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Saga Y, Yoshida N, Yamada S, Mizoguchi T, Tamiaki H. Biosynthesis of unnatural glycolipids possessing diyne moiety in the acyl chain in the green sulfur photosynthetic bacterium Chlorobaculum tepidum grown by supplementation of 10,12-heptadecadiynic acid. Biochem Biophys Rep 2017; 9:42-46. [PMID: 28955987 PMCID: PMC5614547 DOI: 10.1016/j.bbrep.2016.11.007] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/26/2016] [Revised: 11/09/2016] [Accepted: 11/12/2016] [Indexed: 12/04/2022] Open
Abstract
Unnatural glycolipids possessing the diyne moiety in their acyl groups were successfully biosynthesized in the green sulfur photosynthetic bacterium Chlorobaculum (Cba.) tepidum by cultivation with supplementation of 10,12-heptadecadiynic acid. Monogalactosyldiacylglycerol (MGDG) and rhamnosylgalactosyldiacylglycerol (RGDG) esterified with one 10,12-heptadecadiynic acid were primarily formed in the cells, and small amounts of glycolipids esterified with the two unnatural fatty acids can also be detected. The relative ratio of these unnatural glycolipids occupied in the total glycolipids was estimated to be 49% based on HPLC analysis using a evaporative light scattering detector. These results indicate that the acyl groups in glycolipids, which play important roles in the formation of extramembranous antenna complexes called chlorosomes, can be modified in vivo by cultivation of green sulfur photosynthetic bacteria with exogenous synthetic fatty acids. Visible absorption and circular dichroism spectra of Cba. tepidum containing the unnatural glycolipids demonstrated the formation of chlorosomes, indicating that the unnatural glycolipids in this study did not interfere with the biogenesis of chlorosomes. Novel glycolipids possessing a diyne moiety in the acyl chain were biosynthesized. Supplemental fatty acids were used in the biosynthesis of glycolipids in the photosynthetic bacterium. The novel glycolipids did not inhibit the formation of photosynthetic antenna complexes.
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Affiliation(s)
- Yoshitaka Saga
- Department of Chemistry, Faculty of Science and Engineering, Kindai University, Higashi-Osaka, Osaka 577-8502, Japan.,PRESTO, Japan Science and Technology Agency, Kawaguchi, Saitama 332-0012, Japan
| | - Nozomi Yoshida
- Department of Chemistry, Faculty of Science and Engineering, Kindai University, Higashi-Osaka, Osaka 577-8502, Japan
| | - Shota Yamada
- Department of Chemistry, Faculty of Science and Engineering, Kindai University, Higashi-Osaka, Osaka 577-8502, Japan
| | - Tadashi Mizoguchi
- Graduate School of Life Sciences, Ritsumeikan University, Kusatsu, Shiga 525-8577, Japan
| | - Hitoshi Tamiaki
- Graduate School of Life Sciences, Ritsumeikan University, Kusatsu, Shiga 525-8577, Japan
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Saga Y, Yamashita H, Hirota K. Introduction of perfluoroalkyl chain into the esterifying moiety of bacteriochlorophyll c in the green sulfur photosynthetic bacterium Chlorobaculum tepidum by pigment biosynthesis. Bioorg Med Chem 2016; 24:4165-4170. [PMID: 27427396 DOI: 10.1016/j.bmc.2016.07.004] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/11/2016] [Revised: 07/02/2016] [Accepted: 07/04/2016] [Indexed: 11/27/2022]
Abstract
The green sulfur photosynthetic bacterium Chlorobaculum (Cba.) tepidum was grown in liquid cultures containing perfluoro-1-decanol, 1H,1H,2H,2H-heptadecafluoro-1-decanol [CF3(CF2)7(CH2)2OH] or 1H,1H-nonadecafluoro-1-decanol [CF3(CF2)8CH2OH], to introduce rigid and fluorophilic chains into the esterifying moiety of light-harvesting bacteriochlorophyll (BChl) c. Exogenous 1H,1H,2H,2H-heptadecafluoro-1-decanol was successfully attached to the 17(2)-carboxy group of bacteriochlorophyllide (BChlide) c in vivo: the relative ratio of the unnatural BChl c esterified with this perfluoroalcohol over the total BChl c was 10.3%. Heat treatment of the liquid medium containing 1H,1H,2H,2H-heptadecafluoro-1-decanol with β-cyclodextrin before inoculation increased the relative ratio of the BChl c derivative esterified with this alcohol in the total BChl c in Cba. tepidum. In a while, 1H,1H-nonadecafluoro-1-decanol was not attached to BChlide c in Cba. tepidum, which was grown by its supplementation. These results suggest that the rigidity close to the hydroxy group of the esterifying alcohol is not suitable for the recognition by the BChl c synthase called BchK in Cba. tepidum. The unnatural BChl c esterified with 1H,1H,2H,2H-heptadecafluoro-1-decanol participated in BChl c self-aggregates in chlorosomes.
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Affiliation(s)
- Yoshitaka Saga
- Department of Chemistry, Faculty of Science and Engineering, Kindai University, Higashi-Osaka, Osaka 577-8502, Japan; PRESTO, Japan Science and Technology Agency, Kawaguchi, Saitama 332-0012, Japan.
| | - Hayato Yamashita
- Department of Chemistry, Faculty of Science and Engineering, Kindai University, Higashi-Osaka, Osaka 577-8502, Japan
| | - Keiya Hirota
- Department of Chemistry, Faculty of Science and Engineering, Kindai University, Higashi-Osaka, Osaka 577-8502, Japan
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Saga Y, Hayashi K, Hirota K, Harada J, Tamiaki H. Modification of the esterifying farnesyl chain in light-harvesting bacteriochlorophylls in green sulfur photosynthetic bacteria by supplementation of 9-decyn-1-ol, 9-decen-1-ol, and decan-1-ol. J Photochem Photobiol A Chem 2015. [DOI: 10.1016/j.jphotochem.2015.05.002] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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Saga Y, Hirota K, Harada J, Tamiaki H. In Vitro Enzymatic Activities of Bacteriochlorophyll a Synthase Derived from the Green Sulfur Photosynthetic Bacterium Chlorobaculum tepidum. Biochemistry 2015; 54:4998-5005. [PMID: 26258685 DOI: 10.1021/acs.biochem.5b00311] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The activity of an enzyme encoded by the CT1610 gene in the green sulfur photosynthetic bacterium Chlorobaculum tepidum, which was annotated as bacteriochlorophyll (BChl) a synthase, BchG (denoted as tepBchG), was examined in vitro using the lysates of Escherichia coli containing the heterologously expressed enzyme. BChl a possessing a geranylgeranyl group at the 17-propionate residue (BChl aGG) was produced from bacteriochlorophyllide (BChlide) a and geranylgeranyl pyrophosphate in the presence of tepBchG. Surprisingly, tepBchG catalyzed the formation of BChl a bearing a farnesyl group (BChl aF) as in the enzymatic production of BChl aGG, indicating loose recognition of isoprenoid pyrophosphates in tepBchG. In contrast to such loose recognition of isoprenoid substrates, BChlide c and chlorophyllide a gave no esterifying product upon being incubated with geranylgeranyl or farnesyl pyrophosphate in the presence of tepBchG. These results confirm that tepBchG undoubtedly acts as the BChl a synthase in Cba. tepidum. The enzymatic activity of tepBchG was higher than that of BchG of Rhodobacter sphaeroides at 45 °C, although the former activity was lower than the latter below 35 °C.
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Affiliation(s)
- Yoshitaka Saga
- †Department of Chemistry, Faculty of Science and Engineering, Kinki University, Higashi-Osaka, Osaka 577-8502, Japan.,‡PRESTO, Japan Science and Technology Agency, Kawaguchi, Saitama 332-0012, Japan
| | - Keiya Hirota
- †Department of Chemistry, Faculty of Science and Engineering, Kinki University, Higashi-Osaka, Osaka 577-8502, Japan
| | - Jiro Harada
- §Department of Medical Biochemistry, Kurume University School of Medicine, Kurume, Fukuoka 830-0011, Japan
| | - Hitoshi Tamiaki
- ∥Graduate School of Life Sciences, Ritsumeikan University, Kusatsu, Shiga 525-8577, Japan
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Nishimori R, Tamiaki H, Kashimura S, Saga Y. In vitro self-assembly of bacteriochlorophyll c derivatives monoesterified with α,ω-diols isolated from the green sulfur photosynthetic bacterium Chlorobaculum tepidum. Supramol Chem 2014. [DOI: 10.1080/10610278.2014.904515] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
Affiliation(s)
- Risato Nishimori
- Department of Chemistry, Faculty of Science and Engineering, Kinki University, Higashi-Osaka, Osaka 577-8502, Japan
| | - Hitoshi Tamiaki
- Graduate School of Life Sciences, Ritsumeikan University, Kusatsu, Shiga 525-8577, Japan
| | - Shigenori Kashimura
- Department of Chemistry, Faculty of Science and Engineering, Kinki University, Higashi-Osaka, Osaka 577-8502, Japan
| | - Yoshitaka Saga
- Department of Chemistry, Faculty of Science and Engineering, Kinki University, Higashi-Osaka, Osaka 577-8502, Japan
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Saga Y, Hayashi K, Mizoguchi T, Tamiaki H. Biosynthesis of bacteriochlorophyll c derivatives possessing chlorine and bromine atoms at the terminus of esterifying chains in the green sulfur bacterium Chlorobaculum tepidum. J Biosci Bioeng 2014; 118:82-7. [PMID: 24495924 DOI: 10.1016/j.jbiosc.2013.12.023] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/11/2013] [Revised: 12/26/2013] [Accepted: 12/27/2013] [Indexed: 11/26/2022]
Abstract
The green sulfur photosynthetic bacterium Chlorobaculum tepidum newly produced BChl c derivatives possessing a chlorine or bromine atom at the terminus of the esterifying chain in the 17-propionate residue by cultivation with exogenous ω-halo-1-alkanols. The relative ratios of BChl c derivatives esterified with 8-chloro-1-octanol and 10-chloro-1-decanol were estimated to be 26.5% and 33.3% by cultivation with these ω-chloro-1-alkanols at the final concentrations of 300 and 150 μM, respectively. In contrast, smaller amounts of unnatural BChls c esterified with ω-bromo-1-alkanols were biosynthesized than those esterified with ω-chloro-1-alkanols: the ratios of BChl c derivatives esterified with 8-bromo-1-octanol and 10-bromo-1-decanol were 11.3% and 12.2% at the concentrations of 300 and 150 μM, respectively. These indicate that ω-chloro-1-alkanols can be incorporated into bacteriochlorophyllide c more than ω-bromo-1-alkanols in the BChl c biosynthetic pathway. The homolog compositions of the novel BChl c derivatives possessing a halogen atom were analogous to those of coexisting natural BChl c esterified with farnesol. These results demonstrate unique properties of BChl c synthase, BchK, which can utilize unnatural substrates containing halogen in the BChl c biosynthesis of Cba. tepidum.
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Affiliation(s)
- Yoshitaka Saga
- Department of Chemistry, Faculty of Science and Engineering, Kinki University, Higashi-Osaka, Osaka 577-8502, Japan.
| | - Keisuke Hayashi
- Department of Chemistry, Faculty of Science and Engineering, Kinki University, Higashi-Osaka, Osaka 577-8502, Japan
| | - Tadashi Mizoguchi
- Graduate School of Life Sciences, Ritsumeikan University, Kusatsu, Shiga 525-8577, Japan
| | - Hitoshi Tamiaki
- Graduate School of Life Sciences, Ritsumeikan University, Kusatsu, Shiga 525-8577, Japan
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Saga Y, Saiki T, Takahashi N, Shibata Y, Tamiaki H. Scrambled Self-Assembly of Bacteriochlorophyllscandein Aqueous Triton X-100 Micelles. Photochem Photobiol 2013; 90:552-9. [DOI: 10.1111/php.12219] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/14/2013] [Accepted: 11/28/2013] [Indexed: 01/13/2023]
Affiliation(s)
- Yoshitaka Saga
- Department of Chemistry; Faculty of Science and Engineering; Kinki University; Higashi-Osaka Japan
| | - Tatsuya Saiki
- Department of Chemistry; Faculty of Science and Engineering; Kinki University; Higashi-Osaka Japan
| | - Naoya Takahashi
- Department of Chemistry; Faculty of Science and Engineering; Kinki University; Higashi-Osaka Japan
| | - Yutaka Shibata
- Department of Chemistry; Graduate School of Science; Tohoku University; Sendai Japan
| | - Hitoshi Tamiaki
- Graduate School of Life Sciences; Ritsumeikan University; Kusatsu Japan
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Sadaoka K, Oba T, Tamiaki H, Kashimura S, Saga Y. Demetalation kinetics of the zinc chlorophyll derivative possessing two formyl groups: effects of formyl groups conjugated to the chlorin macrocycle on physicochemical properties of photosynthetic pigments. J PORPHYR PHTHALOCYA 2013. [DOI: 10.1142/s1088424613500788] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
Abstract
Demetalation kinetics of zinc chlorophyll derivative 1 possessing two formyl groups directly linked to the A- and B-rings of the chlorin macrocycle, which was synthesized from chlorophyll b, was examined under acidic conditions and compared with those of Zn chlorins 2 and 3 possessing a single formyl group in the A- and B-ring, respectively, as well as Zn chlorin 4 lacking any formyl group to unravel the substitution effects on demetalation properties of chlorophyllous pigments. Demetalation kinetics of diformylated Zn chlorin 1 was slower than those of monoformylated Zn chlorins 2 and 3, indicating that the effect of the electron-withdrawing formyl group on demetalation kinetics was amplified by introduction of two formyl groups to the chlorin macrocycle. High correlations were observed between demetalation rate constants of Zn chlorins 1–4 and the sum of Hammett σ parameters of the 3- and 7-substituents on the chlorin macrocycle, indicating that the combination of electron-withdrawing abilities of the substituents linked directly to the cyclic tetrapyrrole was responsible for demetalation properties of zinc chlorophyll derivatives.
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Affiliation(s)
- Kana Sadaoka
- Department of Chemistry, Faculty of Science and Engineering, Kinki University, Higashi-Osaka, Osaka 577-8502, Japan
| | - Toru Oba
- Department of Material and Environmental Chemistry, Graduate School of Engineering, Utsunomiya University, Utsunomiya, Tochigi 321-8585, Japan
| | - Hitoshi Tamiaki
- Graduate School of Life Sciences, Ritsumeikan University, Kusatsu, Shiga 525-8577, Japan
| | - Shigenori Kashimura
- Department of Chemistry, Faculty of Science and Engineering, Kinki University, Higashi-Osaka, Osaka 577-8502, Japan
| | - Yoshitaka Saga
- Department of Chemistry, Faculty of Science and Engineering, Kinki University, Higashi-Osaka, Osaka 577-8502, Japan
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Cyclopropane-ring formation in the acyl groups of chlorosome glycolipids is crucial for acid resistance of green bacterial antenna systems. Bioorg Med Chem 2013; 21:3689-94. [DOI: 10.1016/j.bmc.2013.04.030] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/11/2013] [Revised: 04/15/2013] [Accepted: 04/16/2013] [Indexed: 11/21/2022]
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Saga Y, Maruko A, Sadaoka K, Takahashi N. Effects of the 13-Keto Group in the E-Ring of Zinc Chlorophyll Derivatives on Demetalation Kinetics under Acidic Conditions. CHEM LETT 2013. [DOI: 10.1246/cl.130205] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
- Yoshitaka Saga
- Department of Chemistry, Faculty of Science and Engineering, Kinki University
| | - Akane Maruko
- Department of Chemistry, Faculty of Science and Engineering, Kinki University
| | - Kana Sadaoka
- Department of Chemistry, Faculty of Science and Engineering, Kinki University
| | - Naoya Takahashi
- Department of Chemistry, Faculty of Science and Engineering, Kinki University
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Saga Y, Kobashiri Y, Sadaoka K. Systematic Analysis of the Demetalation Kinetics of Zinc Chlorophyll Derivatives Possessing Different Substituents at the 3-Position: Effects of the Electron-Withdrawing and Electron-Donating Strength of Peripheral Substituents. Inorg Chem 2012; 52:204-10. [DOI: 10.1021/ic3016782] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Yoshitaka Saga
- Department of Chemistry, Faculty
of Science and Engineering, Kinki University, Higashi-Osaka, Osaka 577-8502, Japan
| | - Yuta Kobashiri
- Department of Chemistry, Faculty
of Science and Engineering, Kinki University, Higashi-Osaka, Osaka 577-8502, Japan
| | - Kana Sadaoka
- Department of Chemistry, Faculty
of Science and Engineering, Kinki University, Higashi-Osaka, Osaka 577-8502, Japan
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Saga Y, Hirai Y, Sadaoka K, Isaji M, Tamiaki H. Structure-Dependent Demetalation Kinetics of ChlorophyllaAnalogs under Acidic Conditions. Photochem Photobiol 2012; 89:68-73. [DOI: 10.1111/j.1751-1097.2012.01213.x] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/22/2012] [Accepted: 07/19/2012] [Indexed: 11/26/2022]
Affiliation(s)
- Yoshitaka Saga
- Department of Chemistry; Faculty of Science and Engineering; Kinki University; Higashi-Osaka; Osaka; Japan
| | - Yuki Hirai
- Department of Chemistry; Faculty of Science and Engineering; Kinki University; Higashi-Osaka; Osaka; Japan
| | - Kana Sadaoka
- Department of Chemistry; Faculty of Science and Engineering; Kinki University; Higashi-Osaka; Osaka; Japan
| | - Megumi Isaji
- Department of Bioscience and Biotechnology; Faculty of Science and Engineering; Ritsumeikan University; Kusatsu; Shiga; Japan
| | - Hitoshi Tamiaki
- Department of Bioscience and Biotechnology; Faculty of Science and Engineering; Ritsumeikan University; Kusatsu; Shiga; Japan
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Saga Y, Miura R, Sadaoka K, Hirai Y. Kinetic Analysis of Demetalation of Synthetic Zinc Cyclic Tetrapyrroles Possessing an Acetyl Group at the 3-Position: Effects of Tetrapyrrole Structures and Peripheral Substitution. J Phys Chem B 2011; 115:11757-62. [DOI: 10.1021/jp206534x] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Yoshitaka Saga
- Department of Chemistry, Faculty of Science and Engineering, Kinki University, Higashi-Osaka, Osaka 577-8502, Japan
| | - Ryosuke Miura
- Department of Chemistry, Faculty of Science and Engineering, Kinki University, Higashi-Osaka, Osaka 577-8502, Japan
| | - Kana Sadaoka
- Department of Chemistry, Faculty of Science and Engineering, Kinki University, Higashi-Osaka, Osaka 577-8502, Japan
| | - Yuki Hirai
- Department of Chemistry, Faculty of Science and Engineering, Kinki University, Higashi-Osaka, Osaka 577-8502, Japan
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Nishimori R, Mizoguchi T, Tamiaki H, Kashimura S, Saga Y. Biosynthesis of Unnatural Bacteriochlorophyll c Derivatives Esterified with α,ω-Diols in the Green Sulfur Photosynthetic Bacterium Chlorobaculum tepidum. Biochemistry 2011; 50:7756-64. [DOI: 10.1021/bi200994h] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Risato Nishimori
- Department of Chemistry, Faculty
of Science and Engineering, Kinki University, Higashi-Osaka, Osaka 577-8502, Japan
| | - Tadashi Mizoguchi
- Department of Bioscience and
Biotechnology, Faculty of Science and Engineering, Ritsumeikan University, Kusatsu, Shiga 525-8577, Japan
| | - Hitoshi Tamiaki
- Department of Bioscience and
Biotechnology, Faculty of Science and Engineering, Ritsumeikan University, Kusatsu, Shiga 525-8577, Japan
| | - Shigenori Kashimura
- Department of Chemistry, Faculty
of Science and Engineering, Kinki University, Higashi-Osaka, Osaka 577-8502, Japan
| | - Yoshitaka Saga
- Department of Chemistry, Faculty
of Science and Engineering, Kinki University, Higashi-Osaka, Osaka 577-8502, Japan
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Hirai Y, Sasaki SI, Tamiaki H, Kashimura S, Saga Y. Substitution Effects in the A- and B-Rings of the Chlorin Macrocycle on Demetalation Properties of Zinc Chlorophyll Derivatives. J Phys Chem B 2011; 115:3240-4. [DOI: 10.1021/jp1117486] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Yuki Hirai
- Department of Chemistry, Faculty of Science and Engineering, Kinki University, Higashi-Osaka, Osaka 577-8502, Japan
| | - Shin-ichi Sasaki
- Department of Bioscience and Biotechnology, Faculty of Science and Engineering, Ritsumeikan University, Kusatsu, Shiga 525-8577, Japan
- Nagahama Institute of Bio-Science and Technology, Nagahama, Shiga 526-0829, Japan
| | - Hitoshi Tamiaki
- Department of Bioscience and Biotechnology, Faculty of Science and Engineering, Ritsumeikan University, Kusatsu, Shiga 525-8577, Japan
| | - Shigenori Kashimura
- Department of Chemistry, Faculty of Science and Engineering, Kinki University, Higashi-Osaka, Osaka 577-8502, Japan
| | - Yoshitaka Saga
- Department of Chemistry, Faculty of Science and Engineering, Kinki University, Higashi-Osaka, Osaka 577-8502, Japan
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Hirai Y, Kashimura S, Saga Y. Demetalation Kinetics of Chlorophyll Derivatives Possessing Different Substituents at the 7-Position Under Acidic Conditions. Photochem Photobiol 2011; 87:302-7. [DOI: 10.1111/j.1751-1097.2010.00874.x] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
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Saga Y, Hojo S, Hirai Y. Comparison of demetalation properties between zinc chlorin and zinc porphyrin derivatives: Effect of macrocyclic structures. Bioorg Med Chem 2010; 18:5697-700. [DOI: 10.1016/j.bmc.2010.06.019] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/20/2010] [Revised: 06/04/2010] [Accepted: 06/05/2010] [Indexed: 11/28/2022]
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Sadaoka K, Hirai Y, Kashimura S, Saga Y. Kinetic Analysis of Reduction of Formyl Groups in Chlorophylldand Pheophytind. CHEM LETT 2010. [DOI: 10.1246/cl.2010.567] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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Hirai Y, Tamiaki H, Kashimura S, Saga Y. Demetalation kinetics of natural chlorophylls purified from oxygenic photosynthetic organisms: effect of the formyl groups conjugated directly to the chlorin π-macrocycle. Photochem Photobiol Sci 2009; 8:1701-7. [DOI: 10.1039/b9pp00018f] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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