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Kunishima M, Yamauchi Y, Mizutani M, Kuse M, Takikawa H, Sugimoto Y. Identification of (Z)-3:(E)-2-Hexenal Isomerases Essential to the Production of the Leaf Aldehyde in Plants. J Biol Chem 2016; 291:14023-14033. [PMID: 27129773 DOI: 10.1074/jbc.m116.726687] [Citation(s) in RCA: 48] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/10/2016] [Indexed: 11/06/2022] Open
Abstract
The green odor of plants is characterized by green leaf volatiles (GLVs) composed of C6 compounds. GLVs are biosynthesized from polyunsaturated fatty acids in thylakoid membranes by a series of enzymes. A representative member of GLVs (E)-2-hexenal, known as the leaf aldehyde, has been assumed to be produced by isomerization from (Z)-3-hexenal in the biosynthesis pathway; however, the enzyme has not yet been identified. In this study, we purified the (Z)-3:(E)-2-hexenal isomerase (HI) from paprika fruits and showed that various plant species have homologous HIs. Purified HI is a homotrimeric protein of 110 kDa composed of 35-kDa subunits and shows high activity at acidic and neutral pH values. Phylogenetic analysis showed that HIs belong to the cupin superfamily, and at least three catalytic amino acids (His, Lys, Tyr) are conserved in HIs of various plant species. Enzymatic isomerization of (Z)-3-hexenal in the presence of deuterium oxide resulted in the introduction of deuterium at the C4 position of (E)-2-hexenal, and a suicide substrate 3-hexyn-1-al inhibited HI irreversibly, suggesting that the catalytic mode of HI is a keto-enol tautomerism reaction mode mediated by a catalytic His residue. The gene expression of HIs in Solanaceae plants was enhanced in specific developmental stages and by wounding treatment. Transgenic tomato plants overexpressing paprika HI accumulated (E)-2-hexenal in contrast to wild-type tomato plants mainly accumulating (Z)-3-hexenal, suggesting that HI plays a key role in the production of (E)-2-hexenal in planta.
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Affiliation(s)
- Mikiko Kunishima
- Graduate School of Agricultural Science, Kobe University, 1-1 Rokkodai, Nada, Kobe 657-8501, Japan
| | - Yasuo Yamauchi
- Graduate School of Agricultural Science, Kobe University, 1-1 Rokkodai, Nada, Kobe 657-8501, Japan.
| | - Masaharu Mizutani
- Graduate School of Agricultural Science, Kobe University, 1-1 Rokkodai, Nada, Kobe 657-8501, Japan
| | - Masaki Kuse
- Graduate School of Agricultural Science, Kobe University, 1-1 Rokkodai, Nada, Kobe 657-8501, Japan
| | - Hirosato Takikawa
- Graduate School of Agricultural Science, Kobe University, 1-1 Rokkodai, Nada, Kobe 657-8501, Japan
| | - Yukihiro Sugimoto
- Graduate School of Agricultural Science, Kobe University, 1-1 Rokkodai, Nada, Kobe 657-8501, Japan
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Yamauchi Y, Kunishima M, Mizutani M, Sugimoto Y. Reactive short-chain leaf volatiles act as powerful inducers of abiotic stress-related gene expression. Sci Rep 2015; 5:8030. [PMID: 25619826 PMCID: PMC4306126 DOI: 10.1038/srep08030] [Citation(s) in RCA: 71] [Impact Index Per Article: 7.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/31/2014] [Accepted: 12/17/2014] [Indexed: 01/19/2023] Open
Abstract
Abiotic stresses cause serious damage to plants; therefore, plants undergo a complicated stress response through signal transduction originating from environmental stimuli. Here we show that a subset of short-chain leaf volatiles with an α, β-unsaturated carbonyl bond in their structure (reactive short-chain leaf volatiles, RSLVs) like (E)-2-hexenal and (E)-2-butenal can act as signal chemicals that strongly induce the gene expression of abiotic-related transcription factors, such as heat stress-related transcription factors (HSFA2, MBF1c) and other abiotic stress-related transcription factors (DREB2A, ZATs). RSLV-induced expression of HSFA2 and MBF1c was eliminated in HSFA1s-, known as heat stress response master regulators, knockout mutant, whereas those of DREB2A and ZATs were not, suggesting that the RSLV signaling pathway is composed of HSFA1-dependent and -independent pathways. RSLV treatment induced production of chaperon proteins, and the RSLV-treated Arabidopsis thus demonstrated enhanced abiotic stress tolerance. Because oxidative stress treatment enhanced RSLV production, we concluded that commonly found RSLVs produced by environmental stresses are powerful inducer of abiotic stress-related gene expression as oxidative stress signals.
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Affiliation(s)
- Yasuo Yamauchi
- Graduate School of Agricultural Science, Kobe University, Rokkodai 1-1, Nada, Hyogo 657-8501, Japan
| | - Mikiko Kunishima
- Graduate School of Agricultural Science, Kobe University, Rokkodai 1-1, Nada, Hyogo 657-8501, Japan
| | - Masaharu Mizutani
- Graduate School of Agricultural Science, Kobe University, Rokkodai 1-1, Nada, Hyogo 657-8501, Japan
| | - Yukihiro Sugimoto
- Graduate School of Agricultural Science, Kobe University, Rokkodai 1-1, Nada, Hyogo 657-8501, Japan
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Kunishima M, Yoshimura K, Morigaki H, Kawamata R, Terao K, Tani S. Cyclodextrin-based artificial acyltransferase: substrate-specific catalytic amidation of carboxylic acids in aqueous solvent. J Am Chem Soc 2001; 123:10760-1. [PMID: 11674018 DOI: 10.1021/ja011660m] [Citation(s) in RCA: 43] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- M Kunishima
- Faculty of Pharmaceutical Sciences and High Technology Research Center, Kobe Gakuin University, Kobe 651-2180, Japan
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Kunishima M, Nakata D, Sakuma T, Kono K, Sato S, Tani S. Reduction of acetals with samarium diiodide in acetonitrile in the presence of Lewis acids. Chem Pharm Bull (Tokyo) 2001; 49:97-100. [PMID: 11201233 DOI: 10.1248/cpb.49.97] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Transformation of acetals into ethers by partial reduction using a samarium diiodide-Lewis acids-acetonitrile system is described. The reaction with aromatic acetals occurred in good yields in the presence of aluminum chloride (2 eq) whereas the corresponding aliphatic, vinylic, and alkynyl derivatives did not afford ethers under the same conditions. Beta-elimination to give an enol ether becomes predominant when aliphatic acetals that possess a hydrogen at the 2-position are treated with iodotrimethylsilane in the presence of SmI2 or SmI3.
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Affiliation(s)
- M Kunishima
- Faculty of Pharmaceutical Sciences and High Technology Research Center, Kobe Gakuin University, Japan.
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Abstract
We constructed primers for multiplex polymerase chain reaction (PCR) to detect verotoxin-producing Escherichia coli (VTEC) O157:H7. The multiplex PCR primers were designed from the sequence of the flagellin structural gene of Escherichia coli flagellar type H7 (GenBank under accession number L07388), and from the sequence of the rfbE gene of Escherichia coli O157:H7 (GenBank under accession number S83460). In addition to these primers, we used a primer pair reported by Karch and Meyer (J. Clin. Microbiol. 27: 2751-2757, 1989) to amplify various VT genes from VTEC. All of the examined specimens (18 isolates) of VT-producing E. coli O157:H7 showed a positive result by the multiplex PCR test with the three sets of primers. The sensitivity of detection for VT-producing E. coli O157:H7 was shown to be at least 3,000 cells per PCR tube.
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Affiliation(s)
- I Nagano
- Department of Parasitology, Gifu University School of Medicine, Japan
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Itoh Y, Nagano I, Kunishima M, Ezaki T. Laboratory investigation of enteroaggregative Escherichia coli O untypeable:H10 associated with a massive outbreak of gastrointestinal illness. J Clin Microbiol 1997; 35:2546-50. [PMID: 9316905 PMCID: PMC230008 DOI: 10.1128/jcm.35.10.2546-2550.1997] [Citation(s) in RCA: 149] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023] Open
Abstract
A massive outbreak of gastrointestinal illness occurred in Tajimi city, Gifu prefecture, in June of 1993 in which 2,697 children in elementary and junior high schools developed severe diarrhea. Stool specimens from 30 children with severe protracted diarrhea were studied. Twenty-seven strains of enteroaggregative Escherichia coli (EAggEC) isolated from 12 of 30 patients all belonged to the same serotype, O untypeable (OUT):H10, and showed the same biochemical characteristics and antibiotic susceptibility pattern. These strains were negative for the virulence factors of the four standard categories of diarrheagenic E. coli (enterotoxigenic, enteropathogenic, enteroinvasive, and enterohemorrhagic). However, the isolates showed an aggregative pattern of adherence to HEp-2 cells and had a 60-MDa plasmid and an astA gene, which encodes heat-stable enterotoxin-1 production. These data suggested that the EAggEC serotype OUT:H10 was associated with this massive outbreak of gastrointestinal illness.
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Affiliation(s)
- Y Itoh
- Department of Microbiology, Gifu University School of Medicine, Japan.
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Endo A, Hasumi K, Nakamura T, Kunishima M, Masuda M. Dihydromonacolin L and monacolin X, new metabolites which inhibit cholesterol biosynthesis. J Antibiot (Tokyo) 1985; 38:321-7. [PMID: 3839224 DOI: 10.7164/antibiotics.38.321] [Citation(s) in RCA: 58] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
Abstract
Dihydromonacolin L and monacolin X those are structurally related to monacolin K, a potent inhibitor of cholesterol biosynthesis, were isolated from cultures of a mutant of Monascus ruber. The structures of these two metabolites were determined by a combination of physical techniques. Data for dihydromonacolin L and monacolin X as inhibitors of hydroxymethylglutaryl-CoA reductase and sterol biosynthesis in vitro are also given.
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Kunishima M, Yabuuchi M, Masuda M, Imazumi K, Hamano H. [Preparation of highly purified cephamycin C]. Jpn J Antibiot 1982; 35:1699-1700. [PMID: 7176069] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 05/21/2023]
Abstract
Preparation of highly purified cephamycin C (CM-C) is described in this report. The purification of CM-C was carried out by Sephadex LH-20 chromatography of the N-BOC-CM-C developed with MeOH followed by removal of the protecting group. Partially purified CM-C was further refined by Sephadex LH-20 chromatography developed with MeOH and Diaion HP-20 SS chromatography developed with H2O. CM-C thus obtained showed the UV absorption at 265 nm [E1% 1cm 184.4 (H2O)] which is the strongest absorption ever appeared in the literatures.
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Kunishima M, Sugiura Y, Takimoto M, Tanaka H. Effect of inorganic sulfur and selenium on O2-uptake and aniline hydroxylation by dithiothreitol-iron complex in comparison with adrenodoxin and Se-adrenodoxin. Chem Pharm Bull (Tokyo) 1976; 24:1343-8. [PMID: 1035513 DOI: 10.1248/cpb.24.1343] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
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Nakamura H, Takita T, Umezawa H, Kunishima M, Nakayama Y. Letter: Absolute configuration of coriolin, a sesquiterpene antibiotic from Coriolus consors. J Antibiot (Tokyo) 1974; 27:301-2. [PMID: 4852672 DOI: 10.7164/antibiotics.27.301] [Citation(s) in RCA: 32] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/12/2023]
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Nakayama Y, Kunishima M, Omoto S, Takita T, Umezawa H. Letter: Chemistry of bleomycin. XII. Iso-bleomycin A2, product of carbamoyl group migration. J Antibiot (Tokyo) 1973; 26:400-2. [PMID: 4131337] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
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Sugiura Y, Kunishima M, Tanaka H. Some factors controlling incorporation of labile sulfur into thiol-iron(3) complexes. Biochem Biophys Res Commun 1972; 49:1518-24. [PMID: 4639810 DOI: 10.1016/0006-291x(72)90512-8] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
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