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Zhang S, Jia T, Zhang Z, Zou X, Fan S, Lei K, Jiang X, Niu D, Yuan Y, Shang H. Insight into the relationship between S-lignin and fiber quality based on multiple research methods. PLANT PHYSIOLOGY AND BIOCHEMISTRY : PPB 2020; 147:251-261. [PMID: 31884241 DOI: 10.1016/j.plaphy.2019.12.025] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/27/2019] [Revised: 11/18/2019] [Accepted: 12/20/2019] [Indexed: 06/10/2023]
Abstract
Cotton (Gossypium hirsutum) is an important cash crop, providing people with high quality natural fiber. Lignin is the main component of cotton fiber, second only to cellulose. As a main substance filled in the cellulose framework during the secondary wall thickening process, lignin plays a key role in the formation of cotton fiber quality. However, the mechanism behind it is still unclear. In this research, we screened candidate genes involved in lignin biosynthesis based on analysis of cotton genome and transcriptome sequence data. The authenticity of the transcriptome data was verified by qRT-PCR assay. Total 62 genes were identified from nine gene families. In the process, we found the key gene GhCAD7 that affects the biosynthesis of S-lignin and the ratio of syringyl/guaiacyl (S/G). In addition, in combination with the metabolites and transcriptome profiles of the line 0-153 with high fiber quality and the line sGK9708 with low fiber quality during cotton fiber development, we speculate that the ratio of syringyl/guaiacyl (S/G) is inseparable from the quality of cotton fiber. Finally, the S-type lignin synthesis branch may play a more important role in the formation of high-quality fiber. This work provides insights into the synthesis of lignin in cotton and lays the foundation for future research into improving fiber quality.
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Affiliation(s)
- Shuya Zhang
- State Key Laboratory of Cotton Biology, Key Laboratory of Biological and Genetic Breeding of Cotton, The Ministry of Agriculture, Institute of Cotton Research, Chinese Academy of Agricultural Sciences, Anyang, 455000, Henan, China
| | - Tingting Jia
- State Key Laboratory of Cotton Biology, Key Laboratory of Biological and Genetic Breeding of Cotton, The Ministry of Agriculture, Institute of Cotton Research, Chinese Academy of Agricultural Sciences, Anyang, 455000, Henan, China
| | - Zhen Zhang
- State Key Laboratory of Cotton Biology, Key Laboratory of Biological and Genetic Breeding of Cotton, The Ministry of Agriculture, Institute of Cotton Research, Chinese Academy of Agricultural Sciences, Anyang, 455000, Henan, China
| | - Xianyan Zou
- State Key Laboratory of Cotton Biology, Key Laboratory of Biological and Genetic Breeding of Cotton, The Ministry of Agriculture, Institute of Cotton Research, Chinese Academy of Agricultural Sciences, Anyang, 455000, Henan, China
| | - Senmiao Fan
- State Key Laboratory of Cotton Biology, Key Laboratory of Biological and Genetic Breeding of Cotton, The Ministry of Agriculture, Institute of Cotton Research, Chinese Academy of Agricultural Sciences, Anyang, 455000, Henan, China
| | - Kang Lei
- State Key Laboratory of Cotton Biology, Key Laboratory of Biological and Genetic Breeding of Cotton, The Ministry of Agriculture, Institute of Cotton Research, Chinese Academy of Agricultural Sciences, Anyang, 455000, Henan, China
| | - Xiao Jiang
- State Key Laboratory of Cotton Biology, Key Laboratory of Biological and Genetic Breeding of Cotton, The Ministry of Agriculture, Institute of Cotton Research, Chinese Academy of Agricultural Sciences, Anyang, 455000, Henan, China
| | - Doudou Niu
- State Key Laboratory of Cotton Biology, Key Laboratory of Biological and Genetic Breeding of Cotton, The Ministry of Agriculture, Institute of Cotton Research, Chinese Academy of Agricultural Sciences, Anyang, 455000, Henan, China
| | - Youlu Yuan
- State Key Laboratory of Cotton Biology, Key Laboratory of Biological and Genetic Breeding of Cotton, The Ministry of Agriculture, Institute of Cotton Research, Chinese Academy of Agricultural Sciences, Anyang, 455000, Henan, China; School of Agricultural Sciences, Zhengzhou University, Zhengzhou, 450001, Henan, China.
| | - Haihong Shang
- State Key Laboratory of Cotton Biology, Key Laboratory of Biological and Genetic Breeding of Cotton, The Ministry of Agriculture, Institute of Cotton Research, Chinese Academy of Agricultural Sciences, Anyang, 455000, Henan, China; School of Agricultural Sciences, Zhengzhou University, Zhengzhou, 450001, Henan, China.
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2
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Bagniewska-Zadworna A, Barakat A, Łakomy P, Smoliński DJ, Zadworny M. Lignin and lignans in plant defence: insight from expression profiling of cinnamyl alcohol dehydrogenase genes during development and following fungal infection in Populus. PLANT SCIENCE : AN INTERNATIONAL JOURNAL OF EXPERIMENTAL PLANT BIOLOGY 2014; 229:111-121. [PMID: 25443838 DOI: 10.1016/j.plantsci.2014.08.015] [Citation(s) in RCA: 39] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/03/2014] [Revised: 08/21/2014] [Accepted: 08/22/2014] [Indexed: 05/18/2023]
Abstract
Cinnamyl alcohol dehydrogenase (CAD) catalyses the final step in the biosynthesis of monolignol, the main component of lignin. Lignins, deposited in the secondary cell wall, play a role in plant defence against pathogens. We re-analysed the phylogeny of CAD/CAD-like genes using sequences from recently sequenced genomes, and analysed the temporal and spatial expression profiles of CAD/CAD-like genes in Populus trichocarpa healthy and infected plants. Three fungal pathogens (Rhizoctonia solani, Fusarium oxysporum, and Cytospora sp.), varying in lifestyle and pathogenicity, were used for plant infection. Phylogenetic analyses showed that CAD/CAD-like genes were distributed in classes represented by all members from angiosperm lineages including basal angiosperms and Selaginella. The analysed genes showed different expression profiles during development and demonstrated that three genes were involved in primary xylem maturation while five may function in secondary xylem formation. Expression analysis following inoculation with fungal pathogens, showed that five genes were induced in either stem or leaves. These results add further evidence that CAD/CAD-like genes have evolved specialised functions in plant development and defence against various pest and pathogens. Two genes (PoptrCAD11 and PoptrCAD15), which were induced under various stresses, could be treated as universal markers of plant defence using lignification or lignan biosynthesis.
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Affiliation(s)
- Agnieszka Bagniewska-Zadworna
- Department of General Botany, Institute of Experimental Biology, Faculty of Biology, A. Mickiewicz University, Umultowska 89, 61-614 Poznań, Poland.
| | - Abdelali Barakat
- Department of Biology, University of South Dakota, 414 E. Clark Street, Vermillion, SD 57069, USA.
| | - Piotr Łakomy
- Department of Forest Pathology, Faculty of Forestry, Poznań University of Life Sciences, Wojska Polskiego 71c, 60-625 Poznań, Poland
| | - Dariusz J Smoliński
- Department of Cell Biology, Faculty of Biology and Environment Protection, Nicolaus Copernicus University, Lwowska 1, 87-100 Toruń, Poland
| | - Marcin Zadworny
- Institute of Dendrology, Polish Academy of Sciences, Parkowa 5, 62-035 Kórnik, Poland
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Bukh C, Nord-Larsen PH, Rasmussen SK. Phylogeny and structure of the cinnamyl alcohol dehydrogenase gene family in Brachypodium distachyon. JOURNAL OF EXPERIMENTAL BOTANY 2012; 63:6223-36. [PMID: 23028019 PMCID: PMC3481213 DOI: 10.1093/jxb/ers275] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
Abstract
Cinnamyl alcohol dehydrogenase (CAD) catalyses the final step of the monolignol biosynthesis, the conversion of cinnamyl aldehydes to alcohols, using NADPH as a cofactor. Seven members of the CAD gene family were identified in the genome of Brachypodium distachyon and five of these were isolated and cloned from genomic DNA. Semi-quantitative reverse-transcription PCR revealed differential expression of the cloned genes, with BdCAD5 being expressed in all tissues and highest in root and stem while BdCAD3 was only expressed in stem and spikes. A phylogenetic analysis of CAD-like proteins placed BdCAD5 on the same branch as bona fide CAD proteins from maize (ZmCAD2), rice (OsCAD2), sorghum (SbCAD2) and Arabidopsis (AtCAD4, 5). The predicted three-dimensional structures of both BdCAD3 and BdCAD5 resemble that of AtCAD5. However, the amino-acid residues in the substrate-binding domains of BdCAD3 and BdCAD5 are distributed symmetrically and BdCAD3 is similar to that of poplar sinapyl alcohol dehydrogenase (PotSAD). BdCAD3 and BdCAD5 expressed and purified from Escherichia coli both showed a temperature optimum of about 50 °C and molar weight of 49 kDa. The optimal pH for the reduction of coniferyl aldehyde were pH 5.2 and 6.2 and the pH for the oxidation of coniferyl alcohol were pH 8 and 9.5, for BdCAD3 and BdCAD5 respectively. Kinetic parameters for conversion of coniferyl aldehyde and coniferyl alcohol showed that BdCAD5 was clearly the most efficient enzyme of the two. These data suggest that BdCAD5 is the main CAD enzyme for lignin biosynthesis and that BdCAD3 has a different role in Brachypodium. All CAD enzymes are cytosolic except for BdCAD4, which has a putative chloroplast signal peptide adding to the diversity of CAD functions.
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Abstract
Ripening of fleshy fruit is a differentiation process involving biochemical and biophysical changes that lead to the accumulation of sugars and subsequent changes in tissue texture. Also affected are phenolic compounds, which confer color, flavor/aroma, and resistance to pathogen invasion and adverse environmental conditions. These phenolic compounds, which are the products of branches of the phenylpropanoid pathway, appear to be closely linked to fruit ripening processes. Three key enzymes of the phenylpropanoid pathway, namely phenylalanine ammonia lyase, O-methyltransferase, and cinnamyl alcohol dehydrogenase (CAD) have been reported to modulate various end products including lignin and protect plants against adverse conditions. In addition, peroxidase, the enzyme following CAD in the phenylpropanoid pathway, has also been associated with injury, wound repair, and disease resistance. However, the role of these enzymes in fruit ripening is a matter of only recent investigation and information is lacking on the relationships between phenylpropanoid metabolism and fruit ripening processes. Understanding the role of these enzymes in fruit ripening and their manipulation may possibly be valuable for delineating the regulatory network that controls the expression of ripening genes in fruit. This review elucidates the functional characterization of these key phenylpropanoid biosynthetic enzymes/genes during fruit ripening processes.
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Affiliation(s)
- Rupinder Singh
- Authors Singh and Dwivedi are with Dept. of Biochemistry, Lucknow Univ., Lucknow 226007, India. Author Rastogi is with Dept. of Biotechnology, Integral Univ., Lucknow 226026, India. Direct inquiries to author Dwivedi (E-mail: )
| | - Smita Rastogi
- Authors Singh and Dwivedi are with Dept. of Biochemistry, Lucknow Univ., Lucknow 226007, India. Author Rastogi is with Dept. of Biotechnology, Integral Univ., Lucknow 226026, India. Direct inquiries to author Dwivedi (E-mail: )
| | - Upendra N Dwivedi
- Authors Singh and Dwivedi are with Dept. of Biochemistry, Lucknow Univ., Lucknow 226007, India. Author Rastogi is with Dept. of Biotechnology, Integral Univ., Lucknow 226026, India. Direct inquiries to author Dwivedi (E-mail: )
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Lam SK, Ng TB. Isolation and characterization of a French bean hemagglutinin with antitumor, antifungal, and anti-HIV-1 reverse transcriptase activities and an exceptionally high yield. PHYTOMEDICINE : INTERNATIONAL JOURNAL OF PHYTOTHERAPY AND PHYTOPHARMACOLOGY 2010; 17:457-462. [PMID: 19740639 DOI: 10.1016/j.phymed.2009.07.017] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/12/2009] [Revised: 06/22/2009] [Accepted: 07/20/2009] [Indexed: 05/28/2023]
Abstract
A dimeric 64-kDa hemagglutinin was isolated with a high yield from dried Phaseolus vulgaris cultivar "French bean number 35" seeds using a chromatographic protocol that involved Blue-Sepharose, Q-Sepharose, and Superdex 75. The yield was exceptionally high (1.1g hemagglutinin per 100g seed), which is around 10-85 times higher than other Phaseolus cultivars. Its N-terminal sequence resembled those of other Phaseolus hemagglutinins. The hemagglutinating activity of the hemagglutinin was stable in the pH range 6-8, and in the temperature range 0 degrees C-50 degrees C. It inhibited HIV-1 reverse transcriptase with an IC50 of 2microM. It suppressed mycelial growth in Valsa mali with an IC50 of 10microM. It inhibited proliferation of hepatoma HepG2 cells and breast cancer MCF-7 cells with an IC50 of 100 and 2microM, respectively. It had no antiproliferative effect on normal embryonic liver WRL68 cells.
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Affiliation(s)
- S K Lam
- Department of Biochemistry, Faculty of Medicine, The Chinese University of Hong Kong, Shatin, New Territories, Hong Kong, China.
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6
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Fan L, Shi WJ, Hu WR, Hao XY, Wang DM, Yuan H, Yan HY. Molecular and biochemical evidence for phenylpropanoid synthesis and presence of wall-linked phenolics in cotton fibers. JOURNAL OF INTEGRATIVE PLANT BIOLOGY 2009; 51:626-37. [PMID: 19566641 DOI: 10.1111/j.1744-7909.2009.00840.x] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/15/2023]
Abstract
The mature cotton (Gossypium hirsutum L.) fiber is a single cell with a typically thickened secondary cell wall. The aim of this research was to use molecular, spectroscopic and chemical techniques to investigate the possible occurrence of previously overlooked accumulation of phenolics during secondary cell wall formation in cotton fibers. Relative quantitative reverse transcription-polymerase chain reaction analysis showed that GhCAD6 and GhCAD1 were predominantly expressed among seven gene homologs, only GhCAD6 was up-regulated during secondary wall formation in cotton fibers. Phylogenic analysis revealed that GhCAD6 belonged to Class I and was proposed to have a major role in monolignol biosynthesis, and GhCAD1 belonged to Class III and was proposed to have a compensatory mechanism for monolignol biosynthesis. Amino acid sequence comparison showed that the cofactor binding sites of GhCADs were highly conserved with high similarity and identity to bona fide cinnamyl alcohol dehydrogenases. The substrate binding site of GhCAD1 is different from GhCAD6. This difference was confirmed by the different catalytic activities observed with the enzymes. Cell wall auto-fluorescence, Fourier transform infrared spectroscopy (FTIR), high-performance liquid chromatography (HPLC) and chemical analyses confirmed that phenolic compounds were bound to the cell walls of mature cotton fibers. Our findings may suggest a potential for genetic manipulation of cotton fiber properties, which are of central importance to agricultural, cotton processing and textile industries.
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Affiliation(s)
- Ling Fan
- Institute of Nuclear and Biological Technologies, Xinjiang Academy of Agricultural Sciences, Urumqi 830091, China.
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7
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Gross GG. From lignins to tannins: forty years of enzyme studies on the biosynthesis of phenolic compounds. PHYTOCHEMISTRY 2008; 69:3018-31. [PMID: 17559893 DOI: 10.1016/j.phytochem.2007.04.031] [Citation(s) in RCA: 38] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/12/2007] [Revised: 04/09/2007] [Accepted: 04/23/2007] [Indexed: 05/15/2023]
Abstract
In the early 1960s, enzyme studies increasingly began to replace the common 'feeding' experiments in which labeled tracers were applied to living plants or plant parts for elucidating metabolic pathways. This advanced technique allowed to gain much deeper insights into individual details of metabolic sequences, and particularly on the previously inaccessible role of activated 'energy-rich' intermediates. Based on the author's own experience for the past 40+ years in this field, principal findings and trends elucidating the pathways to lignin and lignin precursors, acyl amides and hydrolyzable tannins (gallotannins, ellagitannins) by enzyme studies are reported.
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Affiliation(s)
- Georg G Gross
- Molekulare Botanik, Universität Ulm, 89069 Ulm, Germany.
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8
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Sibout R, Eudes A, Mouille G, Pollet B, Lapierre C, Jouanin L, Séguin A. CINNAMYL ALCOHOL DEHYDROGENASE-C and -D are the primary genes involved in lignin biosynthesis in the floral stem of Arabidopsis. THE PLANT CELL 2005; 17:2059-76. [PMID: 15937231 PMCID: PMC1167552 DOI: 10.1105/tpc.105.030767] [Citation(s) in RCA: 86] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/02/2023]
Abstract
During lignin biosynthesis in angiosperms, coniferyl and sinapyl aldehydes are believed to be converted into their corresponding alcohols by cinnamyl alcohol dehydrogenase (CAD) and by sinapyl alcohol dehydrogenase (SAD), respectively. This work clearly shows that CAD-C and CAD-D act as the primary genes involved in lignin biosynthesis in the floral stem of Arabidopsis thaliana by supplying both coniferyl and sinapyl alcohols. An Arabidopsis CAD double mutant (cad-c cad-d) resulted in a phenotype with a limp floral stem at maturity as well as modifications in the pattern of lignin staining. Lignin content of the mutant stem was reduced by 40%, with a 94% reduction, relative to the wild type, in conventional beta-O-4-linked guaiacyl and syringyl units and incorportion of coniferyl and sinapyl aldehydes. Fourier transform infrared spectroscopy demonstrated that both xylem vessels and fibers were affected. GeneChip data and real-time PCR analysis revealed that transcription of CAD homologs and other genes mainly involved in cell wall integrity were also altered in the double mutant. In addition, molecular complementation of the double mutant by tissue-specific expression of CAD derived from various species suggests different abilities of these genes/proteins to produce syringyl-lignin moieties but does not indicate a requirement for any specific SAD gene.
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Affiliation(s)
- Richard Sibout
- Natural Resources Canada, Canadian Forest Service, Laurentian Forestry Centre, Sainte-Foy, QC G1V 4C7, Canada
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9
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Mee B, Kelleher D, Frias J, Malone R, Tipton KF, Henehan GTM, Windle HJ. Characterization of cinnamyl alcohol dehydrogenase of Helicobacter pylori. An aldehyde dismutating enzyme. FEBS J 2005; 272:1255-64. [PMID: 15720399 DOI: 10.1111/j.1742-4658.2005.04561.x] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Cinnamyl alcohol dehydrogenases (CAD; 1.1.1.195) catalyse the reversible conversion of p-hydroxycinnamaldehydes to their corresponding alcohols, leading to the biosynthesis of lignin in plants. Outside of plants their role is less defined. The gene for cinnamyl alcohol dehydrogenase from Helicobacter pylori (HpCAD) was cloned in Escherichia coli and the recombinant enzyme characterized for substrate specificity. The enzyme is a monomer of 42.5 kDa found predominantly in the cytosol of the bacterium. It is specific for NADP(H) as cofactor and has a broad substrate specificity for alcohol and aldehyde substrates. Its substrate specificity is similar to the well-characterized plant enzymes. High substrate inhibition was observed and a mechanism of competitive inhibition proposed. The enzyme was found to be capable of catalysing the dismutation of benzaldehyde to benzyl alcohol and benzoic acid. This dismutation reaction has not been shown previously for this class of alcohol dehydrogenase and provides the bacterium with a means of reducing aldehyde concentration within the cell.
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Affiliation(s)
- Blanaid Mee
- School of Food Science and Environmental Health, Dublin Institute of Technology, Ireland
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10
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Anterola AM, Jeon JH, Davin LB, Lewis NG. Transcriptional control of monolignol biosynthesis in Pinus taeda: factors affecting monolignol ratios and carbon allocation in phenylpropanoid metabolism. J Biol Chem 2002; 277:18272-80. [PMID: 11891223 DOI: 10.1074/jbc.m112051200] [Citation(s) in RCA: 110] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
Transcriptional profiling of the phenylpropanoid pathway in Pinus taeda cell suspension cultures was carried out using quantitative real time PCR analyses of all known genes involved in the biosynthesis of the two monolignols, p-coumaryl and coniferyl alcohols (lignin/lignan precursors). When the cells were transferred to a medium containing 8% sucrose and 20 mm potassium iodide, the monolignol/phenylpropanoid pathway was induced, and transcript levels for phenylalanine ammonia lyase, cinnamate 4-hydroxylase, p-coumarate 3-hydroxylase, 4-coumarate:CoA ligase, caffeoyl-CoA O-methyltransferase, cinnamoyl-CoA reductase, and cinnamyl alcohol dehydrogenase were coordinately up-regulated. Provision of increasing levels of exogenously supplied Phe to saturating levels (40 mm) to the induction medium resulted in further up-regulation of their transcript levels in the P. taeda cell cultures; this in turn was accompanied by considerable increases in both p-coumaryl and coniferyl alcohol formation and excretion. By contrast, transcript levels for both cinnamate 4-hydroxylase and p-coumarate 3-hydroxylase were only slightly up-regulated. These data, when considered together with metabolic profiling results and genetic manipulation of various plant species, reveal that carbon allocation to the pathway and its differential distribution into the two monolignols is controlled by Phe supply and differential modulation of cinnamate 4-hydroxylase and p-coumarate 3-hydroxylase activities, respectively. The coordinated up-regulation of phenylalanine ammonia lyase, 4-coumarate:CoA ligase, caffeoyl-CoA O-methyltransferase, cinnamoyl-CoA reductase and cinnamyl alcohol dehydrogenase in the presence of increasing concentrations of Phe also indicates that these steps are not truly rate-limiting, because they are modulated according to metabolic demand. Finally, the transcript profile of a putative acid/ester O-methyltransferase, proposed as an alternative catalyst for O-methylation leading to coniferyl alcohol, was not up-regulated under any of the conditions employed, suggesting that it is not, in fact, involved in monolignol biosynthesis.
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Affiliation(s)
- Aldwin M Anterola
- Institute of Biological Chemistry, Washington State University, Pullman, Washington 99164-6340, USA
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11
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Regulation of Phenylpropanoid Metabolism in Relation to Lignin Biosynthesis in Plants. INTERNATIONAL REVIEW OF CYTOLOGY 1997. [DOI: 10.1016/s0074-7696(08)62362-1] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/03/2022]
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Somssich IE, Wernert P, Kiedrowski S, Hahlbrock K. Arabidopsis thaliana defense-related protein ELI3 is an aromatic alcohol:NADP+ oxidoreductase. Proc Natl Acad Sci U S A 1996; 93:14199-203. [PMID: 11038530 PMCID: PMC19517 DOI: 10.1073/pnas.93.24.14199] [Citation(s) in RCA: 67] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
We expressed a cDNA encoding the Arabidopsis thaliana defense-related protein ELI3-2 in Escherichia coli to determine its biochemical function. Based on a protein database search, this protein was recently predicted to be a mannitol dehydrogenase [Williamson, J. D., Stoop, J. M. H., Massel, M. O., Conkling, M. A. & Pharr, D. M. (1995) Proc. Natl. Acad. Sci. USA 92, 7148-7152]. Studies on the substrate specificity now revealed that ELI3-2 is an aromatic alcohol: NADP+ oxidoreductase (benzyl alcohol dehydrogenase). The enzyme showed a strong preference for various aromatic aldehydes as opposed to the corresponding alcohols. Highest substrate affinities were observed for 2-methoxybenzaldehyde, 3-methoxybenzaldehyde, salicylaldehyde, and benzaldehyde, in this order, whereas mannitol dehydrogenase activity could not be detected. These and previous results support the notion that ELI3-2 has an important role in resistance-related aromatic acid-derived metabolism.
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Affiliation(s)
- I E Somssich
- Max Planck Institut für Züchtungsforschung, Department of Biochemistry, D-50829 Köln, Germany
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13
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Lauvergeat V, Kennedy K, Feuillet C, McKie JH, Gorrichon L, Baltas M, Boudet AM, Grima-Pettenati J, Douglas KT. Site-directed mutagenesis of a serine residue in cinnamyl alcohol dehydrogenase, a plant NADPH-dependent dehydrogenase, affects the specificity for the coenzyme. Biochemistry 1995; 34:12426-34. [PMID: 7547988 DOI: 10.1021/bi00038a041] [Citation(s) in RCA: 41] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/25/2023]
Abstract
Using recombinant cinnamyl alcohol dehydrogenase isoform 2 (CAD2, EC 1.1.1.195), an NADPH-dependent aromatic alcohol dehydrogenase involved in lignification in vascular plants, we have investigated the detailed steady-state kinetic mechanism of CAD2 and the role of a serine residue in determining the cofactor specificity of CAD2. Site-directed mutagenesis (S212D) and overexpression of the WT and mutant S212D forms of CAD2 in Escherichia coli, followed by kinetic studies on the purified WT and mutant proteins, confirmed the involvement of S212D in recognizing the phosphate group of NADPH and provided information on the structural requirements for NADPH specificity. From substrate kinetic patterns and product inhibition studies both WT and S212D mutant forms of CAD2 have been shown to follow rapid equilibrium random bireactant kinetics with the value of the interaction factor (alpha) for WT (0.25) being significantly less than that for S212D CAD2 (0.45). The changes in binding energy arising from the mutation on the binding of the 2'-phosphate site of the coenzyme were assessed. A marked degree of physical interaction was detected between the enzymatic binding sites of the coniferyl alcohol substrate and the 2'-phosphate binding region, which are quite distant in the three-dimensional structure. The inhibition by 2',5'-ADP and 5'-AMP was found to be weak for both WT and S212D CAD2. Strong substrate inhibition was detected for CAD2, and its implications for plant physiological studies were assessed.(ABSTRACT TRUNCATED AT 250 WORDS)
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Affiliation(s)
- V Lauvergeat
- Signaux et Messages cellulaires chez les végétaux, URA CNRS 1941, Université Paul Sabatier, Toulouse, France
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Boudet AM, Lapierre C, Grima-Pettenati J. Biochemistry and molecular biology of lignification. THE NEW PHYTOLOGIST 1995; 129:203-236. [PMID: 33874561 DOI: 10.1111/j.1469-8137.1995.tb04292.x] [Citation(s) in RCA: 101] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/28/2023]
Abstract
Lignins, which result from the dehydrogenative polymerization of cinnamyl alcohols, are complex heteropolymers deposited in the walls of specific cells of higher plants. Lignins have probably been associated to land colonization by plants but several aspects concerning their biosynthesis, structure and function are still only partially understood. This review focuses on the modern physicochemical methods of structural analysis of lignins, and on the new approaches of molecular biology and genetic engineering applied to lignification. The principles, advantages and limitations of three important analytical tools for studying lignin structure are presented. They include carbon 13 nuclear magnetic resonance, analytical pyrolysis and thioacidolysis. The use of these methods is illustrated by several examples concerning the characterization of grass lignins,'lignin-like'materials in protection barriers of plants and lignins produced by cell suspension cultures. Our present limited knowledge of the spatio temporal deposition of lignins during cell wall differentiation including the nature of the wall components associated to lignin deposition and of the cross-links between the different wall polymers is briefly reviewed. Emphasis is placed on the phenylpropanoid pathway enzymes and their corresponding genes which are described in relation to their potential roles in the quantitative and qualitative control of lignification. Recent findings concerning the promoter sequence elements responsible for the vascular expression of some of these genes are presented. A section is devoted to the enzymes specifically involved in the synthesis of monolignols: cinnamoyl CoA reductase and cinnamyl alcohol dehydrogenase. The recent characterization of the corresponding cDNAs/genes offers new possibilities for a better understanding of the regulation of lignification. Finally, at the level of the synthesis, the potential involvement of peroxidases and laccases in the polymerization of monolignols is critically discussed. In addition to previously characterized naturally occurring lignin mutants, induced lignin mutants have been obtained during the last years through genetic engineering. Some examples include plants transformed by O-methyltransferase and cinnamyl alcohol dehydrogenase antisense constructs which exhibit modified lignins. Such strategies offer promising perspectives in gaining a better understanding of lignin metabolism and functions and represent a realistic way to improve plant biomass. Contents Summary 203 I. Introduction 204 II. Main structural features of lignins 205 III. Lignification and cell wall differentiation: spatio-temporal deposition of lignins and inter-relations with other wall components 213 IV. Enzymes and genes involved in the biosynthesis and polymerization of monolignols 216 V. Lignin mutants as a way to improve plant biomass and to explore lignin biochemistry and metabolism 226 VI. Concluding remarks 229 Acknowledgements 230 References 230.
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Affiliation(s)
- A M Boudet
- Centre de Biologic et Physiologic Végétales, URA CNRS 1941, Université Paul Sabatier, 118 route de Narbonne, 31062 Toulouse Cedex, France
| | - C Lapierre
- Laboratoire de Chimie Biologique, INRA-Grignon, 78850 Thiverval-Grignon, France
| | - J Grima-Pettenati
- Centre de Biologic et Physiologic Végétales, URA CNRS 1941, Université Paul Sabatier, 118 route de Narbonne, 31062 Toulouse Cedex, France
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