51
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Nishimura R, Shibata T, Tai H, Ishigami I, Ogura T, Nagao S, Matsuo T, Hirota S, Imai K, Neya S, Suzuki A, Yamamoto Y. Relationship between the Electron Density of the Heme Fe Atom and the Vibrational Frequencies of the Fe-Bound Carbon Monoxide in Myoglobin. Inorg Chem 2013; 52:3349-55. [DOI: 10.1021/ic3028447] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Ryu Nishimura
- Department of Chemistry, University of Tsukuba, Tsukuba 305-8571, Japan
| | - Tomokazu Shibata
- Department of Chemistry, University of Tsukuba, Tsukuba 305-8571, Japan
| | - Hulin Tai
- Department of Chemistry, University of Tsukuba, Tsukuba 305-8571, Japan
| | - Izumi Ishigami
- Department of Life Science, Graduate School
of Life Science, University of Hyogo, Kamigori-cho,
Ako-gun, Hyogo 678-1297, Japan
| | - Takashi Ogura
- Department of Life Science, Graduate School
of Life Science, University of Hyogo, Kamigori-cho,
Ako-gun, Hyogo 678-1297, Japan
| | - Satoshi Nagao
- Graduate School of Materials Science, Nara Institute of Science and Technology, Ikoma, Nara 630-0192, Japan
| | - Takashi Matsuo
- Graduate School of Materials Science, Nara Institute of Science and Technology, Ikoma, Nara 630-0192, Japan
| | - Shun Hirota
- Graduate School of Materials Science, Nara Institute of Science and Technology, Ikoma, Nara 630-0192, Japan
| | - Kiyohiro Imai
- Department of Frontier Bioscience,
Faculty of Bioscience and Applied Chemistry, Hosei University, Koganei, Tokyo 184-8584, Japan
| | - Saburo Neya
- Department of Physical Chemistry, Graduate School of Pharmaceutical
Sciences, Chiba University, Chuoh-Inohana,
Chiba 260-8675, Japan
| | - Akihiro Suzuki
- Department
of Materials Engineering, Nagaoka National College of Technology, Nagaoka 940-8532, Japan
| | - Yasuhiko Yamamoto
- Department of Chemistry, University of Tsukuba, Tsukuba 305-8571, Japan
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52
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Onoda A, Hayashi T. Complimenting a Metal Complex with Protein Environment toward a New Hybrid Biocatalyst. J SYN ORG CHEM JPN 2013. [DOI: 10.5059/yukigoseikyokaishi.71.452] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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53
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Oohora K, Onoda A, Hayashi T. Supramolecular assembling systems formed by heme-heme pocket interactions in hemoproteins. Chem Commun (Camb) 2012; 48:11714-26. [PMID: 23079761 DOI: 10.1039/c2cc36376c] [Citation(s) in RCA: 59] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Abstract
A native protein in a biological system spontaneously produces large and elegant assemblies via self-assembly or assembly with various biomolecules which provide non-covalent interactions. In this context, the protein plays a key role in construction of a unique supramolecular structure operating as a functional system. Our group has recently highlighted the structure and function of hemoproteins reconstituted with artificially created heme analogs. The heme molecule is a replaceable cofactor of several hemoproteins. Here, we focus on the successive supramolecular protein assemblies driven by heme-heme pocket interactions to afford various examples of protein fibers, networks and three-dimensional clusters in which an artificial heme moiety is introduced onto the surface of a hemoprotein via covalent linkage and the native heme cofactor is removed from the heme pocket. This strategy is found to be useful for constructing hybrid materials with an electrode or with nanoparticles. The new systems described herein are expected to lead to the generation of various biomaterials with functions and characteristic physicochemical properties similar to those of hemoproteins.
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Affiliation(s)
- Koji Oohora
- Department of Applied Chemistry, Graduate School of Engineering, Osaka University, Yamadaoka 2-1, Suita, Osaka, 565-0871, Japan
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54
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Matsuo T, Komatsuzaki K, Tsuji T, Hayashi T. Reaction of cobalt porphycene with hydride reagents: spectroscopic detection of Co–H porphycene species and formation of Co–SnR3 porphycene species. J PORPHYR PHTHALOCYA 2012. [DOI: 10.1142/s1088424612500587] [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
The reaction of tetrapropylporphycenatocobalt(III) with tributyltin hydride generates a cobalt(III)–hydride porphycene detectable by UV-vis spectroscopy under diluted conditions, whereas it is impossible to characterize hydride species of cobalt porphyrins. One of the reasons for the stability of the porphycene hydride species is that the porphycene ring has a lower LUMO energy level due to the decrease in the symmetry of the ligand character. However, the hydride species in a highly concentrated solution of the complex is easily converted into the cobalt(II) species via dimerization or reaction of the hydride with excess tributyltin hydride through hemolysis of the Sn–H/Co–H bonds. When the Co(III) porphycene is reacted with LiBHEt3 , the final product is the cobalt(III)–ethyl complex formed by β-rearrangement during the reaction of the hydride species and diethylborane in a solvent cage. In the reaction of tetrakistrifluoromethylporphycenatocobalt(III) with tributyltin hydride, the dominant reaction pathway includes one-electron reduction of the porphycene ring together with radical coupling of the tin reagent rather than the net hydride transfer. This finding suggests that the delicate control of the LUMO energy level influences the stability of the hydride species. The tetrapropylporphycenatocobalt(III) complex with tributyltin or triphenyltin hydride in the presence of AIBN produces the corresponding Co(III)– trialkyltin complex. This complex was characterized by 1H NMR spectroscopy.
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Affiliation(s)
- Takashi Matsuo
- Department of Applied Chemistry, Graduate School of Engineering, Osaka University, Suita, Osaka 565-0871, Japan
- Graduate School of Materials Science, Nara Institute of Science and Technology (NAIST), Ikoma, Nara 630-0192, Japan
| | - Kunihiko Komatsuzaki
- Department of Applied Chemistry, Graduate School of Engineering, Osaka University, Suita, Osaka 565-0871, Japan
| | - Takanori Tsuji
- Department of Applied Chemistry, Graduate School of Engineering, Osaka University, Suita, Osaka 565-0871, Japan
| | - Takashi Hayashi
- Department of Applied Chemistry, Graduate School of Engineering, Osaka University, Suita, Osaka 565-0871, Japan
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55
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Okawara T, Abe M, Shimakoshi H, Hisaeda Y. A Pd(II)-hydroxyporphycene: synthesis, characterization, and photoinduced proton-coupled electron transfer. RESEARCH ON CHEMICAL INTERMEDIATES 2012. [DOI: 10.1007/s11164-012-0640-8] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
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56
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Abstract
Unsubstituted porphycene was prepared in 65% yield from 2,7,12,17-tetra-tert-butylporphycene. Taking into account the yield of the substrate, this represents more than a five-fold improvement compared to the methodology used to date. Enhanced availability of the parent porphycene may be exploited in synthetic procedures based on derivatization of the unsubstituted compound.
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Affiliation(s)
- Natalia Urbańska
- Institute of Physical Chemistry, Polish Academy of Sciences, Kasprzaka 44/52, Warsaw, 01-224, Poland
| | - Marek Pietraszkiewicz
- Institute of Physical Chemistry, Polish Academy of Sciences, Kasprzaka 44/52, Warsaw, 01-224, Poland
| | - Jacek Waluk
- Institute of Physical Chemistry, Polish Academy of Sciences, Kasprzaka 44/52, Warsaw, 01-224, Poland
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57
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Matsuo T, Hayashi T. Electron transfer and oxidase activities in reconstituted hemoproteins with chemically modified cofactors. J PORPHYR PHTHALOCYA 2012. [DOI: 10.1142/s1088424609001340] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
Abstract
Protoheme IX is a typical iron porphyrin cofactor, showing a variety of reactivities in many hemoproteins under the reaction environments provided by protein matrices. Chemical modification of the protoheme cofactor is expected to be a versatile strategy to design hemoproteins possessing unique functions. This review focuses on the conversion of a hemoprotein, mainly myoglobin (an oxygen-storage hemoprotein), into a protein having different functions from the original ones by replacement of the protoheme cofactor with synthetic cofactors. The myoglobin having anionic patches pended to the heme propionates effectively binds electron-accepting proteins or small cationic organic molecules on the protein surface, resulting in enhanced efficiency of the photoinduced electron transfers from the myoglobin to these electron acceptors. Furthermore, the peroxidase and peroxygenase activities are also enhanced due to the facile substrate accesses. The attachment of the chemically active moiety such as flavin at the heme terminal is also important to give P450-like function to the native myoglobin. The employment of a structural isomer of porphyrin as an artificial cofactor gives rise to remarkably high dioxygen affinity and peroxidase activity in myoglobin, and allows us to easily detect high-valent species of the porphyrin isomer in HRP. These examples provide a clear insight into hemoprotein modifications based on synthetic chemistry as well as genetic amino acid mutations.
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Affiliation(s)
- Takashi Matsuo
- Department of Applied Chemistry, Graduate School of Engineering, Osaka University, Suita, Osaka 565-0871, Japan
| | - Takashi Hayashi
- Department of Applied Chemistry, Graduate School of Engineering, Osaka University, Suita, Osaka 565-0871, Japan
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58
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Heteroporphyrins. ADVANCES IN HETEROCYCLIC CHEMISTRY 2012. [DOI: 10.1016/b978-0-12-396531-8.00002-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register]
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59
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Okawara T, Abe M, Shimakoshi H, Hisaeda Y. Hydroxy-Functionalized Porphycenes: Structure, Spectroscopy, and Electrochemistry. BULLETIN OF THE CHEMICAL SOCIETY OF JAPAN 2011. [DOI: 10.1246/bcsj.20110072] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
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60
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Takashima H, Kitano M, Hirai C, Murakami H, Tsukahara K. Photophysical and DNA-binding properties of cytochrome c modified with a platinum(II) complex. J Phys Chem B 2011; 114:13889-96. [PMID: 20936831 DOI: 10.1021/jp106121n] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Cytochrome c (cyt c) derivatives modified with a platinum(II) complex at the lysine residue, cyt c(III)-[Pt(bpy)(dapap)](1) {bpy = 2,2'-bipyridine, and dapap = 3-(2,3-diaminopropionylamino)propionic acid}, have been prepared. The modified residues are Lys8, Lys13, Lys55, Lys60, Lys73, and Lys88. In the case of the cyt c(III)-[Pt(bpy)(dapap)](1) dyad, the photoexcited singlet state of (1)([Pt(bpy)(dapap)](1))* was quenched by the heme Fe(III) moiety through the intramolecular photoinduced energy-transfer reaction via a through-space mechanism. Next, in the presence of calf thymus (CT)-DNA, the DNA-responsive fluorescence properties of cyt c(III)-[Pt(bpy)(dapap)](1) isomers were investigated. The order of the obtained binding constants between the cyt c(III)-[Pt(bpy)(dapap)](1) isomer and CT-DNA in an aqueous solution suggested that the electrostatic interaction is one of the important factors to stabilize the cyt c-DNA complex. Finally, we discussed the rotational motion of the [Pt(bpy)(dapap)](2+) moiety at the surface of cyt c by fluorescence anisotropy measurement. The increase in the anisotropy parameter, r, for each cyt c isomer clearly revealed that the noncovalent recognition of the [Pt(bpy)(dapap)](2+) moiety by CT-DNA is an essential event in the formation of the cyt c-DNA complex and generation of DNA-sensitive fluorescence signals.
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Affiliation(s)
- Hiroshi Takashima
- Department of Chemistry, Faculty of Science, Nara Women's University, Nara, 630-8506 Japan.
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61
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Sun Y, Chen K, Jia L, Li H. Toward understanding macrocycle specificity of iron on the dioxygen-binding ability: a theoretical study. Phys Chem Chem Phys 2011; 13:13800-8. [DOI: 10.1039/c0cp02715d] [Citation(s) in RCA: 35] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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62
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Shibata T, Nagao S, Fukaya M, Tai H, Nagatomo S, Morihashi K, Matsuo T, Hirota S, Suzuki A, Imai K, Yamamoto Y. Effect of heme modification on oxygen affinity of myoglobin and equilibrium of the acid-alkaline transition in metmyoglobin. J Am Chem Soc 2010; 132:6091-8. [PMID: 20392104 DOI: 10.1021/ja909891q] [Citation(s) in RCA: 39] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Functional regulation of myoglobin (Mb) is thought to be achieved through the heme environment furnished by nearby amino acid residues, and subtle tuning of the intrinsic heme Fe reactivity. We have performed substitution of strongly electron-withdrawing perfluoromethyl (CF(3)) group(s) as heme side chain(s) of Mb to obtain large alterations of the heme electronic structure in order to elucidate the relationship between the O(2) affinity of Mb and the electronic properties of heme peripheral side chains. We have utilized the equilibrium constant (pK(a)) of the "acid-alkaline transition" in metmyoglobin in order to quantitatively assess the effects of the CF(3) substitutions for the electron density of heme Fe atom (rho(Fe)) of the protein. The pK(a) value of the protein was found to decrease by approximately 1 pH unit upon the introduction of one CF(3) group, and the decrease in the pK(a) value with decreasing the rho(Fe) value was confirmed by density functional theory calculations on some model compounds. The O(2) affinity of Mb was found to correlate well with the pK(a) value in such a manner that the P(50) value, which is the partial pressure of O(2) required to achieve 50% oxygenation, increases by a factor of 2.7 with a decrease of 1 pK(a) unit. Kinetic studies on the proteins revealed that the decrease in O(2) affinity upon the introduction of an electron-withdrawing CF(3) group is due to an increase in the O(2) dissociation rate. Since the introduction of a CF(3) group substitution is thought to prevent further Fe(2+)-O(2) bond polarization and hence formation of a putative Fe(3+)-O(2)(-)-like species of the oxy form of the protein [Maxwell, J. C.; Volpe, J. A.; Barlow, C. H.; Caughey, W. S. Biochem. Biophys. Res. Commun. 1974, 58, 166-171], the O(2) dissociation is expected to be enhanced by the substitution of electron-withdrawing groups as heme side chains. We also found that, in sharp contrast to the case of the O(2) binding to the protein, the CO association and dissociation rates are essentially independent of the rho(Fe) value. As a result, the introduction of electron-withdrawing group(s) enhances the preferential binding of CO to the protein over that of O(2). These findings not only resolve the long-standing issue of the mechanism underlying the subtle tuning of the intrinsic heme Fe reactivity, but also provide new insights into the structure-function relationship of the protein.
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Affiliation(s)
- Tomokazu Shibata
- Department of Chemistry, University of Tsukuba, Tsukuba 305-8571, Japan
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63
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Bröring M, Brégier F, Burghaus O, Kleeberg C. A Biomimetic Copper Corrole - Preparation, Characterization, and Reconstitution with Horse Heart Apomyoglobin. Z Anorg Allg Chem 2010. [DOI: 10.1002/zaac.201000102] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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64
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65
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Jiang D, Li X, Williams R, Patel S, Men L, Wang Y, Zhou F. Ternary complexes of iron, amyloid-beta, and nitrilotriacetic acid: binding affinities, redox properties, and relevance to iron-induced oxidative stress in Alzheimer's disease. Biochemistry 2009; 48:7939-47. [PMID: 19601593 DOI: 10.1021/bi900907a] [Citation(s) in RCA: 82] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Abstract
The interaction of amyloid-beta (Abeta) and redox-active metals, two important biomarkers present in the senile plaques of Alzheimer's disease (AD) brain, has been suggested to enhance the Abeta aggregation or facilitate the generation of reactive oxygen species (ROS). This study investigates the nature of the interaction between the metal-binding domain of Abeta, viz., Abeta(1-16), and the Fe(III) or Fe(II) complex with nitrilotriacetic acid (NTA). Using electrospray ionization mass spectrometry (ESI-MS), the formation of a ternary complex of Abeta(1-16), Fe(III), and NTA with a stoichiometry of 1:1:1 was identified. MS also revealed that the NTA moiety can be detached via collision-induced dissociation. The cumulative dissociation constants of both Abeta-Fe(III)-NTA and Abeta-Fe(II)-NTA complexes were deduced to be 6.3 x 10(-21) and 5.0 x 10(-12) M(2), respectively, via measurement of the fluorescence quenching of the sole tyrosine residue on Abeta upon formation of the complex. The redox properties of these two complexes were investigated by cyclic voltammetry. The redox potential of the Abeta-Fe(III)-NTA complex was found to be 0.03 V versus Ag/AgCl, which is negatively shifted by 0.54 V when compared to the redox potential of free Fe(III)/Fe(II). Despite such a large potential modulation, the redox potential of the Abeta-Fe(III)-NTA complex is still sufficiently high for a range of redox reactions with cellular species to occur. The Abeta-Fe(II)-NTA complex electrogenerated from the Abeta-Fe(III)-NTA complex was also found to catalyze the reduction of oxygen to produce H(2)O(2). These findings provide significant insight into the role of iron and Abeta in the development of AD. The binding of iron by Abeta modulates the redox potential to a level at which its redox cycling occurs. In the presence of a biological reductant (antioxidant), redox cycling of iron could disrupt the redox balance within the cellular milieu. As a consequence, not only is ROS continuously produced, but oxygen and biological reductants can also be depleted. A cascade of biological processes can therefore be affected. In addition, the strong binding affinity of Abeta toward Fe(III) and Fe(II) indicates Abeta could compete for iron against other iron-containing proteins. In particular, its strong affinity for Fe(II), which is 8 orders of magnitude stronger than that of transferrin, would greatly interfere with iron homeostasis.
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Affiliation(s)
- Dianlu Jiang
- Department of Chemistry and Biochemistry, California State University, Los Angeles, California 90032, USA
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66
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Cuesta L, Karnas E, Lynch VM, Chen P, Shen J, Kadish KM, Ohkubo K, Fukuzumi S, Sessler JL. Metalloporphycenes: Synthesis and Characterization of (Pentamethylcyclopentadienyl)ruthenium Sitting-Atop and π-Complexes. J Am Chem Soc 2009; 131:13538-47. [DOI: 10.1021/ja905284d] [Citation(s) in RCA: 58] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Luciano Cuesta
- Department of Chemistry & Biochemistry, University Station-A5300, The University of Texas, Austin, Texas 78712-0165, Department of Chemistry, University of Houston, Houston, Texas 77204-5003, and Department of Material and Life Science, Graduate School of Engineering, Osaka University, SORST, Japan Science and Technology Agency (JST), Suita, Osaka 565-0871, Japan
| | - Elizabeth Karnas
- Department of Chemistry & Biochemistry, University Station-A5300, The University of Texas, Austin, Texas 78712-0165, Department of Chemistry, University of Houston, Houston, Texas 77204-5003, and Department of Material and Life Science, Graduate School of Engineering, Osaka University, SORST, Japan Science and Technology Agency (JST), Suita, Osaka 565-0871, Japan
| | - Vincent M. Lynch
- Department of Chemistry & Biochemistry, University Station-A5300, The University of Texas, Austin, Texas 78712-0165, Department of Chemistry, University of Houston, Houston, Texas 77204-5003, and Department of Material and Life Science, Graduate School of Engineering, Osaka University, SORST, Japan Science and Technology Agency (JST), Suita, Osaka 565-0871, Japan
| | - Ping Chen
- Department of Chemistry & Biochemistry, University Station-A5300, The University of Texas, Austin, Texas 78712-0165, Department of Chemistry, University of Houston, Houston, Texas 77204-5003, and Department of Material and Life Science, Graduate School of Engineering, Osaka University, SORST, Japan Science and Technology Agency (JST), Suita, Osaka 565-0871, Japan
| | - Jing Shen
- Department of Chemistry & Biochemistry, University Station-A5300, The University of Texas, Austin, Texas 78712-0165, Department of Chemistry, University of Houston, Houston, Texas 77204-5003, and Department of Material and Life Science, Graduate School of Engineering, Osaka University, SORST, Japan Science and Technology Agency (JST), Suita, Osaka 565-0871, Japan
| | - Karl M. Kadish
- Department of Chemistry & Biochemistry, University Station-A5300, The University of Texas, Austin, Texas 78712-0165, Department of Chemistry, University of Houston, Houston, Texas 77204-5003, and Department of Material and Life Science, Graduate School of Engineering, Osaka University, SORST, Japan Science and Technology Agency (JST), Suita, Osaka 565-0871, Japan
| | - Kei Ohkubo
- Department of Chemistry & Biochemistry, University Station-A5300, The University of Texas, Austin, Texas 78712-0165, Department of Chemistry, University of Houston, Houston, Texas 77204-5003, and Department of Material and Life Science, Graduate School of Engineering, Osaka University, SORST, Japan Science and Technology Agency (JST), Suita, Osaka 565-0871, Japan
| | - Shunichi Fukuzumi
- Department of Chemistry & Biochemistry, University Station-A5300, The University of Texas, Austin, Texas 78712-0165, Department of Chemistry, University of Houston, Houston, Texas 77204-5003, and Department of Material and Life Science, Graduate School of Engineering, Osaka University, SORST, Japan Science and Technology Agency (JST), Suita, Osaka 565-0871, Japan
| | - Jonathan L. Sessler
- Department of Chemistry & Biochemistry, University Station-A5300, The University of Texas, Austin, Texas 78712-0165, Department of Chemistry, University of Houston, Houston, Texas 77204-5003, and Department of Material and Life Science, Graduate School of Engineering, Osaka University, SORST, Japan Science and Technology Agency (JST), Suita, Osaka 565-0871, Japan
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67
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Takashima H, Kawahara H, Kitano M, Shibata S, Murakami H, Tsukahara K. Metal ion-dependent fluorescent dynamics of photoexcited zinc-porphyrin and zinc-myoglobin modified with ethylenediaminetetraacetic acid. J Phys Chem B 2009; 112:15493-502. [PMID: 18991435 DOI: 10.1021/jp807692w] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The reconstituted zinc-myoglobin (ZnMb) dyads, ZnMb-[M(II)(edta)], have been prepared by incorporating a zinc-porphyrin (ZnP) cofactor modified with ethylenediaminetetraacetic acid (H(4)edta) into apo-Mb. In case of the monomeric ZnP(edta) cofactor coordinated by one pyridine molecule, ZnP(py)(edta), a spontaneous 1:1 complex with a transient metal ion was formed in an aqueous solvent, and the photoexcited singlet state of ZnP, (1)(ZnP)*, was quenched by the [Cu(II)(edta)] moiety through intramolecular photoinduced electron-transfer (ET) reaction. The rate constant for the intramolecular quenching ET (k(q)) at 25 degrees C was successfully obtained as k(q) = 5.1 x 10(9) s(-1). In the case of Co(2+), Ni(2+), and Mn(2+), intersystem crossing by paramagnetic effect was mainly considered between (1)(ZnP)* and the [M(II)(edta)] complex. For the ZnMb-[M(II)(edta)] systems, the intramolecular ET reaction between the excited singlet state of (1)(ZnMb)* and the [Cu(II)(edta)] moieties provided the slower quenching rate constant, k(q) = 2.1 x 10(8) s(-1), compared with that of the ZnP(py)(edta) one. Kinetic studies also presented the efficient fluorescence quenching of the (1)(ZnMb)*-[Co(II)(edta)] dyad. Our study clearly demonstrates that wrapping of the ZnP cofactor by the apoprotein matrix and synthetic manipulation at the Mb surface ensure metal ion-sensitive fluorescent dynamics of ZnMb and provides valuable information to elucidate the complicated mechanism of the biological photoinduced ET reactions of hemoproteins.
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Affiliation(s)
- Hiroshi Takashima
- Department of Chemistry, Faculty of Science, Nara Women's University, Nara, 630-8506 Japan.
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68
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Maeda D, Shimakoshi H, Abe M, Hisaeda Y. Synthesis and photochemical properties of a new molybdenum porphycene complex. Dalton Trans 2009:140-5. [DOI: 10.1039/b809262a] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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69
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Bröring M, Brégier F, Krüger R, Kleeberg C. Functional Porphyrinoids from a Biomimetically Decorated Bipyrrole. Eur J Inorg Chem 2008. [DOI: 10.1002/ejic.200800946] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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70
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Murakami S, Yamamoto KI, Shinmori H, Takeuchi T. A Molecularly Imprinted Polymer for the Reconstruction of a Molecular Recognition Region. CHEM LETT 2008. [DOI: 10.1246/cl.2008.1028] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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71
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Matsuo T, Ito K, Nakashima Y, Hisaeda Y, Hayashi T. Effect of peripheral trifluoromethyl groups in artificial iron porphycene cofactor on ligand binding properties of myoglobin. J Inorg Biochem 2008; 102:166-73. [PMID: 17845820 DOI: 10.1016/j.jinorgbio.2007.07.032] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/20/2007] [Revised: 06/30/2007] [Accepted: 07/27/2007] [Indexed: 11/18/2022]
Abstract
An iron porphycene, a structural isomer of iron porphyrin, with trifluoromethyl groups at the peripheral position of the framework was incorporated into sperm whale apomyoglobin. The prepared myoglobin shows the higher O(2) affinity than the native protein. However, the oxygen affinity of the reconstituted myoglobin is lower than that of the myoglobin having an iron porphycene without trifluoromethyl groups, which is mainly originated from the enhancement of the O(2) dissociation. The CO affinity of the myoglobin with the trifluoromethylated iron porphycene is similar to that observed for the reference protein having the iron porphycene without trifluoromethyl groups, although their C-O stretching frequencies are significantly different. The relationship between the electronic states of the porphycene ring and the ligand bindings is discussed.
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Affiliation(s)
- Takashi Matsuo
- Department of Applied Chemistry, Graduate School of Engineering, Osaka University, Suita, Osaka 565-0871, Japan
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72
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73
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Kano K, Kitagishi H, Sone Y, Nakazawa N, Kodera M. Redox Behavior of a Manganese Porphyrin Complexed with Per-O-methylated β-Cyclodextrin in Aqueous Solution. Eur J Inorg Chem 2006. [DOI: 10.1002/ejic.200600336] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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Matsuo T, Ikegami T, Sato H, Hisaeda Y, Hayashi T. Ligand binding properties of two kinds of reconstituted myoglobins with iron porphycene having propionates: Effect of β-pyrrolic position of two propionate side chains in porphycene framework. J Inorg Biochem 2006; 100:1265-71. [PMID: 16624412 DOI: 10.1016/j.jinorgbio.2006.02.018] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/15/2005] [Revised: 01/31/2006] [Accepted: 02/03/2006] [Indexed: 10/25/2022]
Abstract
An iron porphycene containing two propionate side chains at the 12th and 17th beta-pyrrolic positions of the porphycene ring was synthesized and incorporated into sperm whale apomyoglobin in order to investigate the O(2) and CO binding properties of the reconstituted ferrous myoglobin. The protein showed a slower O(2) dissociation rate by 1/20, compared to the native myoglobin, whereas the CO dissociation rates were found to be almost the same. This tendency is similar to the result of a previous study on the reconstituted myoglobin with a porphycene having the propionates at the 13th and 16th beta-pyrrolic positions. However, the present myoglobin showed a faster O(2) dissociation than the previously studied myoglobin. This finding suggests that the position of the two propionates as well as the symmetry of the porphycene framework is an important factor for obtaining a stable oxygenated iron porphycene myoglobin.
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Affiliation(s)
- Takashi Matsuo
- Division of Applied Chemistry, Graduate School of Engineering, Osaka University, 2-1 Yamadaoka, Suita, Osaka 565-0871, Japan
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75
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Makris TM, von Koenig K, Schlichting I, Sligar SG. The status of high-valent metal oxo complexes in the P450 cytochromes. J Inorg Biochem 2006; 100:507-18. [PMID: 16510191 DOI: 10.1016/j.jinorgbio.2006.01.025] [Citation(s) in RCA: 101] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/19/2005] [Revised: 01/17/2006] [Accepted: 01/17/2006] [Indexed: 11/24/2022]
Abstract
The oxidative prowess of the P450 cytochromes in physiological reactions is attributed to the production of a high-valent iron-oxo complex, or Compound I intermediate, in the reaction cycle. Despite many years of study, however, the full electronic description of this fleeting intermediate still remains an active area of study. In this manuscript, the current status of the isolation and characterization of the P450 oxo-Fe(IV) is examined and compared to analogous states in related heme enzymes. In addition, the utilization of cofactor exchange to stabilize high-valent oxo-states in the P450 is addressed. Structural and spectroscopic studies on manganese reconstituted P450, and its corresponding oxo-complex, are presented.
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Affiliation(s)
- Thomas M Makris
- Department of Biochemistry, University of Illinois Urbana-Champaign, 116 Morrill Hall, Urbana, IL 61801, USA.
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76
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Nakashima H, Hasegawa JY, Nakatsuji H. On the O2 binding of Fe–porphyrin, Fe–porphycene, and Fe–corrphycene complexes. J Comput Chem 2006; 27:1363-72. [PMID: 16788910 DOI: 10.1002/jcc.20447] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Abstract
Based on our previous study for the O2 binding of the Fe-Por complex, this study investigates the O2 binding mechanism in the Fe-porphyrin isomers, Fe-porphycene (FePc), and Fe-corrphycene (FeCor) complexes. By calculating the potential energy surface of the O2 binding, the present study explains the reason for the dramatic increase of O2 affinities observed in the FePc complex. In the case of FeCor-O2, the O2 binding process includes the intersystem crossing from a triplet to singlet state, as in the FePor-O2 complex. However, FePc-O2 uses only a singlet surface. This is because the ground state of the FePc complex in the deoxy state is a triplet state, while those of FePor and FeCor are a quintet state. Such difference originates from character of the SOMO. We estimated an equilibrium constant for the O2 binding that reasonably reproduced the trend observed in the experiments.
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Affiliation(s)
- Hiroyuki Nakashima
- Department of Synthetic Chemistry and Biological Chemistry, Graduate School of Engineering, Kyoto University, Katsura, Nishikyo-ku, Kyoto 615-8510, Japan
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77
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Khoroshun DV, Musaev DG, Morokuma K. Electronic reorganization: Origin of sigma trans promotion effect. J Comput Chem 2006; 28:423-41. [PMID: 17143866 DOI: 10.1002/jcc.20551] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Abstract
Binding of two ligands trans to each other by some transition metal complexes may be cooperative [Khoroshun et al., Mol Phys 2002, 100, 523]. Several interesting consequent effects include (i) inverse relationship between bond strength and binding affinity; (ii) smaller coordination barriers to formation of weaker bonds; (iii) enhancement of Lewis acidity with increased number of ligands. We describe a simple model, sigma trans promotion effect (TPE), which considers electronic reorganization between two Lewis structures, and predicts the above-mentioned effects. The applied result of present study is the unified perspective on several facts of heme chemistry. Particularly, we reiterate an important but often overlooked notion, developed previously within the spin pairing model [Drago and Corden, Acc Chem Res 1980, 13, 353], that, in hemoproteins, the proximal histidine and the distal ligand such as O2 or CO cooperate in promoting electronic reorganization. As a result, depopulation of dz2 orbital upon ligand binding contributes to the phenomenon of hemoglobin cooperativity. The presented density functional (B3LYP) calculations on realistic models, the processes of carbon monoxide binding by Fe(II) porphyrins and dinitrogen binding by triamido/triamidoamine Mo(III) complexes, particularly the evaluation of the coordination barriers due to spin-state change by location of the minima on seams of crossing, support the TPE model predictions. From a broader theoretical perspective, the present study would hopefully stimulate the development of much needed frameworks and tools for facile comparisons of wave functions and their properties between different geometries, species, and electronic states. Advancement of practical wave function comparisons may yield fresh qualitative perspectives on chemical reactivity, and promote better understanding of related concepts such as electronic reorganization.
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Affiliation(s)
- Dmitry V Khoroshun
- Cherry L. Emerson Center for Scientific Computation, Emory University, 1515 Dickey Drive, Atlanta, Georgia 30322, USA
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78
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Nakashima H, Hasegawa JY, Nakatsuji H. On the reversible O2 binding of the Fe–porphyrin complex. J Comput Chem 2006; 27:426-33. [PMID: 16419019 DOI: 10.1002/jcc.20339] [Citation(s) in RCA: 50] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Abstract
Electronic mechanism of the reversible O(2) binding by heme was studied by using Density Functional Theory calculations. The ground state of oxyheme was calculated to be open singlet state [Fe(S =1/2) + O(2)(S = 1/2)]. The potential energy surface for singlet state is associative, while that for triplet state is dissociative. Because the ground state of the O(2)+ deoxyheme system is triplet in the dissociation limit [Fe(S = 2) + O(2)(S = 1)], the O(2) binding process requires relativistic spin-orbit interaction to accomplish the intersystem crossing from triplet to singlet states. Owing to the singlet-triplet crossing, the activation energies for both O(2) binding and dissociation become moderate, and hence reversible. We also found that the deviation of the Fe atom from the porphyrin plane is also important reaction coordinate for O(2) binding. The potential surface is associative/dissociative when the Fe atom locates in-plane/out-of-plane.
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Affiliation(s)
- Hiroyuki Nakashima
- Department of Synthetic Chemistry and Biological Chemistry, Graduate School of Engineering, Kyoto University, Katsura, Kyoto 615-8510, Japan
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79
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Shimakoshi H, Aritome I, Hirota S, Hisaeda Y. Dioxygen Binding to a Cobalt(II) Porphycene Complex and Its Auto-Oxidized Cobalt(III) Complex. BULLETIN OF THE CHEMICAL SOCIETY OF JAPAN 2005. [DOI: 10.1246/bcsj.78.1619] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
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