium meta-arsenite inhibition experiment showed that the 3-methylbutanal-producing capacities of each strain declined to various degrees. The kdcA gene, which encodes the direct pathway component α-ketoacid decarboxylase, was detected in 4 of the 14 strains, of which only strain 408 contained the full-length gene. We then characterized the genes associated with the indirect pathway by detecting the expression levels of the pdh gene cluster, ack, and pta, which were expressed at relatively higher levels in a high-yield strain than in a low-yield strain. As a result, these L. lactis strains were divided into 3 categories according to gene diversity, gene expression, and 3-methylbutanal production. The results of this study refine our knowledge of the genetic determinants of 3-methylbutanal biosynthesis in L. lactis and explain the effect of both synthesis pathways on 3-methylbutanal production.
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Affiliation(s)
- Chen Chen
- School of Perfume and Aroma Technology, Shanghai Institute of Technology, Shanghai 201418, P.R. China
| | - Jiajie Yuan
- School of Perfume and Aroma Technology, Shanghai Institute of Technology, Shanghai 201418, P.R. China
| | - Haiyan Yu
- School of Perfume and Aroma Technology, Shanghai Institute of Technology, Shanghai 201418, P.R. China
| | - Bei Wang
- School of Food and Health, Beijing Technology and Business University, Beijing 100048, P.R. China
| | - Juan Huang
- School of Perfume and Aroma Technology, Shanghai Institute of Technology, Shanghai 201418, P.R. China
| | - Haibin Yuan
- School of Perfume and Aroma Technology, Shanghai Institute of Technology, Shanghai 201418, P.R. China
| | - Zhiyuan Xu
- State Key Laboratory of Dairy Biotechnology, Shanghai Engineering Research Center of Dairy Biotechnology, Dairy Research Institute, Bright Dairy & Food Co., Ltd., Shanghai 201418, P.R. China
| | - Shanshan Zhao
- College of Agriculture, Hebei University of Engineering, Handan 056038, P.R. China.
| | - Huaixiang Tian
- School of Perfume and Aroma Technology, Shanghai Institute of Technology, Shanghai 201418, P.R. China.
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Meng HY, Piccand M, Fuchsmann P, Dubois S, Baumeyer A, Tena Stern M, von Ah U. Formation of 3-Methylbutanal and 3-Methylbutan-1-ol Recognized as Malty during Fermentation in Swiss Raclette-Type Cheese, Reconstituted Milk, and de Man, Rogosa, and Sharpe Broth. JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY 2021; 69:717-729. [PMID: 33406836 DOI: 10.1021/acs.jafc.0c06570] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/12/2023]
Abstract
This work aimed to determine the formation over time of 3-methylbutanal and 3-methylbutan-1-ol recognized as malty during the manufacture of Raclette-type cheese and the fermention of reconstituted skim milk, and filter-sterilized MRS broth. Using dynamic headspace-vacuum transfer in trap extraction followed by gas chromatography coupled with mass spectrometry-olfactometry (DHS-VTT-GC-MS-O) as a screening method for the malty compounds, five compounds (2-methylpropanal, 2- and 3-methylbutanal, and 2- and 3-methylbutan-1-ol) were identified as potential compounds causing the malty aroma in starter culture development and Raclette-type cheeses. Focus on compounds having a predominant sensorial effect (3-methylbutanal and 3-methylbutan-1-ol), spikings of leucine, 13C-labeled leucine, α-ketoisocaproic acid, and α-ketoglutaric acid provided a better understanding of their formation pathway. This study highlighted the discrepancies in the formation of 3-methylbutanal and 3-methylbutan-1-ol between the growth media; namely, despite the presence of free leucine available in MRS and the addition of an excess, no increase of the target compounds was observed. The concentration of these compounds in MRS increased only when α-ketoglutaric acid or α-ketoisocaproic acid was added, and a preference for the pathway to α-hydroxyisocaproic acid instead of 3-methylbutanal was shown. In addition, a formation of 3-methylbutanal when the bacteria were not yet active was observed when spiking α-ketoisocaproic acid, which potentially indicates that this part of the metabolism could take place extracellularly. These results could potentially unveil other, not-yet-identified reactants, directly influencing the production of compounds responsible for the malty aroma in Raclette cheese.
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Affiliation(s)
- Hélène Yi Meng
- Agroscope, Federal Department of Economic Affairs, Education and Research (EAER), 3003 Bern, Switzerland
| | | | - Pascal Fuchsmann
- Agroscope, Federal Department of Economic Affairs, Education and Research (EAER), 3003 Bern, Switzerland
| | - Sébastien Dubois
- Agroscope, Federal Department of Economic Affairs, Education and Research (EAER), 3003 Bern, Switzerland
| | - Alexandra Baumeyer
- Agroscope, Federal Department of Economic Affairs, Education and Research (EAER), 3003 Bern, Switzerland
| | - Mireille Tena Stern
- Agroscope, Federal Department of Economic Affairs, Education and Research (EAER), 3003 Bern, Switzerland
| | - Ueli von Ah
- Agroscope, Federal Department of Economic Affairs, Education and Research (EAER), 3003 Bern, Switzerland
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Hu Y, Zhang L, Wen R, Chen Q, Kong B. Role of lactic acid bacteria in flavor development in traditional Chinese fermented foods: A review. Crit Rev Food Sci Nutr 2020; 62:2741-2755. [PMID: 33377402 DOI: 10.1080/10408398.2020.1858269] [Citation(s) in RCA: 84] [Impact Index Per Article: 21.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
Traditional Chinese fermented foods are favored by consumers due to their unique flavor, texture and nutritional values. A large number of microorganisms participate in the process of fermentation, especially lactic acid bacteria (LAB), which are present in almost all fermented foods and contribute to flavor development. The formation process of flavor is complex and involves the biochemical conversion of various food components. It is very important to fully understand the conversion process to direct the flavor formation in foods. A comprehensive link between the LAB community and the flavor formation in traditional Chinese fermented foods is reviewed. The main mechanisms involved in the flavor formation dominated by LAB are carbohydrate metabolism, proteolysis and amino acid catabolism, and lipolysis and fatty acid metabolism. This review highlights some useful novel approaches for flavor enhancement, including the application of functional starter cultures and metabolic engineering, which may provide significant advances toward improving the flavor of fermented foods for a promising market.
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Affiliation(s)
- Yingying Hu
- College of Food Science, Northeast Agricultural University, Harbin, Heilongjiang, China
| | - Lang Zhang
- College of Food Science, Northeast Agricultural University, Harbin, Heilongjiang, China
| | - Rongxin Wen
- College of Food Science, Northeast Agricultural University, Harbin, Heilongjiang, China
| | - Qian Chen
- College of Food Science, Northeast Agricultural University, Harbin, Heilongjiang, China
| | - Baohua Kong
- College of Food Science, Northeast Agricultural University, Harbin, Heilongjiang, China
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Ding A, Zhu M, Qian X, Shi L, Huang H, Xiong G, Wang J, Wang L. Effect of fatty acids on the flavor formation of fish sauce. Lebensm Wiss Technol 2020. [DOI: 10.1016/j.lwt.2020.110259] [Citation(s) in RCA: 25] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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Chen C, Zhou W, Yu H, Yuan J, Tian H. Characterization of major odor‐active compounds responsible for nutty flavor in Cheddar cheese according to Chinese taste. FLAVOUR FRAG J 2020. [DOI: 10.1002/ffj.3627] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Chen Chen
- Department of Food Science and Technology Shanghai Institute of Technology Shanghai China
| | - Wenya Zhou
- Department of Food Science and Technology Shanghai Institute of Technology Shanghai China
| | - Haiyan Yu
- Department of Food Science and Technology Shanghai Institute of Technology Shanghai China
| | - Jiajie Yuan
- Department of Food Science and Technology Shanghai Institute of Technology Shanghai China
| | - Huaixiang Tian
- Department of Food Science and Technology Shanghai Institute of Technology Shanghai China
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