1
|
Ide Y, Murai N, Ishimae H, Suzuki M, Mori S, Takahashi M, Nakamura M, Yoshino K, Ikeue T. Spin-crossover between high-spin (S = 5/2) and low-spin (S = 1/2) states in six-coordinate iron(iii) porphyrin complexes having two pyridine-N oxide derivatives. Dalton Trans 2016; 46:242-249. [PMID: 27924994 DOI: 10.1039/c6dt03859j] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
In contrast to the general tendency that six coordinate iron(iii) porphyrin complexes with neutral oxygen ligands adopt a high-spin state in a wide range of temperature, some complexes with substituted pyridine N-oxides have exhibited spin-crossover from high-spin to low-spin states with decreasing temperature both in solution and in the solid state.
Collapse
Affiliation(s)
- Yuki Ide
- Department of Chemistry, Interdisciplinary Graduate School of Science and Engineering, Shimane University, 1060 Nishikawatsu, Matsue 690-8504, Japan.
| | - Nami Murai
- Department of Chemistry, Interdisciplinary Graduate School of Science and Engineering, Shimane University, 1060 Nishikawatsu, Matsue 690-8504, Japan.
| | - Hiroki Ishimae
- Department of Chemistry, Interdisciplinary Graduate School of Science and Engineering, Shimane University, 1060 Nishikawatsu, Matsue 690-8504, Japan.
| | - Masaaki Suzuki
- Department of Chemistry, Interdisciplinary Graduate School of Science and Engineering, Shimane University, 1060 Nishikawatsu, Matsue 690-8504, Japan.
| | - Shigeki Mori
- Advanced Research Support Center, Ehime University, 2-5, Bunkyo-cho, Matsuyama, 790-8577, Japan
| | - Masashi Takahashi
- Department of Chemistry, Faculty of Science, Toho University, Funabashi 274-8510, Japan
| | - Mikio Nakamura
- Department of Chemistry, Faculty of Science, Toho University, Funabashi 274-8510, Japan
| | - Katsumi Yoshino
- Shimane Institute for Industrial Technology, 1 Hokuryo, Matsue, Shimane 690-0816, Japan
| | - Takahisa Ikeue
- Department of Chemistry, Interdisciplinary Graduate School of Science and Engineering, Shimane University, 1060 Nishikawatsu, Matsue 690-8504, Japan.
| |
Collapse
|
2
|
Shibata T, Kanai Y, Nishimura R, Xu L, Moritaka Y, Suzuki A, Neya S, Nakamura M, Yamamoto Y. Characterization of Ground State Electron Configurations of High-Spin Quintet Ferrous Heme Iron in Deoxy Myoglobin Reconstituted with Trifluoromethyl Group-Substituted Heme Cofactors. Inorg Chem 2016; 55:12128-12136. [DOI: 10.1021/acs.inorgchem.6b01360] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Tomokazu Shibata
- Department of Chemistry, University of Tsukuba, Tsukuba 305-8571, Japan
| | - Yuki Kanai
- Department of Chemistry, University of Tsukuba, Tsukuba 305-8571, Japan
| | - Ryu Nishimura
- Department of Chemistry, University of Tsukuba, Tsukuba 305-8571, Japan
| | - Liyang Xu
- Department of Chemistry, University of Tsukuba, Tsukuba 305-8571, Japan
| | - Yuki Moritaka
- Department of Chemistry, University of Tsukuba, Tsukuba 305-8571, Japan
| | - Akihiro Suzuki
- Department of Materials Engineering, Nagaoka National College of Technology, Nagaoka 940-8532, Japan
| | - Saburo Neya
- Department of Physical Chemistry, Graduate School of
Pharmaceutical Sciences, Chiba University, Chuoh-Inohana, Chiba 260-8675, Japan
| | - Mikio Nakamura
- Department
of Chemistry, Faculty of Science, Toho University, Funabashi, Chiba 274-8510, Japan
| | - Yasuhiko Yamamoto
- Department of Chemistry, University of Tsukuba, Tsukuba 305-8571, Japan
- Life Science
Center of Tsukuba Advanced Research Alliance, University of Tsukuba, Tsukuba 305-8577, Japan
| |
Collapse
|
3
|
Neya S, Takahashi A, Ode H, Hoshino T, Ikezaki A, Ohgo Y, Takahashi M, Furutani Y, Lórenz-Fonfría VA, Kandori H, Hiramatsu H, Kitagawa T, Teraoka J, Funasaki N, Nakamura M. Electronic Properties in a Five-Coordinate Azido Complex of Nonplanar Iron(III) Porphyrin: Revisiting to Quantum Mechanical Spin Admixing. BULLETIN OF THE CHEMICAL SOCIETY OF JAPAN 2008. [DOI: 10.1246/bcsj.81.136] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
|
4
|
Neya S, Takahashi A, Ode H, Hoshino T, Hata M, Ikezaki A, Ohgo Y, Takahashi M, Hiramatsu H, Kitagawa T, Furutani Y, Kandori H, Funasaki N, Nakamura M. Magnetic and Infrared Properties of the Azide Complex of (2,7,12,17-Tetrapropylporphycenato)iron(III): A Novel Admixing Mechanism of theS = 5/2 andS = 3/2 States. Eur J Inorg Chem 2007. [DOI: 10.1002/ejic.200601183] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
|
5
|
Neya S, Tsubaki M, Hori H, Yonetani T, Funasaki N. Unusual spin state equilibrium of azide metmyoglobin induced by ferric corrphycene. Inorg Chem 2001; 40:1220-5. [PMID: 11300822 DOI: 10.1021/ic000684b] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Myoglobin was reconstituted with the ferric complex of corrphycene, a novel porphyrin isomer with a rearranged tetrapyrrole array, to investigate the influence of porphyrin deformation on the equilibrium between high-spin (S = 5/2) and low-spin (S = 1/2) states in the azide derivative. The azide affinity, 2.5 x 10(4) M(-1), was 1 order of magnitude lower than the corresponding values of a reference myoglobin containing an electron-deficient diformylheme similar to the corrphycene. Analysis of the visible absorption spectrum over a range of 0-40 degrees C reveals that the population of high-spin iron is 76-82% at room temperature for azide metmyoglobin complexed with ferric corrphycene. The unusual predominance of the high-spin state was verified from the infrared spectrum of coordinating azide, where the high-spin peak at 2046 cm(-1) is 4-fold larger in intensity than the 2023 cm(-1) low-spin band. Electron paramagnetic resonance at 15 K further indicated that the iron-histidine bond is cleaved to form a five-coordinate derivative in some fraction of the myoglobin. The remarkable high-spin bias of the spin equilibrium at room temperature and cleavage of the iron-histidine bond at 15 K could be explained in terms of the contracted and trapezoidal metallo core that weakens the iron-histidine bond of azide metmyoglobin bearing corrphycene.
Collapse
Affiliation(s)
- S Neya
- Department of Physical Chemistry, Kyoto Pharmaceutical University, Yamashina, Kyoto 607-8414, Japan.
| | | | | | | | | |
Collapse
|
6
|
Yamamoto Y. 1H NMR Study of the Heme Molecular Structure in Sperm Whale Met-Aquo and Met-Imidazole Myoglobins. BULLETIN OF THE CHEMICAL SOCIETY OF JAPAN 1996. [DOI: 10.1246/bcsj.69.2947] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
|
7
|
Peyton DH. 1H NMR resonance assignments in a paramagnetic heme protein by two-dimensional spectroscopy: heme resonances in equine met-azido myoglobin. Biochem Biophys Res Commun 1991; 175:515-9. [PMID: 2018499 DOI: 10.1016/0006-291x(91)91594-3] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Abstract
Specific heme protons for the majority of resonances in the downfield resolved region of equine met-azido myoglobin have been assigned using solely the two-dimensional 1H NMR experiments NOESY and COSY. Metazido myoglobin provides a useful test case for the applicability of these techniques to paramagnetic proteins for the following reasons. First met-azido myoglobin is a mixed spin-state protein, with significantly shorter relaxation times and broadened lines relative to pure low-spin systems (eg., met-cyano myoglobin). Second, met-azido hemoglobin and met-azido myoglobin are important as models for the physiological forms of hemoglobin. Third, a few sperm whale met-azido myoglobin resonances have been previously assigned, which permits a comparison of assignments for these similar proteins, and a check of the method presented here.
Collapse
Affiliation(s)
- D H Peyton
- Chemistry Department, Portland State University, Oregon 97207-0751
| |
Collapse
|
8
|
Neya S, Funasaki N, Imai K. Etiohemin as a prosthetic group of myoglobin. BIOCHIMICA ET BIOPHYSICA ACTA 1989; 996:226-32. [PMID: 2752047 DOI: 10.1016/0167-4838(89)90251-3] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
Abstract
Sperm whale myoglobin was reconstituted with etioheme and the stoichiometric complex formation was confirmed. The proton NMR spectrum of the deoxy myoglobin exhibits an NH signal from the proximal histidine at 78.6 ppm, indicating heme incorporation into the heme pocket to form the Fe-N(His-F8) bond. The appearance of a single set of the heme-methyl NMR signals shows that etioheme without acid side-chains specifically interacts with the surrounding globin. The visible spectral data suggest retention of a normal iron coordination structure. The functional and NMR spectral properties of etioheme myoglobin are similar to those of mesoheme myoglobin, reflecting the absence of the electron-withdrawing heme vinyl groups.
Collapse
Affiliation(s)
- S Neya
- Department of Physical Chemistry, Kyoto Pharmaceutical University, Yamashina, Japan
| | | | | |
Collapse
|
9
|
Yamamoto Y, La Mar GN. Proton NMR investigation of the influence of subunit assembly on the low-spin in equilibrium high-spin equilibrium of met-azido hemoglobin A. BIOCHIMICA ET BIOPHYSICA ACTA 1989; 996:187-94. [PMID: 2546603 DOI: 10.1016/0167-4838(89)90246-x] [Citation(s) in RCA: 20] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Abstract
The 1H nuclear magnetic resonance signals for the side-chain labile protons of the proximal His-F8 in met-azido derivatives of the isolated chains and intact tetramer of hemoglobin have been identified. Assignment of the two peaks to the individual subunits of the intact tetramer was effected by the basis of the strong similarity of shift of one of the two peaks to that of met-azido semi-hemoglobin, where hemes occupy primarily the alpha subunits, with the heme cavity vacant in the adjacent beta subunits. The magnitudes of the hyperfine shift for both the His-F8 ring NH and the heme methyls reflect the degree of high-spin character in the thermal spin equilibrium between the high-spin, S = 5/2, and low-spin, S = 1/2, states. The changes in these shifts upon tetramer assembly demonstrate that formation of the intersubunit contacts in the R-state met-azido hemoglobin from the isolated chains causes a slight decrease in high-spin character of the alpha (22 to 20%) and a marked increase (5 to 11%) in the high-spin character of the beta subunits. The changes in spin-character are interpreted in terms of slight increase and decrease in the strength of the iron-His F8 bond upon tetramer assembly in the alpha and beta subunits, respectively. These changes in axial bonding upon forming R-state intersubunit contacts are consistent with previous observation on forming the R-state deoxy Hb tetramer from the isolated chains (Nagai, K., La Mar, G.N., Jue, T. and Bunn, H.F. (1982) Biochemistry 21, 842-847).
Collapse
Affiliation(s)
- Y Yamamoto
- Department of Chemistry, University of California, Davis 95616
| | | |
Collapse
|
10
|
Ishimori K, Morishima I. Study of the specific heme orientation in reconstituted hemoglobins. Biochemistry 1988; 27:4747-53. [PMID: 3167013 DOI: 10.1021/bi00413a025] [Citation(s) in RCA: 22] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
Abstract
NMR studies of the recombination reaction of apohemoglobin derivatives with natural and unnatural hemes and of the heme-exchange reaction for reconstituted hemoglobin have revealed that the heme is incorporated into the apoprotein with stereospecific heme orientations dependent upon the heme peripheral 2,4-substituents and the axial iron ligand(s). Heme orientations also depend on whether recombination occurs at the alpha or beta subunit and on whether or not the complementary subunit is occupied by the heme. In the recombination reaction with the azido complex of deuterohemin, the alpha subunit of the apohemoglobin preferentially combines with the hemin in the "disordered" heme orientation, whereas protohemin is inserted in either of two heme orientations. Mesohemin inserts predominantly in the "native" heme orientation. For the beta subunit, specific heme orientation was also encountered, but the specificity was somewhat different from that of the alpha subunit. It was also shown that the specific heme orientation in both subunits is substantially affected by the axial heme ligands. These findings imply that apohemoglobin senses the steric bulkiness of both the porphyrin 2,4-substituents and the axial iron ligands in the heme-apoprotein recombination reaction. To gain an insight into the effect of the protein structure, the heme reconstitution reaction of semihemoglobin, demonstrating that the heme orientation in the reconstituted semihemoglobin with the azido-deuterohemin complex was in the native form, was also examined.(ABSTRACT TRUNCATED AT 250 WORDS)
Collapse
Affiliation(s)
- K Ishimori
- Division of Molecular Engineering, Graduate School of Engineering, Kyoto University, Japan
| | | |
Collapse
|
11
|
Neya S, Funasaki N. Proton NMR study of the cyanide metmyoglobin reconstituted with meso-tetraalkylhemins. Dynamic free rotation of the synthetic hemins in the heme pocket. J Biol Chem 1987. [DOI: 10.1016/s0021-9258(18)48303-2] [Citation(s) in RCA: 27] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022] Open
|