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Kumazawa S, Rodriguez Castanon J, Onishi N, Kuwata K, Shiotsuki M, Sanda F. Characterization of the Polymerization Catalyst [(2,5-norbornadiene)Rh{C(Ph)═CPh2}(PPh3)] and Identification of the End Structures of Poly(phenylacetylenes) Obtained by Polymerization Using This Catalyst. Organometallics 2012. [DOI: 10.1021/om300642b] [Citation(s) in RCA: 35] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
Affiliation(s)
| | | | | | | | - Masashi Shiotsuki
- Molecular Engineering Institute, Kinki University, Kayanomori, Iizuka, Fukuoka 820-8555, Japan
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Lou M, Gilpin ME, Burger SK, Malik AM, Gawuga V, Popović V, Capretta A, Berti PJ. Transition state analysis of acid-catalyzed hydrolysis of an enol ether, enolpyruvylshikimate 3-phosphate (EPSP). J Am Chem Soc 2012; 134:12947-57. [PMID: 22765168 DOI: 10.1021/ja3043382] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Proton transfer to carbon represents a significant catalytic challenge because of the large intrinsic energetic barrier and the frequently unfavorable thermodynamics. Multiple kinetic isotope effects (KIEs) were measured for acid-catalyzed hydrolysis of the enol ether functionality of enolpyruvylshikimate 3-phosphate (EPSP) as a nonenzymatic analog of the EPSP synthase (AroA) reaction. The large solvent deuterium KIE demonstrated that protonating C3 was the rate-limiting step, and the lack of solvent hydron exchange into EPSP demonstrated that protonation was irreversible. The reaction mechanism was stepwise, with C3, the methylene carbon, being protonated to form a discrete oxacarbenium ion intermediate before water attack at the cationic center, that is, an AH(‡)*AN (or AH(‡) + AN) mechanism. The calculated 3-(14)C and 3,3-(2)H2 KIEs varied as a function of the extent of proton transfer at the transition state, as reflected in the C3-H(+) bond order, nC3-H+. The calculated 3-(14)C KIE was a function primarily of C3 coupling with the movement of the transferring proton, as reflected in the reaction coordinate contribution ((light)ν(‡)/(heavy)ν(‡)), rather than of changes in bonding. Coupling was strongest in early and late transition states, where the reaction coordinate frequency was lower. The other calculated (14)C and (18)O KIEs were more sensitive to interactions with counterions and solvation in the model structures than nC3-H+. The KIEs revealed a moderately late transition state with significant oxacarbenium ion character and with a C3-H(+) bond order ≈0.6.
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Affiliation(s)
- Meiyan Lou
- Department of Chemistry & Chemical Biology, and †Department of Biochemistry & Biomedical Sciences, McMaster University , 1280 Main Street West, Hamilton, Ontario L8S 4M1, Canada
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Lou M, Burger SK, Gilpin ME, Gawuga V, Capretta A, Berti PJ. Transition State Analysis of Enolpyruvylshikimate 3-Phosphate (EPSP) Synthase (AroA)-Catalyzed EPSP Hydrolysis. J Am Chem Soc 2012; 134:12958-69. [PMID: 22765279 DOI: 10.1021/ja304339h] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Meiyan Lou
- Department of Chemistry & Chemical Biology, and †Department of Biochemistry & Biomedical Sciences, McMaster University, 1280 Main Street West, Hamilton, Ontario L8S 4M1, Canada
| | - Steven K. Burger
- Department of Chemistry & Chemical Biology, and †Department of Biochemistry & Biomedical Sciences, McMaster University, 1280 Main Street West, Hamilton, Ontario L8S 4M1, Canada
| | - Meghann E. Gilpin
- Department of Chemistry & Chemical Biology, and †Department of Biochemistry & Biomedical Sciences, McMaster University, 1280 Main Street West, Hamilton, Ontario L8S 4M1, Canada
| | - Vivian Gawuga
- Department of Chemistry & Chemical Biology, and †Department of Biochemistry & Biomedical Sciences, McMaster University, 1280 Main Street West, Hamilton, Ontario L8S 4M1, Canada
| | - Alfredo Capretta
- Department of Chemistry & Chemical Biology, and †Department of Biochemistry & Biomedical Sciences, McMaster University, 1280 Main Street West, Hamilton, Ontario L8S 4M1, Canada
| | - Paul J. Berti
- Department of Chemistry & Chemical Biology, and †Department of Biochemistry & Biomedical Sciences, McMaster University, 1280 Main Street West, Hamilton, Ontario L8S 4M1, Canada
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Ko JH, Jin B, Lee M, Bae CH, Song R, Jung MJ, Kim SK. Time-dependent binding mode of a cationic porphyrin dimer to poly[d(G-C)2] and Poly[d(A-T)2]. J Phys Chem B 2008; 112:1502-7. [PMID: 18197658 DOI: 10.1021/jp0772373] [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
The time-dependent binding mode of a porphyrin dimer to poly[d(G-C)2] and poly[d(A-T)2] was investigated by spectroscopic methods including absorption and circular and linear dichroism (CD and LD) spectroscopy. Immediately after mixing with poly[d(G-C)2], the porphyrin dimer exhibited red-shift and hypochromism in the absorption spectrum and negative CD and LD spectra. With further red-shift in absorption, the CD and LD magnitude in the Soret region became increasingly negative over time. After it was stabilized, the magnitude of the reduced LD (LDr) in the Soret region was larger than that in the DNA absorption region, indicating that the second porphyrin was also intercalated. Following the rapid intercalation of the first porphyrin, the very slow intercalation of the second followed with first-order kinetics. In the poly[d(A-T)2] case, a bisignate CD spectrum was observed in the Soret region suggesting stacking of the porphyrins. The small alteration in the CD spectrum and increased absorbance, which followed the initial rapid spectral change, was of the second order. This alteration in the spectral properties was attributed to the conformational change of poly[d(A-T)2] near the binding site because the overall shape of the CD spectrum was conserved in spite of the changes in the absorption spectrum.
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Affiliation(s)
- Jae Hong Ko
- Department of Chemistry, Yeungnam University, Dae-dong, Gyeongsan City, Gyeong-buk 712-749, Republic of Korea
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Morii N, Kido G, Konakahara T, Morii H. Molecular Orientation of Porphyrins Accompanying the Formation of Chain-Aligned DNA Films. Biomacromolecules 2005; 6:3259-66. [PMID: 16283754 DOI: 10.1021/bm050302z] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Porphyrin-containing DNA solid films with several binding orientations were successfully prepared by drying the aqueous solution of porphyrins and DNA in a magnetic field. By the measurement of linear dichroism absorption spectra from three identical spatial directions, the molecular orientations of porphyrins in chain-aligned DNA films were evaluated. Tetra(N-methylpyridinium-4-yl)-porphyrin was found to be bound at the surface of DNA chains like a patch. This orientation is different from the intercalative or groove binding manners observed in solutions. In contrast, tetra(4-sulfonatophenyl)-porphyrin exhibited an orientation perpendicular to the DNA axis, which may be attributed to H-aggregation of porphyrins along the direction parallel to DNA chains. Heme-protein with coiled coil backbone was also aligned along the DNA chains, orienting ferric protoporphyrin parallel to the magnetic field. The major effect for these molecular orientations would be the molecular packing of the rod-disk or the rod-rod systems.
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Affiliation(s)
- Nahoko Morii
- National Institute for Materials Science (NIMS), Tsukuba, Ibaraki 305-0003, Japan.
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Jin B, Lee HM, Lee YA, Ko JH, Kim C, Kim SK. Simultaneous binding of meso-tetrakis(N-methylpyridinium-4-yl)porphyrin and 4',6-diamidino-2-phenylindole at the minor grooves of poly(dA).poly(dT) and poly[d(A-T)(2)]: fluorescence resonance energy transfer between DNA bound drugs. J Am Chem Soc 2005; 127:2417-24. [PMID: 15724996 DOI: 10.1021/ja044555w] [Citation(s) in RCA: 36] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The spectral properties of meso-tetrakis(N-methylpyridinium-4-yl)porphyrin (TMPyP) bound to poly(dA).poly(dT) and poly[d(A-T)(2)] in the presence and in the absence of 4',6-diamidino-2-phenylindole (DAPI) have been studied. DAPI fits deeply into the minor groove of both poly(dA).poly(dT) and poly[d(A-T)(2)], and TMPyP is also situated at the minor groove. The nature of the absorption, circular dichroism (CD), and flow linear dichroism (LD) spectra of the TMPyP-poly(dA).poly(dT) and -poly[d(A-T)(2)] complexes in the Soret band is essentially unaffected whether the minor groove is blocked by DAPI or not, although small variations been noticed in the presence of DAPI. Furthermore, a close analysis of the reduced LD spectrum in the Soret band results in angles of approximately 80 degrees and 55 degrees between transition moments of the TMPyP and DNA helix axes in the absence of DAPI. All these observations indicate that the side of TMPyP whose structure resembles that of classical minor groove binding drugs does not fit deeply into the minor groove. This suggests that TMPyP binds across the minor groove: two positively charged pyridiniumyl rings interact electrostatically with negatively charged phosphate groups of DNA. When DAPI and TMPyP are simultaneously bound to poly(dA).poly(dT) or poly[d(A-T)(2)], the fluorescence intensity of DAPI decreases as TMPyP concentration increases, indicating that the excited energy of DAPI is transferred to TMPyP.
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Affiliation(s)
- Biao Jin
- Department of Chemistry, Yeungnam University, 214-1 Dae-dong, Kyoungsan City, Kyoung-buk, 712-749, Republic of Korea
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Park T, Shin JS, Han SW, Son JK, Kim SK. Stacking of meso-Tetrakis(3-N-methylpyridiniumyl)porphyrin on Poly[d(A-T)2]: Importance of the Distance between Porphyrin's Positive Charges. J Phys Chem B 2004. [DOI: 10.1021/jp0473117] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
Affiliation(s)
- Taegi Park
- Department of Chemistry and College of Pharmacy, Yeungnam University, Dae-dong, Kyoungsan City, Kyoung-buk 712-749, and Department of Environmental Engineering, Kyoungwoon University, Sangdong-myun, Kumi, Kyoung-buk 136-701, Republic of Korea
| | - Jong Sub Shin
- Department of Chemistry and College of Pharmacy, Yeungnam University, Dae-dong, Kyoungsan City, Kyoung-buk 712-749, and Department of Environmental Engineering, Kyoungwoon University, Sangdong-myun, Kumi, Kyoung-buk 136-701, Republic of Korea
| | - Sung Wook Han
- Department of Chemistry and College of Pharmacy, Yeungnam University, Dae-dong, Kyoungsan City, Kyoung-buk 712-749, and Department of Environmental Engineering, Kyoungwoon University, Sangdong-myun, Kumi, Kyoung-buk 136-701, Republic of Korea
| | - Jong-Keun Son
- Department of Chemistry and College of Pharmacy, Yeungnam University, Dae-dong, Kyoungsan City, Kyoung-buk 712-749, and Department of Environmental Engineering, Kyoungwoon University, Sangdong-myun, Kumi, Kyoung-buk 136-701, Republic of Korea
| | - Seog K. Kim
- Department of Chemistry and College of Pharmacy, Yeungnam University, Dae-dong, Kyoungsan City, Kyoung-buk 712-749, and Department of Environmental Engineering, Kyoungwoon University, Sangdong-myun, Kumi, Kyoung-buk 136-701, Republic of Korea
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Rapid methylation on carbon frameworks leading to the synthesis of a PET tracer capable of imaging a novel CNS-type prostacyclin receptor in living human brain. Trends Analyt Chem 2004. [DOI: 10.1016/j.trac.2004.06.003] [Citation(s) in RCA: 31] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/02/2023]
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9
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Lee YA, Kim JO, Cho TS, Song R, Kim SK. Binding of meso-tetrakis(N-methylpyridium-4-yl)porphyrin to triplex oligonucleotides: evidence for the porphyrin stacking in the major groove. J Am Chem Soc 2003; 125:8106-7. [PMID: 12837072 DOI: 10.1021/ja034499j] [Citation(s) in RCA: 51] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Induced CD spectra of meso-tetrakis(N-methylpyridium-4-yl)porphyrin (TMPyP) complexed with d(A)12.d(T)12, d(G)12.d(C)12 duplex and d(A)12.[d(T)12]2, d(G)12.d(C)12.d(C)12+ triplex in the Soret band were compared in this study. When TMPyP is complexed with the duplex, a monomeric CD spectrum at a low [TMPyP]/[oligomer] ratio was apparent, while at a high mixing ratio, the excitonic CD was dominant. In contrast, when TMPyP was complexed with the triplex, the excitonic CD disappears at a relatively high mixing ratio, indicating the TMPyP exciton formation is inhibited by the third strand, which is located in the major groove. This observation indicates that the exciton is formed at the major groove of both AT- and GC-rich DNA, while the monomeric TMPyP binds at (or near) the minor groove of the AT site.
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Affiliation(s)
- Young-Ae Lee
- Department of Chemistry, Yeungnam University, Dae-dong, Kyoungsan City, Kyoung-buk 712-749, Republic of Korea
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Lee YA, Lee S, Cho TS, Kim C, Han SW, Kim SK. Binding Mode of meso-Tetrakis(N-methylpyridinium-4-yl)porphyrin to Poly[d(I−C)2]: Effect of Amino Group at the Minor Groove of Poly[d(G−C)2] on the Porphyrin−DNA Interaction. J Phys Chem B 2002. [DOI: 10.1021/jp025924i] [Citation(s) in RCA: 40] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Young-Ae Lee
- Department of Chemistry, Yeungnam University, 214-1 Dae-dong, Kyoungsan City, Kyoungbuk, 712-749 Republic of Korea, Department of Fine Chemistry, Seoul National University of Technology, 172 Kongneung 2-dong, Seoul, 139−743 Republic of Korea, and Department of Environmental Engineering, Kyoungwoon University, Sangdong-myun, Kumi City, Kyoung-buk, 742-711 Republic of Korea
| | - Soomin Lee
- Department of Chemistry, Yeungnam University, 214-1 Dae-dong, Kyoungsan City, Kyoungbuk, 712-749 Republic of Korea, Department of Fine Chemistry, Seoul National University of Technology, 172 Kongneung 2-dong, Seoul, 139−743 Republic of Korea, and Department of Environmental Engineering, Kyoungwoon University, Sangdong-myun, Kumi City, Kyoung-buk, 742-711 Republic of Korea
| | - Tae-Sub Cho
- Department of Chemistry, Yeungnam University, 214-1 Dae-dong, Kyoungsan City, Kyoungbuk, 712-749 Republic of Korea, Department of Fine Chemistry, Seoul National University of Technology, 172 Kongneung 2-dong, Seoul, 139−743 Republic of Korea, and Department of Environmental Engineering, Kyoungwoon University, Sangdong-myun, Kumi City, Kyoung-buk, 742-711 Republic of Korea
| | - Cheal Kim
- Department of Chemistry, Yeungnam University, 214-1 Dae-dong, Kyoungsan City, Kyoungbuk, 712-749 Republic of Korea, Department of Fine Chemistry, Seoul National University of Technology, 172 Kongneung 2-dong, Seoul, 139−743 Republic of Korea, and Department of Environmental Engineering, Kyoungwoon University, Sangdong-myun, Kumi City, Kyoung-buk, 742-711 Republic of Korea
| | - Sung Wook Han
- Department of Chemistry, Yeungnam University, 214-1 Dae-dong, Kyoungsan City, Kyoungbuk, 712-749 Republic of Korea, Department of Fine Chemistry, Seoul National University of Technology, 172 Kongneung 2-dong, Seoul, 139−743 Republic of Korea, and Department of Environmental Engineering, Kyoungwoon University, Sangdong-myun, Kumi City, Kyoung-buk, 742-711 Republic of Korea
| | - Seog K. Kim
- Department of Chemistry, Yeungnam University, 214-1 Dae-dong, Kyoungsan City, Kyoungbuk, 712-749 Republic of Korea, Department of Fine Chemistry, Seoul National University of Technology, 172 Kongneung 2-dong, Seoul, 139−743 Republic of Korea, and Department of Environmental Engineering, Kyoungwoon University, Sangdong-myun, Kumi City, Kyoung-buk, 742-711 Republic of Korea
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11
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Thomas KE, McMillin DR. Competitive Binding Studies of H2T4 with DNA Hairpins (H2T4 = meso-Tetrakis(4-(N-methylpyridiniumyl))porphyrin). J Phys Chem B 2001. [DOI: 10.1021/jp011860k] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
Affiliation(s)
- Keith E. Thomas
- Department of Chemistry, 1393 Brown Building, Purdue University, West Lafayette, Indiana 47907-1393
| | - David R. McMillin
- Department of Chemistry, 1393 Brown Building, Purdue University, West Lafayette, Indiana 47907-1393
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Trommel JS, Marzilli LG. Synthesis and DNA binding of novel water-soluble cationic methylcobalt porphyrins. Inorg Chem 2001; 40:4374-83. [PMID: 11487345 DOI: 10.1021/ic010232e] [Citation(s) in RCA: 55] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Organocobalt derivatives of tetracationic water-soluble porphyrins are difficult to prepare via the typical reductive alkylation of the Co(II)(por) (porH(2) = porphyrin ligand). None have been reported. The problem may arise because the porphyrin core is made relatively electron poor by the positively charged peripheral groups. We have circumvented this problem by using the [Co(III)(NH(3))(5)CH(3)](2+) reagent, which inserts the Co(III)-CH(3) moiety directly into porH(2) in water under basic conditions. The method afforded two new [CH(3)Co(por)](4+) derivatives, [CH(3)CoTMpyP(4)](4+) and [CH(3)CoTMAP](4+), where [TMpyP(4)](4+) and [TMAP](4+) are the coordinated, NH-deprotonated forms of meso-tetrakis(N-methyl-4-pyridiniumyl)porphyrin and meso-tetrakis(N,N,N-trimethylaniliniumyl)porphyrin, respectively. The binding of the two new [CH(3)Co(por)](4+) cations to DNA and to the synthetic DNA polymers [poly(dA-dT)](2) and [poly(dG-dC)](2) was studied. Using published criteria by which changes in DNA viscosity and in the visible and CD spectra in the Soret region can be used to assess DNA binding, we conclude that both are outside binders. A large hypochromicity of the Soret bands of the [CH(3)Co(por)](4+) cations observed upon outside binding to DNA may indicate a high degree of self-stacking. The visible absorption and CD spectra of the [CH(3)Co(por)](4+) cations in the presence of 1:1 mixtures of [poly(dA-dT)](2) and [poly(dG-dC)](2) are nearly identical to those with [poly(dA-dT)](2) alone and are very different from those of [poly(dG-dC)](2) alone. Thus, both cations show a high preference for outside binding at AT-rich over GC-rich DNA sites. Upon binding of each of the [CH(3)Co(por)](4+) cations to all of the DNA polymers, the Soret bands exhibit blue shifts, whereas the Soret bands of the corresponding [(H(2)O)(2)Co(por)](5+) cations exhibit red shifts. The blue shifts strongly suggest that the [CH(3)Co(por)](4+) cations, particularly [CH(3)CoTMAP](4+), become five-coordinate forms to some extent on DNA binding; this result is the first good evidence for the presence at equilibrium of five-coordinate CH(3)Co(III)(N(4)) forms in water.
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Affiliation(s)
- J S Trommel
- Department of Chemistry, Emory University, Atlanta, Georgia 30322, USA
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Suzuki M, Noyori R, Långström B, Watanabe Y. Molecular Design of Prostaglandin Probes in Brain Research: High, Specific Binding to a Novel Prostacyclin Receptor in the Central Nervous System. BULLETIN OF THE CHEMICAL SOCIETY OF JAPAN 2000. [DOI: 10.1246/bcsj.73.1053] [Citation(s) in RCA: 40] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/02/2023]
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Affiliation(s)
- David R. McMillin
- Department of Chemistry, Purdue University, West Lafayette, Indiana 47907-1393
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15
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Eggleston MK, Crites DK, McMillin DR. Studies of the Base-Dependent Binding of Cu(T4) to DNA Hairpins (H2T4 = meso-Tetrakis(4-(N-methylpyridiumyl))porphyrin). J Phys Chem A 1998. [DOI: 10.1021/jp980059g] [Citation(s) in RCA: 24] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
Affiliation(s)
| | - Denise K. Crites
- Department of Chemistry, Purdue University, W. Lafayette, Indiana 47907-1393
| | - David R. McMillin
- Department of Chemistry, Purdue University, W. Lafayette, Indiana 47907-1393
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Affiliation(s)
- Jean-F. Neault
- Department of Chemistry−Biology, University of Québec at Trois-Rivières, C.P. 500, TR (Québec), Canada G9A 5H7
| | - H. A. Tajmir-Riahi
- Department of Chemistry−Biology, University of Québec at Trois-Rivières, C.P. 500, TR (Québec), Canada G9A 5H7
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Affiliation(s)
- Kurt Berlin
- Department of Chemistry, Tufts University, Medford, Massachusetts 02155
| | - Rishi K. Jain
- Department of Chemistry, Tufts University, Medford, Massachusetts 02155
| | - Matthew D. Simon
- Department of Chemistry, Tufts University, Medford, Massachusetts 02155
| | - Clemens Richert
- Department of Chemistry, Tufts University, Medford, Massachusetts 02155
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Uno T, Hamasaki K, Tanigawa M, Shimabayashi S. Binding of meso-Tetrakis(N-methylpyridinium-4-yl)porphyrin to Double Helical RNA and DNA.RNA Hybrids. Inorg Chem 1997; 36:1676-1683. [PMID: 11669759 DOI: 10.1021/ic960824a] [Citation(s) in RCA: 89] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
The binding properties of meso-tetrakis(N-methylpyridinium-4-yl)porphyrin (H(2)TMPyP) to RNA and DNA.RNA hybrid duplexes were studied by absorption and circular dichroism (CD) spectra. The duplexes studied were poly(rA).poly(rU), poly(rA).poly(dT), poly(rI).poly(rC), poly(rI).poly(dC), poly(rG).poly(rC), and poly(rG).poly(dC). The hypochromicity (about 40%) and the bathochromic shift (about 15 nm) of the porphyrin Soret absorption band upon binding were quite similar among the duplexes examined. The large bathochromic shift and hypochromicity suggested a significant perturbation in the porphyrin pi electrons upon binding. H(2)TMPyP was found to bind in a single step to poly(rI).poly(rC), poly(rG).poly(rC), and poly(rG).poly(dC) and in a multistep manner to poly(rA).poly(rU), poly(rA).poly(dT), and poly(rI).poly(dC). The induced CD spectra in the visible range suggested that the porphyrin preferred to bind to the RNA duplexes with self-stacking along the polymer surface and to the hybrids with intercalation, at least at higher duplex load. This implied a distinct conformational difference between the RNA duplexes and DNA.RNA hybrids, and a drug molecule is able to recognize the difference. The number of binding sites per base pairs (n), however, was very different among the RNA duplexes examined. We also found that the intensity of the bisignate-induced CD bands is proportional to the n value. This suggested that the transition moments on the neighboring porphyrins are interacting considerably with each other to produce intense induced CD peaks.
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Affiliation(s)
- Tadayuki Uno
- Faculty of Pharmaceutical Sciences, University of Tokushima, Shomachi, Tokushima 770, Japan
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Král V, Furuta H, Shreder K, Lynch V, Sessler JL. Protonated Sapphyrins. Highly Effective Phosphate Receptors. J Am Chem Soc 1996. [DOI: 10.1021/ja9529605] [Citation(s) in RCA: 132] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Vladimír Král
- Contribution from the Department of Chemistry and Biochemistry, The University of Texas at Austin, Austin, Texas 78712-1167
| | - Hiroyuki Furuta
- Contribution from the Department of Chemistry and Biochemistry, The University of Texas at Austin, Austin, Texas 78712-1167
| | - Kevin Shreder
- Contribution from the Department of Chemistry and Biochemistry, The University of Texas at Austin, Austin, Texas 78712-1167
| | - Vincent Lynch
- Contribution from the Department of Chemistry and Biochemistry, The University of Texas at Austin, Austin, Texas 78712-1167
| | - Jonathan L. Sessler
- Contribution from the Department of Chemistry and Biochemistry, The University of Texas at Austin, Austin, Texas 78712-1167
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20
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Seiler SM, Meanwell NA. BMY 42393, An Orally Active Prostacyclin Partial Agonist Of Novel Structure. ACTA ACUST UNITED AC 1995. [DOI: 10.1111/j.1527-3466.1995.tb00309.x] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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21
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Kawakami H, Muraoka M, Sugie A, Ono K, Kojima A. Syntheses of new 3-oxa-methano-PGI1 derivatives and their biological properties. Bioorg Med Chem Lett 1993. [DOI: 10.1016/s0960-894x(01)80772-1] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
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22
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Kresge AJ, Yin Y. Concerning the weakness of intramolecular general acid catalysis in the hydrolysis of vinyl ethers.o-carboxy-?-methoxy-?,?-dimethylstyrene. J PHYS ORG CHEM 1988. [DOI: 10.1002/poc.610010502] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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