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Mai TD, Kim HM, Park SY, Ma SH, Do JH, Choi W, Jang HM, Hwang HB, Song EG, Shim JS, Joung YH. Metabolism of phenolic compounds catalyzed by Tomato CYP736A61. Enzyme Microb Technol 2024; 176:110425. [PMID: 38479200 DOI: 10.1016/j.enzmictec.2024.110425] [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: 12/06/2023] [Revised: 03/01/2024] [Accepted: 03/02/2024] [Indexed: 03/24/2024]
Abstract
Cytochrome P450s (CYPs) regulate plant growth and stress responses by producing diverse primary and secondary metabolites. However, the function of many plant CYPs remains unknown because, despite their structural similarity, predicting the enzymatic activity of CYPs is difficult. In this study, one member of the CYP736A subfamily (CYP736A61) from tomatoes was isolated and characterized its enzymatic functions. CYP736A61 was successfully expressed in Escherichia coli through co-expression with molecular chaperones. The purified CYP736A61 showed hydroxylation activity toward 7-ethoxycoumarin, producing 7-hydroxycoumarin or 3-hydroxy 7-ethoxycoumarin. Further substrate screening revealed that dihydrochalcone and stilbene derivates (resveratrol and polydatin) are the substrates of CYP736A61. CYP736A61 also mediated the hydroxylation of resveratrol and polydatin, albeit with low activity. Importantly, CYP736A61 mediated the cleavage of resveratrol and polydatin as well as pinostilbene and pterostilbene. Interestingly, CY736A61 also converted phloretin to naringenin chalcone. These results suggest that CYP736A61 is a novel CYP enzyme with stilbene cleavage activity.
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Affiliation(s)
- Thanh Dat Mai
- School of Biological Sciences and Technology, Chonnam National University, 77 Yongbong-ro, Buk-ku, Gwangju 61186, Republic of Korea
| | - Hyun Min Kim
- School of Biological Sciences and Technology, Chonnam National University, 77 Yongbong-ro, Buk-ku, Gwangju 61186, Republic of Korea
| | - Seo Young Park
- School of Biological Sciences and Technology, Chonnam National University, 77 Yongbong-ro, Buk-ku, Gwangju 61186, Republic of Korea
| | - Sang Hoon Ma
- School of Biological Sciences and Technology, Chonnam National University, 77 Yongbong-ro, Buk-ku, Gwangju 61186, Republic of Korea
| | - Ju Hui Do
- School of Biological Sciences and Technology, Chonnam National University, 77 Yongbong-ro, Buk-ku, Gwangju 61186, Republic of Korea
| | - Won Choi
- School of Biological Sciences and Technology, Chonnam National University, 77 Yongbong-ro, Buk-ku, Gwangju 61186, Republic of Korea
| | - Hye Min Jang
- School of Biological Sciences and Technology, Chonnam National University, 77 Yongbong-ro, Buk-ku, Gwangju 61186, Republic of Korea
| | - Hyeon Bae Hwang
- School of Biological Sciences and Technology, Chonnam National University, 77 Yongbong-ro, Buk-ku, Gwangju 61186, Republic of Korea
| | - Eun Gyeong Song
- School of Biological Sciences and Technology, Chonnam National University, 77 Yongbong-ro, Buk-ku, Gwangju 61186, Republic of Korea
| | - Jae Sung Shim
- School of Biological Sciences and Technology, Chonnam National University, 77 Yongbong-ro, Buk-ku, Gwangju 61186, Republic of Korea; Institute of Synthetic Biology for Carbon Neutralization, Chonnam National University, 77 Yongbong-ro, Buk-ku, Gwangju 61186, Republic of Korea.
| | - Young Hee Joung
- School of Biological Sciences and Technology, Chonnam National University, 77 Yongbong-ro, Buk-ku, Gwangju 61186, Republic of Korea.
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Zhang QW, Kong CL, Tao YS. Fate of carotenoids in yeasts: synthesis and cleavage. Crit Rev Food Sci Nutr 2022; 63:7638-7652. [PMID: 35275506 DOI: 10.1080/10408398.2022.2048352] [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] [Indexed: 11/03/2022]
Abstract
Carotenoids and their cleavage products (norisoprenoids) have excellent functional properties with diverse applications in foods, medicaments, cosmetics, etc. Carotenoids can be oxidatively cleaved through nonspecific reactions or by carotenoid cleavage oxygenases (CCOs), the product of which could further modify food flavor. This review provides comprehensive information on both carotenoid synthesis and cleavage processes with emphasis on enzyme characterization and biosynthetic pathway optimization. The use of interdisciplinary approaches of bioengineering and computer-aided experimental technology for key enzyme modification and systematic pathway design is beneficial to monitor metabolic pathways and assess pathway bottlenecks, which could efficiently lead to accumulation of carotenoids in microorganisms. The identification of CCOs spatial structures isolated from different species has made a significant contribution to the current state of knowledge. Current trends in carotenoid-related flavor modification are also discussed. In particular, we propose the carotenoid-synthesizing yeast Rhodotorula spp. for the production of food bioactive compounds. Understanding the behavior underlying the formation of norisoprenoids from carotenoids using interdisciplinary approaches may point toward other areas of investigation that could lead to better exploiting the potential use of autochthonous yeast in flavor enhancement.
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Affiliation(s)
- Qian-Wei Zhang
- College of Enology, Northwest A&F University, Yangling, Shaanxi, China
| | - Cai-Lin Kong
- College of Enology, Northwest A&F University, Yangling, Shaanxi, China
| | - Yong-Sheng Tao
- College of Enology, Northwest A&F University, Yangling, Shaanxi, China
- Ningxia Helan Mountain's East Foothill Wine Experiment and Demonstration Station of Northwest A&F University, Yongning, Ningxia, China
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Jeandet P, Vannozzi A, Sobarzo-Sánchez E, Uddin MS, Bru R, Martínez-Márquez A, Clément C, Cordelier S, Manayi A, Nabavi SF, Rasekhian M, El-Saber Batiha G, Khan H, Morkunas I, Belwal T, Jiang J, Koffas M, Nabavi SM. Phytostilbenes as agrochemicals: biosynthesis, bioactivity, metabolic engineering and biotechnology. Nat Prod Rep 2021; 38:1282-1329. [PMID: 33351014 DOI: 10.1039/d0np00030b] [Citation(s) in RCA: 40] [Impact Index Per Article: 13.3] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
Covering: 1976 to 2020. Although constituting a limited chemical family, phytostilbenes represent an emblematic group of molecules among natural compounds. Ever since their discovery as antifungal compounds in plants and their ascribed role in human health and disease, phytostilbenes have never ceased to arouse interest for researchers, leading to a huge development of the literature in this field. Owing to this, the number of references to this class of compounds has reached the tens of thousands. The objective of this article is thus to offer an overview of the different aspects of these compounds through a large bibliography analysis of more than 500 articles. All the aspects regarding phytostilbenes will be covered including their chemistry and biochemistry, regulation of their biosynthesis, biological activities in plants, molecular engineering of stilbene pathways in plants and microbes as well as their biotechnological production by plant cell systems.
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Affiliation(s)
- Philippe Jeandet
- Research Unit "Induced Resistance and Plant Bioprotection", EA 4707, SFR Condorcet FR CNRS 3417, Faculty of Sciences, University of Reims Champagne-Ardenne, PO Box 1039, 51687 Reims Cedex 2, France.
| | - Alessandro Vannozzi
- Department of Agronomy, Food, Natural Resources, Animals, and Environment (DAFNAE), University of Padova, 35020 Legnaro, PD, Italy
| | - Eduardo Sobarzo-Sánchez
- Laboratory of Pharmaceutical Chemistry, Faculty of Pharmacy, University of Santiago de Compostela, Campus Vida, 15782 Santiago de Compostela, Spain and Instituto de Investigación e Innovación en Salud, Facultad de Ciencias de la Salud, Universidad Central de Chile, Chile
| | - Md Sahab Uddin
- Department of Pharmacy, Southeast University, Dhaka, Bangladesh and Neuroscience Research Network, Dhaka, Bangladesh
| | - Roque Bru
- Plant Proteomics and Functional Genomics Group, Department of Agrochemistry and Biochemistry, Faculty of Science, University of Alicante, Alicante, Spain
| | - Ascension Martínez-Márquez
- Plant Proteomics and Functional Genomics Group, Department of Agrochemistry and Biochemistry, Faculty of Science, University of Alicante, Alicante, Spain
| | - Christophe Clément
- Research Unit "Induced Resistance and Plant Bioprotection", EA 4707, SFR Condorcet FR CNRS 3417, Faculty of Sciences, University of Reims Champagne-Ardenne, PO Box 1039, 51687 Reims Cedex 2, France.
| | - Sylvain Cordelier
- Research Unit "Induced Resistance and Plant Bioprotection", EA 4707, SFR Condorcet FR CNRS 3417, Faculty of Sciences, University of Reims Champagne-Ardenne, PO Box 1039, 51687 Reims Cedex 2, France.
| | - Azadeh Manayi
- Medicinal Plants Research Center, Faculty of Pharmacy, Tehran University of Medical Sciences, 1417614411 Tehran, Iran
| | - Seyed Fazel Nabavi
- Applied Biotechnology Research Center, Baqiyatallah University of Medical Sciences, Tehran 14359-16471, Iran
| | - Mahsa Rasekhian
- Pharmaceutical Sciences Research Center, Health Institute, Kermanshah University of Medical Sciences, Kermanshah, Iran
| | - Gaber El-Saber Batiha
- Department of Pharmacology and Toxicology, Faculty of Veterinary Medicine, Damanhour University, Damanhour, 22511, AlBeheira, Egypt
| | - Haroon Khan
- Department of Pharmacy, Faculty of Chemical and Life Sciences, Abdul Wali Khan University Mardan, 23200, Pakistan
| | - Iwona Morkunas
- Department of Plant Physiology, Poznań University of Life Sciences, Wołyńska 35, 60-637 Poznań, Poland
| | - Tarun Belwal
- Zhejiang University, College of Biosystems Engineering and Food Science, Key Laboratory of Agro-Products Postharvest Handling of Ministry of Agriculture and Rural Affairs, Zhejiang Key Laboratory for Agri-Food Processing, Hangzhou 310058, The People's Republic of China
| | - Jingjie Jiang
- Dorothy and Fred Chau '71 Constellation Professor, Center for Biotechnology and Interdisciplinary Studies, Rensselaer Polytechnic Institute, Room 4005D, 110 8th Street, Troy, NY 12180, USA
| | - Mattheos Koffas
- Dorothy and Fred Chau '71 Constellation Professor, Center for Biotechnology and Interdisciplinary Studies, Rensselaer Polytechnic Institute, Room 4005D, 110 8th Street, Troy, NY 12180, USA
| | - Seyed Mohammad Nabavi
- Applied Biotechnology Research Center, Baqiyatallah University of Medical Sciences, Tehran 14359-16471, Iran
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Daruwalla A, Kiser PD. Structural and mechanistic aspects of carotenoid cleavage dioxygenases (CCDs). Biochim Biophys Acta Mol Cell Biol Lipids 2019; 1865:158590. [PMID: 31874225 DOI: 10.1016/j.bbalip.2019.158590] [Citation(s) in RCA: 26] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/31/2019] [Revised: 12/10/2019] [Accepted: 12/11/2019] [Indexed: 02/03/2023]
Abstract
Carotenoid cleavage dioxygenases (CCDs) comprise a superfamily of mononuclear non-heme iron proteins that catalyze the oxygenolytic fission of alkene bonds in carotenoids to generate apocarotenoid products. Some of these enzymes exhibit additional activities such as carbon skeleton rearrangement and trans-cis isomerization. The group also includes a subfamily of enzymes that split the interphenyl alkene bond in molecules such as resveratrol and lignostilbene. CCDs are involved in numerous biological processes ranging from production of light-sensing chromophores to degradation of lignin derivatives in pulping waste sludge. These enzymes exhibit unique features that distinguish them from other families of non-heme iron enzymes. The distinctive properties and biological importance of CCDs have stimulated interest in their modes of catalysis. Recent structural, spectroscopic, and computational studies have helped clarify mechanistic aspects of CCD catalysis. Here, we review these findings emphasizing common and unique properties of CCDs that enable their variable substrate specificity and regioselectivity. This article is part of a Special Issue entitled Carotenoids recent advances in cell and molecular biology edited by Johannes von Lintig and Loredana Quadro.
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Affiliation(s)
- Anahita Daruwalla
- Department of Pharmacology, Case Western Reserve University, Cleveland, OH 44106, United States of America; Department of Physiology & Biophysics, University of California, Irvine, CA 92697, United States of America
| | - Philip D Kiser
- Department of Physiology & Biophysics, University of California, Irvine, CA 92697, United States of America; Research Service, VA Long Beach Healthcare System, Long Beach, CA 90822, United States of America.
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Wang HW, Sun K, Guan YX, Qiu MH, Zhang L, Dai CC. Fungal endophyte Phomopsis liquidambari biodegrades soil resveratrol: a potential allelochemical in peanut monocropping systems. JOURNAL OF THE SCIENCE OF FOOD AND AGRICULTURE 2019; 99:5899-5909. [PMID: 31225657 DOI: 10.1002/jsfa.9865] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/14/2018] [Revised: 05/23/2019] [Accepted: 06/11/2019] [Indexed: 05/13/2023]
Abstract
BACKGROUND Most allelochemicals are secondary products released from root excretions or plant residues that accumulate in continuous cropping systems and cause severe decline in peanut yield. Resveratrol is a plant-derived stilbene that is released from peanut residues and accumulates in the soil; however, its allelopathic effects on peanut production are overlooked. Effective management solutions need to be developed to relieve allelopathy caused by soil resveratrol. Here, the biodegradation of resveratrol by the fungal endophyte Phomopsis liquidambari was investigated in a mineral salt medium and a soil trial. Resveratrol and its metabolites (produced by degradation by P. liquidambari) were detected by high-performance liquid chromatography-mass spectrometry (HPLC-MS). RESULTS Resveratrol released from peanut residues reached a maximum concentration of 0.18 μg g-1 soil in litterbag experiments. Exogenous resveratrol inhibited peanut growth, nodule formation, and soil dehydrogenase activity, and reduced the soil microbial biomass carbon content and bacterial abundance, indicating an allelopathic role in peanut growth. More than 97% of the resveratrol was degraded within 72 and 168 h by P. liquidambari in pure culture and soil conditions, respectively. Resveratrol was first cleaved to 3,5-dihydroxybenzaldehyde and 4-hydroxybenzaldehyde, which were subsequently oxidized into 3,5-dihydroxybenzoic acid and 4-hydroxybenzoic acid, respectively. Fungal resveratrol cleavage oxygenase and the related gene expression were enhanced when P. liquidambari was induced by the resveratrol during the incubation. CONCLUSION Our results indicate that the practical application of the fungal endophyte P. liquidambari has strong potential for biodegrading soil resveratrol, which can cause allelopathy in peanut continuous cropping systems. © 2019 Society of Chemical Industry.
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Affiliation(s)
- Hong-Wei Wang
- Jiangsu Key Laboratory for Microbes and Functional Genomics, Jiangsu Engineering and Technology Research Center for Industrialization of Microbial Resources, College of Life Sciences, Nanjing Normal University, Nanjing, China
| | - Kai Sun
- Jiangsu Key Laboratory for Microbes and Functional Genomics, Jiangsu Engineering and Technology Research Center for Industrialization of Microbial Resources, College of Life Sciences, Nanjing Normal University, Nanjing, China
| | - Yong-Xiang Guan
- Soil Quality Protection and Environmental Monitoring Station of Jiangsu Province, Nanjing, China
| | - Mei-Hua Qiu
- Soil Quality Protection and Environmental Monitoring Station of Jiangsu Province, Nanjing, China
| | - Li Zhang
- Soil Quality Protection and Environmental Monitoring Station of Jiangsu Province, Nanjing, China
| | - Chuan-Chao Dai
- Jiangsu Key Laboratory for Microbes and Functional Genomics, Jiangsu Engineering and Technology Research Center for Industrialization of Microbial Resources, College of Life Sciences, Nanjing Normal University, Nanjing, China
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6
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Kuatsjah E, Verstraete MM, Kobylarz MJ, Liu AKN, Murphy MEP, Eltis LD. Identification of functionally important residues and structural features in a bacterial lignostilbene dioxygenase. J Biol Chem 2019; 294:12911-12920. [PMID: 31292192 DOI: 10.1074/jbc.ra119.009428] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/27/2019] [Revised: 07/03/2019] [Indexed: 01/21/2023] Open
Abstract
Lignostilbene-α,β-dioxygenase A (LsdA) from the bacterium Sphingomonas paucimobilis TMY1009 is a nonheme iron oxygenase that catalyzes the cleavage of lignostilbene, a compound arising in lignin transformation, to two vanillin molecules. To examine LsdA's substrate specificity, we heterologously produced the dimeric enzyme with the help of chaperones. When tested on several substituted stilbenes, LsdA exhibited the greatest specificity for lignostilbene (k cat app = 1.00 ± 0.04 × 106 m-1 s-1). These experiments further indicated that the substrate's 4-hydroxy moiety is required for catalysis and that this moiety cannot be replaced with a methoxy group. Phenylazophenol inhibited the LsdA-catalyzed cleavage of lignostilbene in a reversible, mixed fashion (Kic = 6 ± 1 μm, Kiu = 24 ± 4 μm). An X-ray crystal structure of LsdA at 2.3 Å resolution revealed a seven-bladed β-propeller fold with an iron cofactor coordinated by four histidines, in agreement with previous observations on related carotenoid cleavage oxygenases. We noted that residues at the dimer interface are also present in LsdB, another lignostilbene dioxygenase in S. paucimobilis TMY1009, rationalizing LsdA and LsdB homo- and heterodimerization in vivo A structure of an LsdA·phenylazophenol complex identified Phe59, Tyr101, and Lys134 as contacting the 4-hydroxyphenyl moiety of the inhibitor. Phe59 and Tyr101 substitutions with His and Phe, respectively, reduced LsdA activity (k cat app) ∼15- and 10-fold. The K134M variant did not detectably cleave lignostilbene, indicating that Lys134 plays a key catalytic role. This study expands our mechanistic understanding of LsdA and related stilbene-cleaving dioxygenases.
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Affiliation(s)
- Eugene Kuatsjah
- Genome Science and Technology Program, The University of British Columbia, Vancouver V6T 1Z3, Canada
| | - Meghan M Verstraete
- Department of Microbiology and Immunology, The University of British Columbia, Vancouver V6T 1Z3, Canada
| | - Marek J Kobylarz
- Department of Microbiology and Immunology, The University of British Columbia, Vancouver V6T 1Z3, Canada
| | - Alvin K N Liu
- Department of Microbiology and Immunology, The University of British Columbia, Vancouver V6T 1Z3, Canada
| | - Michael E P Murphy
- Department of Microbiology and Immunology, The University of British Columbia, Vancouver V6T 1Z3, Canada
| | - Lindsay D Eltis
- Genome Science and Technology Program, The University of British Columbia, Vancouver V6T 1Z3, Canada; Department of Microbiology and Immunology, The University of British Columbia, Vancouver V6T 1Z3, Canada.
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Lu J, Lai W. Mechanistic Insights into a Stibene Cleavage Oxygenase NOV1 from Quantum Mechanical/Molecular Mechanical Calculations. ChemistryOpen 2019; 8:228-235. [PMID: 30828510 PMCID: PMC6382310 DOI: 10.1002/open.201800259] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/20/2018] [Revised: 01/30/2019] [Indexed: 12/03/2022] Open
Abstract
NOV1, a stilbene cleavage oxygenase, catalyzes the cleavage of the central double bond of stilbenes to two phenolic aldehydes, using a 4-His Fe(II) center and dioxygen. Herein, we use in-protein quantum mechanical/molecular mechanical (QM/MM) calculations to elucidate the reaction mechanism of the central double bond cleavage of phytoalexin resveratrol by NOV1. Our results showed that the oxygen molecule prefers to bind to the iron center in a side-on fashion, as suggested from the experiment. The quintet Fe-O2 complex with the side-on superoxo antiferromagnetic coupled to the resveratrol radical is identified as the reactive oxygen species. The QM/MM results support the dioxygenase mechanism involving a dioxetane intermediate with a rate-limiting barrier of 10.0 kcal mol-1. The alternative pathway through an epoxide intermediate is ruled out due to a larger rate-limiting barrier (26.8 kcal mol-1). These findings provide important insight into the catalytic mechanism of carotenoid cleavage oxygenases and also the dioxygen activation of non-heme enzymes.
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Affiliation(s)
- Jiarui Lu
- Department of ChemistryRenmin University of ChinaNo. 59 Zhongguancun Street, Haidian DistrictBeijing100872P. R. China
| | - Wenzhen Lai
- Department of ChemistryRenmin University of ChinaNo. 59 Zhongguancun Street, Haidian DistrictBeijing100872P. R. China
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Bai J, Hou Q, Zhu W, Liu Y. Mechanical insights into the oxidative cleavage of resveratrol catalyzed by dioxygenase NOV1 from Novosphingobium aromaticivorans: confirmation of dioxygenase mechanism by QM/MM calculations. Catal Sci Technol 2019. [DOI: 10.1039/c8cy01885e] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
QM/MM calculations confirm that the oxidative cleavage of resveratrol catalyzed by dioxygenase NOV1 follows the dioxygenase mechanism.
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Affiliation(s)
- Jie Bai
- Key Lab of Colloid and Interface Chemistry, Ministry of Education
- School of Chemistry and Chemical Engineering
- Shandong University
- Jinan
- China
| | - Qianqian Hou
- Shandong Non-metallic Materials Institute
- Jinan
- China
| | - Wenyou Zhu
- College of Chemistry and Chemical Engineering
- Xuzhou Institute of Technology
- Xuzhou
- China
| | - Yongjun Liu
- Key Lab of Colloid and Interface Chemistry, Ministry of Education
- School of Chemistry and Chemical Engineering
- Shandong University
- Jinan
- China
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Gluck‐Thaler E, Vijayakumar V, Slot JC. Fungal adaptation to plant defences through convergent assembly of metabolic modules. Mol Ecol 2018; 27:5120-5136. [DOI: 10.1111/mec.14943] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/10/2018] [Revised: 10/14/2018] [Accepted: 10/15/2018] [Indexed: 01/08/2023]
Affiliation(s)
- Emile Gluck‐Thaler
- Department of Plant Pathology, College of Food, Agricultural, and Environmental Sciences The Ohio State University Columbus Ohio
| | - Vinod Vijayakumar
- Department of Plant Pathology, College of Food, Agricultural, and Environmental Sciences The Ohio State University Columbus Ohio
| | - Jason C. Slot
- Department of Plant Pathology, College of Food, Agricultural, and Environmental Sciences The Ohio State University Columbus Ohio
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10
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Sui X, Farquhar ER, Hill HE, von Lintig J, Shi W, Kiser PD. Preparation and characterization of metal-substituted carotenoid cleavage oxygenases. J Biol Inorg Chem 2018; 23:887-901. [PMID: 29946976 PMCID: PMC6060882 DOI: 10.1007/s00775-018-1586-0] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/07/2018] [Accepted: 06/20/2018] [Indexed: 11/26/2022]
Abstract
Carotenoid cleavage oxygenases (CCO) are non-heme iron enzymes that catalyze oxidative cleavage of alkene bonds in carotenoid and stilbenoid substrates. Previously, we showed that the iron cofactor of CAO1, a resveratrol-cleaving member of this family, can be substituted with cobalt to yield a catalytically inert enzyme useful for trapping active site-bound stilbenoid substrates for structural characterization. Metal substitution may provide a general method for identifying the natural substrates for CCOs in addition to facilitating structural and biophysical characterization of CCO-carotenoid complexes under normal aerobic conditions. Here, we demonstrate the general applicability of cobalt substitution in a prototypical carotenoid cleaving CCO, apocarotenoid oxygenase (ACO) from Synechocystis. Among the non-native divalent metals investigated, cobalt was uniquely able to stably occupy the ACO metal binding site and inhibit catalysis. Analysis by X-ray crystallography and X-ray absorption spectroscopy demonstrate that the Co(II) forms of both ACO and CAO1 exhibit a close structural correspondence to the native Fe(II) enzyme forms. Hence, cobalt substitution is an effective strategy for generating catalytically inert but structurally intact forms of CCOs.
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Affiliation(s)
- Xuewu Sui
- Department of Pharmacology, School of Medicine, Case Western Reserve University, 10900 Euclid Ave., Cleveland, OH, 44106, USA
- Department of Genetics and Complex Diseases, Harvard T.H. Chan School of Public Health, Boston, MA, 02115, USA
| | - Erik R Farquhar
- National Synchrotron Light Source-II, Brookhaven National Laboratory, Upton, NY, 11973, USA
- Center for Proteomics and Bioinformatics, Center for Synchrotron Biosciences, School of Medicine, Case Western Reserve University, 10900 Euclid Ave., Cleveland, OH, 44106-4988, USA
| | - Hannah E Hill
- Department of Pharmacology, School of Medicine, Case Western Reserve University, 10900 Euclid Ave., Cleveland, OH, 44106, USA
| | - Johannes von Lintig
- Department of Pharmacology, School of Medicine, Case Western Reserve University, 10900 Euclid Ave., Cleveland, OH, 44106, USA
| | - Wuxian Shi
- National Synchrotron Light Source-II, Brookhaven National Laboratory, Upton, NY, 11973, USA
- Center for Proteomics and Bioinformatics, Center for Synchrotron Biosciences, School of Medicine, Case Western Reserve University, 10900 Euclid Ave., Cleveland, OH, 44106-4988, USA
| | - Philip D Kiser
- Department of Pharmacology, School of Medicine, Case Western Reserve University, 10900 Euclid Ave., Cleveland, OH, 44106, USA.
- Cleveland Center for Membrane and Structural Biology, Case Western Reserve University, 1819 E 101st Street, Cleveland, OH, 44106, USA.
- Research Service, Louis Stokes Cleveland VA Medical Center, 10701 East Boulevard, Cleveland, OH, 44106, USA.
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Abstract
Resveratrol is among the best-known secondary plant metabolites because of its antioxidant, anti-inflammatory, and anticancer properties. It also is an important allelopathic chemical widely credited with the protection of plants from pathogens. The ecological role of resveratrol in natural habitats is difficult to establish rigorously, because it does not seem to accumulate outside plant tissue. It is likely that bacterial degradation plays a key role in determining the persistence, and thus the ecological role, of resveratrol in soil. Here, we report the isolation of an Acinetobacter species that can use resveratrol as a sole carbon source from the rhizosphere of peanut plants. Both molecular and biochemical techniques indicate that the pathway starts with the conversion of resveratrol to 3,5-dihydroxybenzaldehyde and 4-hydroxybenzaldehyde. The aldehydes are oxidized to substituted benzoates that subsequently enter central metabolism. The gene that encodes the enzyme responsible for the oxidative cleavage of resveratrol was cloned and expressed in Escherichia coli to establish its function. Its physiological role in the resveratrol catabolic pathway was established by knockouts and by the reverse transcription-quantitative PCR (RT-qPCR) demonstration of expression during growth on resveratrol. The results establish the presence and capabilities of resveratrol-degrading bacteria in the rhizosphere of the peanut plants and set the stage for studies to evaluate the role of the bacteria in plant allelopathy.IMPORTANCE In addition to its antioxidant properties, resveratrol is representative of a broad array of allelopathic chemicals produced by plants to inhibit competitors, herbivores, and pathogens. The bacterial degradation of such chemicals in the rhizosphere would reduce the effects of the chemicals. Therefore, it is important to understand the activity and ecological role of bacteria that biodegrade resveratrol near the plants that produce it. This study describes the isolation from the peanut rhizosphere of bacteria that can grow on resveratrol. The characterization of the initial steps in the biodegradation process sets the stage for the investigation of the evolution of the catabolic pathways responsible for the biodegradation of resveratrol and its homologs.
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12
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Phylogenetic analysis of the metazoan carotenoid oxygenase superfamily: a new ancestral gene assemblage of BCO-like (BCOL) proteins. Sci Rep 2017; 7:13192. [PMID: 29038443 PMCID: PMC5643517 DOI: 10.1038/s41598-017-13521-x] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/14/2017] [Accepted: 09/25/2017] [Indexed: 11/08/2022] Open
Abstract
Here we describe a new family of carotenoid cleavage oxygenases (CCOs) in metazoans, the BCO2-like (BCOL) clade, which contains lancelet, nematode, and molluscan carotenoid oxygenase sequences. Phylogenetic analysis of CCOs in all kingdoms of life confirmed that the BCOL enzymes are an independent clade of ancient origin. One of the predicted lancelet BCOL proteins, cloned and analyzed for carotenoid cleavage activity in a bacterial carotenoid expression system, had activity similar to lancelet BCO2 proteins, although with a preference for cis isomers. Our docking predictions correlated well with the cis-favored activity. The extensive expansions of the new animal BCOL family in some species (e.g., lancelet) suggests that the carotenoid cleavage oxygenase superfamily has evolved in the “extremely high turnover” fashion: numerous losses and duplications of this family are likely to reflect complex regulation processes during development, and interactions with the environment. These findings also serve to provide a rationale for the evolution of the BCO-related outlier RPE65 retinol isomerase, an enzyme that does not utilize carotenoids as substrate or perform double-bond cleavage.
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Sui X, Weitz AC, Farquhar ER, Badiee M, Banerjee S, von Lintig J, Tochtrop GP, Palczewski K, Hendrich MP, Kiser PD. Structure and Spectroscopy of Alkene-Cleaving Dioxygenases Containing an Atypically Coordinated Non-Heme Iron Center. Biochemistry 2017; 56:2836-2852. [PMID: 28493664 DOI: 10.1021/acs.biochem.7b00251] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Carotenoid cleavage oxygenases (CCOs) are non-heme iron enzymes that catalyze scission of alkene groups in carotenoids and stilbenoids to form biologically important products. CCOs possess a rare four-His iron center whose resting-state structure and interaction with substrates are incompletely understood. Here, we address this knowledge gap through a comprehensive structural and spectroscopic study of three phyletically diverse CCOs. The crystal structure of a fungal stilbenoid-cleaving CCO, CAO1, reveals strong similarity between its iron center and those of carotenoid-cleaving CCOs, but with a markedly different substrate-binding cleft. These enzymes all possess a five-coordinate high-spin Fe(II) center with resting-state Fe-His bond lengths of ∼2.15 Å. This ligand set generates an iron environment more electropositive than those of other non-heme iron dioxygenases as observed by Mössbauer isomer shifts. Dioxygen (O2) does not coordinate iron in the absence of substrate. Substrates bind away (∼4.7 Å) from the iron and have little impact on its electronic structure, thus excluding coordination-triggered O2 binding. However, substrate binding does perturb the spectral properties of CCO Fe-NO derivatives, indicating proximate organic substrate and O2-binding sites, which might influence Fe-O2 interactions. Together, these data provide a robust description of the CCO iron center and its interactions with substrates and substrate mimetics that illuminates commonalities as well as subtle and profound structural differences within the CCO family.
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Affiliation(s)
- Xuewu Sui
- Department of Pharmacology, School of Medicine, Case Western Reserve University , 10900 Euclid Avenue, Cleveland, Ohio 44106, United States
| | - Andrew C Weitz
- Department of Chemistry, Carnegie Mellon University , 4400 Fifth Avenue, Pittsburgh, Pennsylvania 15213, United States
| | - Erik R Farquhar
- National Synchrotron Light Source-II, Brookhaven National Laboratory , Upton, New York 11973, United States.,Center for Proteomics and Bioinformatics, Center for Synchrotron Biosciences, School of Medicine, Case Western Reserve University , 10900 Euclid Avenue, Cleveland, Ohio 44106-4988, United States
| | - Mohsen Badiee
- Department of Chemistry, Case Western Reserve University , 2080 Adelbert Road, Cleveland, Ohio 44106, United States
| | - Surajit Banerjee
- Department of Chemistry and Chemical Biology, Cornell University , Ithaca, New York 14850, United States.,Northeastern Collaborative Access Team, Argonne National Laboratory , Argonne, Illinois 60439, United States
| | - Johannes von Lintig
- Department of Pharmacology, School of Medicine, Case Western Reserve University , 10900 Euclid Avenue, Cleveland, Ohio 44106, United States
| | - Gregory P Tochtrop
- Department of Chemistry, Case Western Reserve University , 2080 Adelbert Road, Cleveland, Ohio 44106, United States
| | - Krzysztof Palczewski
- Department of Pharmacology, School of Medicine, Case Western Reserve University , 10900 Euclid Avenue, Cleveland, Ohio 44106, United States.,Cleveland Center for Membrane and Structural Biology, Case Western Reserve University , 1819 East 101st Street, Cleveland, Ohio 44106, United States
| | - Michael P Hendrich
- Department of Chemistry, Carnegie Mellon University , 4400 Fifth Avenue, Pittsburgh, Pennsylvania 15213, United States
| | - Philip D Kiser
- Department of Pharmacology, School of Medicine, Case Western Reserve University , 10900 Euclid Avenue, Cleveland, Ohio 44106, United States.,Research Service, Louis Stokes Cleveland VA Medical Center , 10701 East Boulevard, Cleveland, Ohio 44106, United States
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McAndrew RP, Sathitsuksanoh N, Mbughuni MM, Heins RA, Pereira JH, George A, Sale KL, Fox BG, Simmons BA, Adams PD. Structure and mechanism of NOV1, a resveratrol-cleaving dioxygenase. Proc Natl Acad Sci U S A 2016; 113:14324-14329. [PMID: 27911781 PMCID: PMC5167157 DOI: 10.1073/pnas.1608917113] [Citation(s) in RCA: 46] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
Stilbenes are diphenyl ethene compounds produced naturally in a wide variety of plant species and some bacteria. Stilbenes are also derived from lignin during kraft pulping. Stilbene cleavage oxygenases (SCOs) cleave the central double bond of stilbenes, forming two phenolic aldehydes. Here, we report the structure of an SCO. The X-ray structure of NOV1 from Novosphingobium aromaticivorans was determined in complex with its substrate resveratrol (1.89 Å), its product vanillin (1.75 Å), and without any bound ligand (1.61 Å). The enzyme is a seven-bladed β-propeller with an iron cofactor coordinated by four histidines. In all three structures, dioxygen is observed bound to the iron in a side-on fashion. These structures, along with EPR analysis, allow us to propose a mechanism in which a ferric-superoxide reacts with substrate activated by deprotonation of a phenol group at position 4 of the substrate, which allows movement of electron density toward the central double bond and thus facilitates reaction with the ferric superoxide electrophile. Correspondingly, NOV1 cleaves a wide range of other stilbene-like compounds with a 4'-OH group, offering potential in processing some solubilized fragments of lignin into monomer aromatic compounds.
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Affiliation(s)
- Ryan P McAndrew
- Joint BioEnergy Institute, Emeryville, CA 94608;
- Molecular Biophysics & Integrated Bioimaging Division, Lawrence Berkeley National Laboratory, Berkeley, CA 94720
| | - Noppadon Sathitsuksanoh
- Joint BioEnergy Institute, Emeryville, CA 94608
- Molecular Biophysics & Integrated Bioimaging Division, Lawrence Berkeley National Laboratory, Berkeley, CA 94720
- Department of Chemical Engineering, University of Louisville, Louisville, KY 40292
- Conn Center for Renewable Energy Research, University of Louisville, Louisville, KY 40292
| | - Michael M Mbughuni
- Department of Biochemistry, College of Agricultural and Life Sciences, University of Wisconsin, Madison, WI 53706
- Great Lakes Bioenergy Research Center, University of Wisconsin, Madison, WI 53706
| | - Richard A Heins
- Joint BioEnergy Institute, Emeryville, CA 94608
- Biological and Engineering Sciences Center, Sandia National Laboratories, Livermore, CA 94551
| | - Jose H Pereira
- Joint BioEnergy Institute, Emeryville, CA 94608
- Molecular Biophysics & Integrated Bioimaging Division, Lawrence Berkeley National Laboratory, Berkeley, CA 94720
| | - Anthe George
- Joint BioEnergy Institute, Emeryville, CA 94608
- Biological and Engineering Sciences Center, Sandia National Laboratories, Livermore, CA 94551
| | - Kenneth L Sale
- Joint BioEnergy Institute, Emeryville, CA 94608
- Biological and Engineering Sciences Center, Sandia National Laboratories, Livermore, CA 94551
| | - Brian G Fox
- Department of Biochemistry, College of Agricultural and Life Sciences, University of Wisconsin, Madison, WI 53706
- Great Lakes Bioenergy Research Center, University of Wisconsin, Madison, WI 53706
| | - Blake A Simmons
- Joint BioEnergy Institute, Emeryville, CA 94608
- Biological Systems & Engineering Division, Lawrence Berkeley National Laboratory, Berkeley, CA 94720
| | - Paul D Adams
- Joint BioEnergy Institute, Emeryville, CA 94608;
- Molecular Biophysics & Integrated Bioimaging Division, Lawrence Berkeley National Laboratory, Berkeley, CA 94720
- Department of Bioengineering, University of California, Berkeley, CA 94720
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Ahrazem O, Gómez-Gómez L, Rodrigo MJ, Avalos J, Limón MC. Carotenoid Cleavage Oxygenases from Microbes and Photosynthetic Organisms: Features and Functions. Int J Mol Sci 2016; 17:E1781. [PMID: 27792173 PMCID: PMC5133782 DOI: 10.3390/ijms17111781] [Citation(s) in RCA: 92] [Impact Index Per Article: 11.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/05/2016] [Revised: 10/07/2016] [Accepted: 10/08/2016] [Indexed: 11/17/2022] Open
Abstract
Apocarotenoids are carotenoid-derived compounds widespread in all major taxonomic groups, where they play important roles in different physiological processes. In addition, apocarotenoids include compounds with high economic value in food and cosmetics industries. Apocarotenoid biosynthesis starts with the action of carotenoid cleavage dioxygenases (CCDs), a family of non-heme iron enzymes that catalyze the oxidative cleavage of carbon-carbon double bonds in carotenoid backbones through a similar molecular mechanism, generating aldehyde or ketone groups in the cleaving ends. From the identification of the first CCD enzyme in plants, an increasing number of CCDs have been identified in many other species, including microorganisms, proving to be a ubiquitously distributed and evolutionarily conserved enzymatic family. This review focuses on CCDs from plants, algae, fungi, and bacteria, describing recent progress in their functions and regulatory mechanisms in relation to the different roles played by the apocarotenoids in these organisms.
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Affiliation(s)
- Oussama Ahrazem
- Instituto Botánico, Departamento de Ciencia y Tecnología Agroforestal y Genética, Facultad de Farmacia, Universidad de Castilla-La Mancha, Campus Universitario s/n, 02071 Albacete, Spain.
| | - Lourdes Gómez-Gómez
- Instituto Botánico, Departamento de Ciencia y Tecnología Agroforestal y Genética, Facultad de Farmacia, Universidad de Castilla-La Mancha, Campus Universitario s/n, 02071 Albacete, Spain.
| | - María J Rodrigo
- Instituto de Agroquímica y Tecnología de Alimentos (IATA-CSIC), Departamento de Ciencia de los Alimentos, Calle Catedrático Agustín Escardino 7, 46980 Paterna, Spain.
| | - Javier Avalos
- Departamento de Genética, Facultad de Biología, Universidad de Sevilla, Avenida Reina Mercedes 6, 41012 Sevilla, Spain.
| | - María Carmen Limón
- Departamento de Genética, Facultad de Biología, Universidad de Sevilla, Avenida Reina Mercedes 6, 41012 Sevilla, Spain.
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Díaz-Sánchez V, Limón MC, Schaub P, Al-Babili S, Avalos J. A RALDH-like enzyme involved in Fusarium verticillioides development. Fungal Genet Biol 2015; 86:20-32. [PMID: 26688466 DOI: 10.1016/j.fgb.2015.12.005] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/23/2014] [Revised: 12/04/2015] [Accepted: 12/09/2015] [Indexed: 01/30/2023]
Abstract
Retinaldehyde dehydrogenases (RALDHs) convert retinal to retinoic acid, an important chordate morphogen. Retinal also occurs in some fungi, such as Fusarium and Ustilago spp., evidenced by the presence of rhodopsins and β-carotene cleaving, retinal-forming dioxygenases. Based on the assumption that retinoic acid may also be formed in fungi, we searched the Fusarium protein databases for RALDHs homologs, focusing on Fusarium verticillioides. Using crude lysates of Escherichia coli cells expressing the corresponding cDNAs, we checked the capability of best matches to convert retinal into retinoic acid in vitro. Thereby, we identified an aldehyde dehydrogenase, termed CarY, as a retinoic acid-forming enzyme, an activity that was also exerted by purified CarY. Targeted mutation of the carY gene in F. verticillioides resulted in alterations of mycelia development and conidia morphology in agar cultures, and reduced capacity to produce perithecia as a female in sexual crosses. Complementation of the mutant with a wild-type carY allele demonstrated that these alterations are caused by the lackof CarY. However, retinoic acid could not be detected by LC-MS analysis either in the wild type or the complemented carY strain in vivo, making elusive the connection between CarY enzymatic activity and retinoic acid formation in the fungus.
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Affiliation(s)
- Violeta Díaz-Sánchez
- Department of Genetics, Faculty of Biology, University of Seville, E-41012 Seville, Spain
| | - M Carmen Limón
- Department of Genetics, Faculty of Biology, University of Seville, E-41012 Seville, Spain
| | - Patrick Schaub
- Faculty of Biology, Albert-Ludwigs University of Freiburg, Schaenzlestr. 1, D-79104 Freiburg, Germany
| | - Salim Al-Babili
- Center for Desert Agriculture, BESE Division, King Abdullah University of Science and Technology (KAUST), 23955-6900 Thuwal, Saudi Arabia
| | - Javier Avalos
- Department of Genetics, Faculty of Biology, University of Seville, E-41012 Seville, Spain.
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17
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Xie LX, Williams KJ, He CH, Weng E, Khong S, Rose TE, Kwon O, Bensinger SJ, Marbois BN, Clarke CF. Resveratrol and para-coumarate serve as ring precursors for coenzyme Q biosynthesis. J Lipid Res 2015; 56:909-19. [PMID: 25681964 DOI: 10.1194/jlr.m057919] [Citation(s) in RCA: 29] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022] Open
Abstract
Coenzyme Q (Q or ubiquinone) is a redox-active polyisoprenylated benzoquinone lipid essential for electron and proton transport in the mitochondrial respiratory chain. The aromatic ring 4-hydroxybenzoic acid (4HB) is commonly depicted as the sole aromatic ring precursor in Q biosynthesis despite the recent finding that para-aminobenzoic acid (pABA) also serves as a ring precursor in Saccharomyces cerevisiae Q biosynthesis. In this study, we employed aromatic (13)C6-ring-labeled compounds including (13)C6-4HB, (13)C6-pABA, (13)C6-resveratrol, and (13)C6-coumarate to investigate the role of these small molecules as aromatic ring precursors in Q biosynthesis in Escherichia coli, S. cerevisiae, and human and mouse cells. In contrast to S. cerevisiae, neither E. coli nor the mammalian cells tested were able to form (13)C6-Q when cultured in the presence of (13)C6-pABA. However, E. coli cells treated with (13)C6-pABA generated (13)C6-ring-labeled forms of 3-octaprenyl-4-aminobenzoic acid, 2-octaprenyl-aniline, and 3-octaprenyl-2-aminophenol, suggesting UbiA, UbiD, UbiX, and UbiI are capable of using pABA or pABA-derived intermediates as substrates. E. coli, S. cerevisiae, and human and mouse cells cultured in the presence of (13)C6-resveratrol or (13)C6-coumarate were able to synthesize (13)C6-Q. Future evaluation of the physiological and pharmacological responses to dietary polyphenols should consider their metabolism to Q.
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Affiliation(s)
- Letian X Xie
- Department of Chemistry and Biochemistry and the Molecular Biology Institute, University of California, Los Angeles, CA 90095-1569
| | - Kevin J Williams
- Departments of Microbiology, Immunology, and Molecular Genetics University of California, Los Angeles, CA 90095-1569
| | - Cuiwen H He
- Department of Chemistry and Biochemistry and the Molecular Biology Institute, University of California, Los Angeles, CA 90095-1569
| | - Emily Weng
- Department of Chemistry and Biochemistry and the Molecular Biology Institute, University of California, Los Angeles, CA 90095-1569
| | - San Khong
- Department of Chemistry and Biochemistry and the Molecular Biology Institute, University of California, Los Angeles, CA 90095-1569
| | - Tristan E Rose
- Department of Chemistry and Biochemistry and the Molecular Biology Institute, University of California, Los Angeles, CA 90095-1569
| | - Ohyun Kwon
- Department of Chemistry and Biochemistry and the Molecular Biology Institute, University of California, Los Angeles, CA 90095-1569
| | - Steven J Bensinger
- Departments of Microbiology, Immunology, and Molecular Genetics University of California, Los Angeles, CA 90095-1569 Molecular and Medical Pharmacology, University of California, Los Angeles, CA 90095-1569
| | - Beth N Marbois
- Department of Chemistry and Biochemistry and the Molecular Biology Institute, University of California, Los Angeles, CA 90095-1569
| | - Catherine F Clarke
- Department of Chemistry and Biochemistry and the Molecular Biology Institute, University of California, Los Angeles, CA 90095-1569
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18
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Avalos J, Carmen Limón M. Biological roles of fungal carotenoids. Curr Genet 2014; 61:309-24. [PMID: 25284291 DOI: 10.1007/s00294-014-0454-x] [Citation(s) in RCA: 158] [Impact Index Per Article: 15.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/17/2014] [Revised: 09/12/2014] [Accepted: 09/12/2014] [Indexed: 01/28/2023]
Abstract
Carotenoids are terpenoid pigments widespread in nature, produced by bacteria, fungi, algae and plants. They are also found in animals, which usually obtain them through the diet. Carotenoids in plants provide striking yellow, orange or red colors to fruits and flowers, and play important metabolic and physiological functions, especially relevant in photosynthesis. Their functions are less clear in non-photosynthetic microorganisms. Different fungi produce diverse carotenoids, but the mutants unable to produce them do not exhibit phenotypic alterations in the laboratory, apart of lack of pigmentation. This review summarizes the current knowledge on the functional basis for carotenoid production in fungi. Different lines of evidence support a protective role of carotenoids against oxidative stress and exposure to visible light or UV irradiation. In addition, the carotenoids are intermediary products in the biosynthesis of physiologically active apocarotenoids or derived compounds. This is the case of retinal, obtained from the symmetrical oxidative cleavage of β-carotene. Retinal is the light-absorbing prosthetic group of the rhodopsins, membrane-bound photoreceptors present also in many fungal species. In Mucorales, β-carotene is an intermediary in the synthesis of trisporoids, apocarotenoid derivatives that include the sexual hormones the trisporic acids, and they are also presumably used in the synthesis of sporopollenin polymers. In conclusion, fungi have adapted their ability to produce carotenoids for different non-essential functions, related with stress tolerance or with the synthesis of physiologically active by-products.
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Affiliation(s)
- Javier Avalos
- Departamento de Genética, Universidad de Sevilla, Apartado 1095, 41080, Seville, Spain,
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