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Fry HC, Hoertz PG, Wasser IM, Karlin KD, Meyer GJ. Efficient Photodissociation of O2 from Synthetic Heme and Heme/M (M = Fe, Cu) Complexes. J Am Chem Soc 2004; 126:16712-3. [PMID: 15612695 DOI: 10.1021/ja045195f] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Single wavelength excitation (lambdaex = 355 or 532 nm) of low-temperature stabilized (198 K) synthetic heme-dioxygen and heme-dioxygen/M complexes, where M = copper or iron in a non-heme environment, results in the dissociation of dioxygen as indicated by the generation of the ferrous heme (Soret band, 427 nm) and the bleaching of the ferric-superoxide (FeIII(O2-)) 410-nm Soret band in the transient absorption difference spectrum. Dioxygen rebinds to the four heme complexes studied with comparable rate constants ( approximately 6-9 x 105 M-1 s-1). However, the quantum yield for complete dissociation of O2 from our simplest heme-O2 complex (F8)FeIII(O2-) (phi = 0.60) is higher than the other complexes measured (phi = approximately 0.2-0.3) as well as that for oxy-myoglobin (phi = 0.3).
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Affiliation(s)
- H Christopher Fry
- Department of Chemistry, Johns Hopkins University, 3400 North Charles Street, Baltimore, MD 21218, USA
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Hoshino M, Sonoki H, Suzuki H, Adachi H, Miyazaki Y, Yamanaka K. Laser Photolysis Studies of Oxy- and Carbonylhemoglobin in Red Blood Cells. Effects of Cell Membrane on Reversible Binding of O2 and CO. J Phys Chem B 2001. [DOI: 10.1021/jp010762w] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Mikio Hoshino
- The Institute of Physical and Chemical Research, Wako, Saitama 351-0198, Japan, Interdisciplinary Graduate School of Science and Engineering, Tokyo Institute of Technology, Nagatsuda-machi, Midori-ku, Yokohama, Kanagawa 226-8502, Japan, Department of Chemistry, Faculty of Engineering, Toyo University, Kujirai, Kawagoe, Saitama 350-8585, Japan, and Department of Biochemical Toxicology, Nihon University College of Pharmacy, 7-7-1 Narashinodai, Funabashi, Chiba 274-8555, Japan
| | - Hirotaka Sonoki
- The Institute of Physical and Chemical Research, Wako, Saitama 351-0198, Japan, Interdisciplinary Graduate School of Science and Engineering, Tokyo Institute of Technology, Nagatsuda-machi, Midori-ku, Yokohama, Kanagawa 226-8502, Japan, Department of Chemistry, Faculty of Engineering, Toyo University, Kujirai, Kawagoe, Saitama 350-8585, Japan, and Department of Biochemical Toxicology, Nihon University College of Pharmacy, 7-7-1 Narashinodai, Funabashi, Chiba 274-8555, Japan
| | - Hiroyuki Suzuki
- The Institute of Physical and Chemical Research, Wako, Saitama 351-0198, Japan, Interdisciplinary Graduate School of Science and Engineering, Tokyo Institute of Technology, Nagatsuda-machi, Midori-ku, Yokohama, Kanagawa 226-8502, Japan, Department of Chemistry, Faculty of Engineering, Toyo University, Kujirai, Kawagoe, Saitama 350-8585, Japan, and Department of Biochemical Toxicology, Nihon University College of Pharmacy, 7-7-1 Narashinodai, Funabashi, Chiba 274-8555, Japan
| | - Haruna Adachi
- The Institute of Physical and Chemical Research, Wako, Saitama 351-0198, Japan, Interdisciplinary Graduate School of Science and Engineering, Tokyo Institute of Technology, Nagatsuda-machi, Midori-ku, Yokohama, Kanagawa 226-8502, Japan, Department of Chemistry, Faculty of Engineering, Toyo University, Kujirai, Kawagoe, Saitama 350-8585, Japan, and Department of Biochemical Toxicology, Nihon University College of Pharmacy, 7-7-1 Narashinodai, Funabashi, Chiba 274-8555, Japan
| | - Yoshio Miyazaki
- The Institute of Physical and Chemical Research, Wako, Saitama 351-0198, Japan, Interdisciplinary Graduate School of Science and Engineering, Tokyo Institute of Technology, Nagatsuda-machi, Midori-ku, Yokohama, Kanagawa 226-8502, Japan, Department of Chemistry, Faculty of Engineering, Toyo University, Kujirai, Kawagoe, Saitama 350-8585, Japan, and Department of Biochemical Toxicology, Nihon University College of Pharmacy, 7-7-1 Narashinodai, Funabashi, Chiba 274-8555, Japan
| | - Kenzo Yamanaka
- The Institute of Physical and Chemical Research, Wako, Saitama 351-0198, Japan, Interdisciplinary Graduate School of Science and Engineering, Tokyo Institute of Technology, Nagatsuda-machi, Midori-ku, Yokohama, Kanagawa 226-8502, Japan, Department of Chemistry, Faculty of Engineering, Toyo University, Kujirai, Kawagoe, Saitama 350-8585, Japan, and Department of Biochemical Toxicology, Nihon University College of Pharmacy, 7-7-1 Narashinodai, Funabashi, Chiba 274-8555, Japan
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Nakagawa A, Komatsu T, Tsuchida E. Photoreduction of autooxidized albumin-heme hybrid in saline solution: revival of its O(2)-binding ability. Bioconjug Chem 2001; 12:648-52. [PMID: 11459472 DOI: 10.1021/bc000106j] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Recombinant human serum albumin (rHSA) incorporating 2-[8-[N-(2-methylimidazolyl)]octanoyloxymethyl]-5,10,15,20-tetrakis(alpha,alpha,alpha,alpha-o-pivalamido)phenylporphinatoiron(II)s (Fe(II)Ps) [rHSA-Fe(II)P] is a synthetic hemoprotein which can bind and release O(2) reversibly under physiological conditions (saline solution [NaCl]: 150 mM, pH 7.3) as do hemoglobin and myoglobin. However, the central ferrous ions of Fe(II)Ps are slowly oxidized to O(2)-inactive ferric forms. Based on the UV-vis. absorption spectroscopy, the majority of the autooxidized Fe(III)Ps in albumin are determined to be six-coordinate high-spin complexes with a proximal imidazole and a chloride anion, which show ligand-to-metal charge transfer (LMCT) absorption at 330 nm. Interestingly, photoirradiation of this LMCT band under an argon atmosphere led to reduction of the central ferric iron of Fe(III)P, allowing the revival of the O(2)-binding ability. The ratio of the photoreduction reached a maximum of 83%, which is probably due to the partial dissociation of the axial imidazole. The same photoirradiation under a CO atmosphere provides the corresponding carbonyl rHSA-Fe(II)P. Laser flash photolysis experiments revealed that the reduction was completed within 100 ns. The quantum yields (Phi) of these photoreductions were approximately 0.01.
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Affiliation(s)
- A Nakagawa
- Department of Polymer Chemistry, Advanced Research Institute for Science and Engineering, Waseda University, Tokyo 169-8555, Japan
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Adachi H, Sonoki H, Hoshino M, Wakasa M, Hayashi H, Miyazaki Y. Photodissociation of Nitric Oxide from Nitrosyl Metalloporphyrins in Micellar Solutions. J Phys Chem A 2000. [DOI: 10.1021/jp002515i] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Affiliation(s)
- Haruna Adachi
- The Institute of Physical and Chemical Research, Wako, Saitama 351-0198, Japan
| | - Hirotaka Sonoki
- The Institute of Physical and Chemical Research, Wako, Saitama 351-0198, Japan
| | - Mikio Hoshino
- The Institute of Physical and Chemical Research, Wako, Saitama 351-0198, Japan
| | - Masanobu Wakasa
- The Institute of Physical and Chemical Research, Wako, Saitama 351-0198, Japan
| | - Hisaharu Hayashi
- The Institute of Physical and Chemical Research, Wako, Saitama 351-0198, Japan
| | - Yoshio Miyazaki
- Department of Chemistry, Faculty of Engineering, Toyo University, Kujirai, Kawagoe, Saitama 350-8585, Japan
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Sakai H, Onuma H, Umeyama M, Takeoka S, Tsuchida E. Photoreduction of methemoglobin by irradiation in the near-ultraviolet region. Biochemistry 2000; 39:14595-602. [PMID: 11087415 DOI: 10.1021/bi0014204] [Citation(s) in RCA: 18] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Ferric metHb can be photoreduced to the ferrous state by direct photoexcitation in the near-ultraviolet region. In this research, we studied the mechanism and facilitating conditions for the photoreduction and the resulting restoration of O(2) binding. MetHb in phosphate-buffered saline or pure water in a CO atmosphere was photoreduced to form HbCO by illuminating the N band (365 nm), one of the porphyrin pi --> pi transitions, whereas the photoreduction did not occur in Ar, N(2), or O(2). The transient absorption spectrum exhibited the generation of deoxyHb within 30 ns in both the CO and Ar atmospheres; however, only in CO did the subsequent CO binding inhibit the back reaction. The photoreduction rate was dependent on the pH and ligand anions, showing that aquametHb in the high-spin state was predominant for the photoreduction. Axial ligand-to-metal charge-transfer (LMCT) bands overlap with the Soret and Q bands in metHb; however, the excitation of these bands showed little photoreduction, indicating that the contribution of these LMCT bands is minimal. Excitation of the N band significantly contributes to the photoreduction, and this is facilitated by the external addition of mannitol, hyaluronic acid, Trp, Tyr, etc. Especially, Trp allowed the photoreduction even in an Ar atmosphere, and the reduced Hb can be converted to HbO(2) by O(2) bubbling. One mechanism of the metHb photoreduction that is proposed on the basis of these results consists of a charge transfer from the porphyrin ring to the central ferric iron to form the porphyrin pi cation radical and ferrous iron by the N band excitation, and the contribution of the amino acid residues in the globin chain as an electron donor or an electron pathway.
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Affiliation(s)
- H Sakai
- Department of Polymer Chemistry, Advanced Research Institute for Science and Engineering, Waseda University, Tokyo 169-8555, Japan
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