1
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Zhang F, Aquino GV, Dabi A, Nugent WH, Song BK, Bruce ED. Oral ingestion of a novel oxygenating compound, Ox66™, is non-toxic and has the potential to increase oxygenation. Food Chem Toxicol 2018; 125:217-224. [PMID: 30584904 DOI: 10.1016/j.fct.2018.12.034] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/05/2018] [Revised: 12/10/2018] [Accepted: 12/21/2018] [Indexed: 11/26/2022]
Abstract
Ox66™ is a novel solid state oxygenating compound. In order to support the use of Ox66™ as a potential oxygenating supplement to injured cells, this study evaluated the safety of Ox66™, its ability to withstand the conditions in the digestive tract, and its potential to increase oxygenation in the mesentery in rats. The toxicity of Ox66™ was evaluated by performing acute (10-day) and chronic (90-day) feeding studies on rats, the stability of the compound in the digestive tract was evaluated via ex vivo simulated digestion and subsequent CFDA viability assay on gut epithelial cells, and its capacity for oxygenation in the mesenteric microcirculation was determined by interstitial fluid pressure (PISF) O2 measurements upon injection into the small intestine of rats. No toxicity was found associated with acute or chronic oral administration of the compound in rats, and the compound was able to withstand the environment of the digestive tract in vitro. Based on the acute animal feeding study, the NOAEL was considered to be 1000 mg/kg/day. This proof-of-concept study further demonstrates the potential of Ox66™ to function as an oxygenating supplement that might be useful for treating either pathological hypoxic-related conditions or to improve oxygenation levels during or after exercise under healthy conditions.
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Affiliation(s)
- Fan Zhang
- Baylor University, Department of Environmental Science, Waco, TX, 76798, USA
| | - Grace V Aquino
- Baylor University, Department of Environmental Science, Waco, TX, 76798, USA
| | - Amjad Dabi
- Baylor University, Department of Environmental Science, Waco, TX, 76798, USA
| | | | - Bjorn K Song
- Song Biotechnologies LLC, Baltimore, MD, 21030, USA
| | - Erica D Bruce
- Baylor University, Department of Environmental Science, Waco, TX, 76798, USA; Baylor University, Department of Biology, Waco, TX, 76798, USA; Baylor University, Institute of Biomedical Studies, Waco, TX, 76798, USA.
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2
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Fathollahipour S, Patil PS, Leipzig ND. Oxygen Regulation in Development: Lessons from Embryogenesis towards Tissue Engineering. Cells Tissues Organs 2018; 205:350-371. [PMID: 30273927 DOI: 10.1159/000493162] [Citation(s) in RCA: 49] [Impact Index Per Article: 8.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 08/11/2018] [Indexed: 12/19/2022] Open
Abstract
Oxygen is a vital source of energy necessary to sustain and complete embryonic development. Not only is oxygen the driving force for many cellular functions and metabolism, but it is also involved in regulating stem cell fate, morphogenesis, and organogenesis. Low oxygen levels are the naturally preferred microenvironment for most processes during early development and mainly drive proliferation. Later on, more oxygen and also nutrients are needed for organogenesis and morphogenesis. Therefore, it is critical to maintain oxygen levels within a narrow range as required during development. Modulating oxygen tensions is performed via oxygen homeostasis mainly through the function of hypoxia-inducible factors. Through the function of these factors, oxygen levels are sensed and regulated in different tissues, starting from their embryonic state to adult development. To be able to mimic this process in a tissue engineering setting, it is important to understand the role and levels of oxygen in each developmental stage, from embryonic stem cell differentiation to organogenesis and morphogenesis. Taking lessons from native tissue microenvironments, researchers have explored approaches to control oxygen tensions such as hemoglobin-based, perfluorocarbon-based, and oxygen-generating biomaterials, within synthetic tissue engineering scaffolds and organoids, with the aim of overcoming insufficient or nonuniform oxygen levels and nutrient supply.
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Affiliation(s)
| | - Pritam S Patil
- Department of Chemical and Biomolecular Engineering, University of Akron, Akron, Ohio, USA
| | - Nic D Leipzig
- Department of Chemical and Biomolecular Engineering, University of Akron, Akron, Ohio,
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3
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Samajdar RN, Manogaran D, Yashonath S, Bhattacharyya AJ. Using porphyrin–amino acid pairs to model the electrochemistry of heme proteins: experimental and theoretical investigations. Phys Chem Chem Phys 2018; 20:10018-10029. [DOI: 10.1039/c8cp00605a] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Deconstructing the complex electrochemistry of heme proteins into simpler heme–amino acid interactions.
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Affiliation(s)
- Rudra N. Samajdar
- Solid State and Structural Chemistry Unit
- Indian Institute of Science
- Bangalore 560012
- India
| | - Dhivya Manogaran
- Solid State and Structural Chemistry Unit
- Indian Institute of Science
- Bangalore 560012
- India
| | - S. Yashonath
- Solid State and Structural Chemistry Unit
- Indian Institute of Science
- Bangalore 560012
- India
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4
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Shafizadeh N, Soorkia S, Grégoire G, Broquier M, Crestoni ME, Soep B. Dioxygen Binding to Protonated Heme in the Gas Phase, an Intermediate Between Ferric and Ferrous Heme. Chemistry 2017; 23:13493-13500. [DOI: 10.1002/chem.201702615] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/07/2017] [Indexed: 12/18/2022]
Affiliation(s)
- Niloufar Shafizadeh
- Institut des Sciences Moléculaires d'Orsay (ISMO), CNRS, Université Paris-Sud; Université Paris-Saclay; 91405 Orsay France
| | - Satchin Soorkia
- Institut des Sciences Moléculaires d'Orsay (ISMO), CNRS, Université Paris-Sud; Université Paris-Saclay; 91405 Orsay France
| | - Gilles Grégoire
- Institut des Sciences Moléculaires d'Orsay (ISMO), CNRS, Université Paris-Sud; Université Paris-Saclay; 91405 Orsay France
| | - Michel Broquier
- Institut des Sciences Moléculaires d'Orsay (ISMO), CNRS, Université Paris-Sud; Université Paris-Saclay; 91405 Orsay France
- Centre Laser de l'Université Paris-Sud (CLUPS/LUMAT), Université Paris-Sud, CNRS, IOGS, Université Paris-Saclay; 91405 Orsay France
| | - Maria-Elisa Crestoni
- Dipartimento di Chimica e Tecnologie del Farmaco; Università degli Studi di Roma “La Sapienza”; P. le A. Moro 5 00185 Roma Italy
| | - Benoît Soep
- LIDYL, CEA, CNRS; Université Paris-Saclay, CEA Saclay; 91191 Gif-sur-Yvette France
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5
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Zheng H, Langner KM, Shields GP, Hou J, Kowiel M, Allen FH, Murshudov G, Minor W. Data mining of iron(II) and iron(III) bond-valence parameters, and their relevance for macromolecular crystallography. Acta Crystallogr D Struct Biol 2017; 73:316-325. [PMID: 28375143 PMCID: PMC5503122 DOI: 10.1107/s2059798317000584] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/07/2016] [Accepted: 01/12/2017] [Indexed: 01/13/2023] Open
Abstract
The bond-valence model is a reliable way to validate assumed oxidation states based on structural data. It has successfully been employed for analyzing metal-binding sites in macromolecule structures. However, inconsistent results for heme-based structures suggest that some widely used bond-valence R0 parameters may need to be adjusted in certain cases. Given the large number of experimental crystal structures gathered since these initial parameters were determined and the similarity of binding sites in organic compounds and macromolecules, the Cambridge Structural Database (CSD) is a valuable resource for refining metal-organic bond-valence parameters. R0 bond-valence parameters for iron(II), iron(III) and other metals have been optimized based on an automated processing of all CSD crystal structures. Almost all R0 bond-valence parameters were reproduced, except for iron-nitrogen bonds, for which distinct R0 parameters were defined for two observed subpopulations, corresponding to low-spin and high-spin states, of iron in both oxidation states. The significance of this data-driven method for parameter discovery, and how the spin state affects the interpretation of heme-containing proteins and iron-binding sites in macromolecular structures, are discussed.
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Affiliation(s)
- Heping Zheng
- Department of Molecular Physiology and Biological Physics, University of Virginia, Charlottesville, VA 22901, USA
| | - Karol M. Langner
- Department of Molecular Physiology and Biological Physics, University of Virginia, Charlottesville, VA 22901, USA
| | - Gregory P. Shields
- Cambridge Crystallographic Data Centre, 12 Union Road, Cambridge CB2 1EZ, England
| | - Jing Hou
- Department of Molecular Physiology and Biological Physics, University of Virginia, Charlottesville, VA 22901, USA
| | - Marcin Kowiel
- Department of Molecular Physiology and Biological Physics, University of Virginia, Charlottesville, VA 22901, USA
- Center for Biocrystallographic Research, Institute of Bioorganic Chemistry, Polish Academy of Sciences, 61-704 Poznan, Poland
| | - Frank H. Allen
- Cambridge Crystallographic Data Centre, 12 Union Road, Cambridge CB2 1EZ, England
| | - Garib Murshudov
- MRC Laboratory of Molecular Biology, Cambridge CB2 0QH, England
| | - Wladek Minor
- Department of Molecular Physiology and Biological Physics, University of Virginia, Charlottesville, VA 22901, USA
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6
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IR Spectra of Different O 2-Content Hemoglobin from Computational Study: Promising Detector of Hemoglobin Variant in Medical Diagnosis. Interdiscip Sci 2017; 9:322-331. [PMID: 28352971 DOI: 10.1007/s12539-017-0217-8] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/13/2016] [Revised: 01/08/2017] [Accepted: 02/04/2017] [Indexed: 10/19/2022]
Abstract
IR spectra of heme and different O2-content hemoglobin were studied by the quantum computation method at the molecule level. IR spectra of heme and different O2-content hemoglobin were quantificationally characterized from 0 to 100 THz. The IR spectra of oxy-heme and de-oxy-heme are obviously different at the frequency regions of 9.08-9.48, 38.38-39.78, 50.46-50.82, and 89.04-91.00 THz. At 24.72 THz, there exists the absorption peak for oxy-heme, whereas there is not the absorption peak for de-oxy-heme. Whether the heme contains Fe-O-O bond or not has the great influence on its IR spectra and vibration intensities of functional groups in the mid-infrared area. The IR adsorption peak shape changes hardly for different O2-content hemoglobin. However, there exist three frequency regions corresponding to the large change of IR adsorption intensities for containing-O2 hemoglobin in comparison with de-oxy-hemoglobin, which are 11.08-15.93, 44.70-50.22, and 88.00-96.68 THz regions, respectively. The most differential values with IR intensity of different O2-content hemoglobin all exceed 1.0 × 104 L mol-1 cm-1. With the increase of oxygen content, the absorption peak appears in the high-frequency region for the containing-O2 hemoglobin in comparison with de-oxy-hemoglobin. The more the O2-content is, the greater the absorption peak is at the high-frequency region. The IR spectra of different O2-content hemoglobin are so obviously different in the mid-infrared region that it is very easy to distinguish the hemoglobin variant by means of IR spectra detector. IR spectra of hemoglobin from quantum computation can provide scientific basis and specific identification of hemoglobin variant resulting from different O2 contents in medical diagnosis.
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7
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Ferrand L, Soorkia S, Grégoire G, Broquier M, Soep B, Shafizadeh N. Bonding of heme Fe(III) with dioxygen: observation and characterization of an incipient bond. Phys Chem Chem Phys 2016; 17:25693-9. [PMID: 26059068 DOI: 10.1039/c5cp01585e] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Abstract
While ferrous heme (Fe(II)) within hemoproteins binds dioxygen efficiently, it has not yet been possible to observe the analog complex with ferric heme (Fe(III)). We present the first observation and characterization of the latter complex in a cooled ion trap. The bond formation enthalpy of ferric heme-O2 has been derived from the Van't Hoff equation by means of temperature dependent measurements. The binding energy of the [heme Fe(III)-O2](+) ionic complex is rather strong as compared to that of [heme Fe(III)-N2](+), showing the formation of an incipient Fe-O bond, which is confirmed by the electronic absorption spectra of the two complexes. This first observation of the [heme Fe(III)-O2](+) complex lays the basis for the precise description of its electronic states.
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Affiliation(s)
- Léa Ferrand
- ISMO, Univ Paris-Sud, CNRS UMR 8214, bat 210 Univ Paris-Sud 91405, Orsay Cedex, France.
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8
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Huwald D, Schrapers P, Kositzki R, Haumann M, Hemschemeier A. Characterization of unusual truncated hemoglobins of Chlamydomonas reinhardtii suggests specialized functions. PLANTA 2015; 242:167-85. [PMID: 25893868 DOI: 10.1007/s00425-015-2294-4] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/04/2015] [Accepted: 03/27/2015] [Indexed: 05/04/2023]
Abstract
Annotated hemoglobin genes in Chlamydomonas reinhardtii form functional globins, despite unusual architectures. Spectral characteristics show subtle biochemical differences. Multiple globins might help the alga to cope with its versatile environment. The unicellular green alga C. reinhardtii is a photosynthetic, often soil-dwelling organism, subjected to a changeable environment in nature. The alga contains 12 genes encoding so-called truncated hemoglobins that feature a two-on-two helical fold instead of the three-on-three helix arrangement of the long-studied vertebrate globins or plant symbiotic and non-symbiotic hemoglobins. In plants, non-symbiotic hemoglobins often play a role in acclimation to stress, and we could show recently that one of the C. reinhardtii globin genes is vital for anoxic growth. Here, three further globin encoding transcripts (Cre16.g661000.t1.1, Cre16.g661300.t2.1 and Cre16.g662750.t1.2) were heterologously expressed along with the recently studied THB1. UV-Vis and X-ray absorption spectroscopy analyses show that the sequences indeed encode functional hemoglobins, despite their uncommon primary sequences, which include long C-termini without any predictable function, or a split heme-binding domain. The proteins show some variations regarding the coordination of the heme iron or the interaction with diatomic ligands, indicating different functionalities. The respective transcripts are not responsive to the nitrogen source, in contrast to results reported for THB1, but they accumulate in darkness. This work advances experimental data on the very large globin family in general, and, more specifically, on hemoglobins in photosynthetic organisms.
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Affiliation(s)
- Dennis Huwald
- Work Group Photobiotechnology, Department of Plant Biochemistry, Faculty of Biology and Biotechnology, Ruhr-University of Bochum, Universitätsstr. 150, ND2/134, 44801, Bochum, Germany
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9
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Guégan F, Mignon P, Tognetti V, Joubert L, Morell C. Dual descriptor and molecular electrostatic potential: complementary tools for the study of the coordination chemistry of ambiphilic ligands. Phys Chem Chem Phys 2014; 16:15558-69. [DOI: 10.1039/c4cp01613k] [Citation(s) in RCA: 32] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
Abstract
The possibility to retrieve the coordinating properties of ligands by a combined dual descriptor and molecular electrostatic potential analysis is shown, yielding a potentially predictive tool of their ambiphilicity and selectivity.
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Affiliation(s)
- Frédéric Guégan
- Laboratoire des Sciences Analytiques
- UMR CNRS 5280
- Université Claude Bernard Lyon
- 1 69622 Villeurbanne Cedex, France
| | - Pierre Mignon
- Laboratoire des Sciences Analytiques
- UMR CNRS 5280
- Université Claude Bernard Lyon
- 1 69622 Villeurbanne Cedex, France
| | - Vincent Tognetti
- Normandy University
- COBRA UMR 6014 & FR 3038
- Université de Rouen
- INSA Rouen
- CNRS
| | - Laurent Joubert
- Normandy University
- COBRA UMR 6014 & FR 3038
- Université de Rouen
- INSA Rouen
- CNRS
| | - Christophe Morell
- Laboratoire des Sciences Analytiques
- UMR CNRS 5280
- Université Claude Bernard Lyon
- 1 69622 Villeurbanne Cedex, France
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10
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X-Ray absorption spectroscopic studies on iron in soybean lipoxygenase: A model for mammalian lipoxygenases. ACTA ACUST UNITED AC 2010. [DOI: 10.1002/recl.19901090302] [Citation(s) in RCA: 34] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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11
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Pin S, Alpert B, Congiu-Castellano A, Della Longa S, Bianconi A. X-ray absorption spectroscopy of hemoglobin. Methods Enzymol 1994; 232:266-92. [PMID: 8057865 DOI: 10.1016/0076-6879(94)32052-7] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
Affiliation(s)
- S Pin
- Laboratoire de Biologie Physico-Chimique, Université Paris, VII, France
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12
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Cartier C, Momenteau M, Dartyge E, Fontaine A, Tourillon G, Bianconi A, Verdaguer M. X-ray absorption spectroscopy of carbonyl basket handle Fe(II) porphyrins: the distortion of the tetrapyrrolic macrocycle. BIOCHIMICA ET BIOPHYSICA ACTA 1992; 1119:169-74. [PMID: 1540648 DOI: 10.1016/0167-4838(92)90387-s] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Abstract
The distortion of the tetrapyrrolic macrocycle, the Fe-C-O bond angle and the Fe local electronic structure of carbonyl basket-handle Fe2+ porphyrins as a function of the basket-handle chain length have been studied by X-ray absorption near edge structure (XANES) spectroscopy, both in the solid state and in toluene solution. The Fe-C-O bond angle has been found to be linear in all compounds while the increasing distortion of the macrocycle with shortening of the chain length is indicated by the multiple scattering resonance in the heme plane appearing at 22 eV in the XANES spectrum.
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Affiliation(s)
- C Cartier
- Laboratoire de Chimie Inorganique, U.A.C.N.R.S. 420, Université de Paris Sud, Orsay, France
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13
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Shiro Y, Makino R, Sato F, Oyanagi H, Matsushita T, Ishimura Y, Iizuka T. Structural and electronic characterization of heme moiety in oxygenated hemoproteins by using XANES spectroscopy. BIOCHIMICA ET BIOPHYSICA ACTA 1991; 1115:101-7. [PMID: 1764462 DOI: 10.1016/0304-4165(91)90018-c] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Abstract
Iron K-edge X-ray absorption near edge structure (XANES) spectra were measured for oxy-forms of cytochrome P-450cam (P-450cam), horseradish peroxidase (HRP) and myoglobin (Mb) by using Synchrotoron Radiation of Photon Factory (Tsukuba). A pronounced 1s-4p transition and some fine structures were well-resolved in the spectra obtained. Comparing the spectra, the features at the fine structures termed P, C and D, were similar among the three hemoproteins, suggesting a similar site-symmetry around the heme iron and the same Fe-O-O bond angle (about 115 degrees). On the other hand, absorption features at the edge region (7115-7135 eV) were slightly but significantly different from one another; the absorption intensity at 7115-7125 eV region increased in the order of Mb, HRP and P-450cam, while that at 7125-7135 eV decreased in the same order. A similar absorption feature was also obtained with their deoxy (ferrous high spin) forms. We assumed that the absorption at the lower energy region (7115-7125 eV) reflects the pi-character in the Fe-ligand bond, whereas that at the higher energy region (7125-7135 eV) does the sigma-character, on the basis of the previous and comprehensive studies of the XANES spectroscopy of the adsorbed molecules on the metal surface (McGovern et al. (1989) Handbook on Synchrotoron Radiation, Vol. 2, pp. 467-539). According to our assumption, our XANES results indicated that the pi-character of the Fe-ligand bond increases in the order of Mb, HRP and P-450cam, and that the pi-electron of the thiolate S- in P-450cam is donated to the Fe-O-O moiety, most probably to the antibonding pi* orbital of O2. Such an interpretation is consistent with the experimental findings or data accumulated so far by other methods, such as the resonance Raman spectroscopy.
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Affiliation(s)
- Y Shiro
- Institute of Physical and Chemical Research (RIKEN), Saitama, Japan
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14
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Zentz C, el Antri S, Pin S, Cortes R, Massat A, Simon M, Alpert B. Alteration of heme axial ligands in hemoglobin by organic solvents analyzed by CD, FTIR, and XANES techniques. Biochemistry 1991; 30:2804-10. [PMID: 2007118 DOI: 10.1021/bi00225a010] [Citation(s) in RCA: 5] [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
The effects of mixed solvents on the ligand binding site in hemoglobin have been investigated though three spectroscopic techniques. Two classes of organic solvents (amides and alcohols) known to increase or decrease the hemoglobin affinity have been chosen for this study. The analysis of the iron CO stretching band shows that the ligand binding sites of alpha CO and beta CO subunits inside the alpha 2 beta 2 hemoglobin tetramer exhibit multiple conformations. From the circular dichroism and X-ray absorption near-edge structure data, it appears that no core deformation or heme reorientation occur with the affinity changes. The iron-ligand average bond angle is the sole parameter that depends on the external solvent. Since cosolvents seem to affect the dynamics rather than the hindrance of the heme cavity, we suggest that the protein affinity could be associated with a hierarchy of subtle dynamic states.
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Affiliation(s)
- C Zentz
- Laboratoire de Biologie Physico-Chimique, Université de Paris, France
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15
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Pin S, Le Tilly V, Alpert B, Cortes R. XANES spectroscopy sensitivity to small electronic changes. Case of carp azidomethemoglobin. FEBS Lett 1989; 242:401-4. [PMID: 2914617 DOI: 10.1016/0014-5793(89)80510-1] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
Abstract
Spin states equilibrium of hemoglobin-iron varies with external conditions: pH, allosteric effectors, temperature. The small electronic reorganization of the iron caused by the spin state changes has been detected by X-ray absorption near edge structure (XANES) spectroscopy at room temperature. The iron K-edge region which is sensitive to spin state is located in 7110-7130 eV. Here are presented the 100% high spin and 100% low spin XANES spectra of carp azido ferric hemoglobin.
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Affiliation(s)
- S Pin
- Laboratoire de Biologie Physico-Chimique, Université Paris VII, France
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16
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Congiu-Castellano A, Bianconi A, Dell'Ariccia M, Della Longa S, Giovannelli A, Burattini E, Castagnola M. Oxygen bonding in human hemoglobin and its isolated subunits: a XANES study. Biochem Biophys Res Commun 1987; 147:31-8. [PMID: 2443133 DOI: 10.1016/s0006-291x(87)80083-9] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Abstract
The X-ray absorption near edge structure (XANES) spectra of the human adult and foetal hemoglobin, of the isolated alpha and beta chains, in the oxygenated forms, and of the oxymyoglobin and carp oxyhemoglobin have been measured at the wiggler beam line of the Frascati Synchrotron radiation facility. The bonding angle of oxygen molecule at the iron site in these hemoproteins in solution, has been measured using the multiple scattering theory for data analysis.
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18
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Pin S, Cortes R, Alpert B. XANES spectroscopy of carp hemoglobin-iron in correlation with the affinity changes of the protein for ligand. FEBS Lett 1986; 208:325-30. [PMID: 3780971 DOI: 10.1016/0014-5793(86)81043-2] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
Abstract
The strong variation of ligand-binding properties with pH for carp hemoglobin is not reflected in the electronic distribution of the heme-iron. Thus, we can suppose that hemoglobin affinity is directly controlled by the protein and by some particular changes of the iron atom.
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19
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Pin S, Valat P, Cortes R, Michalowicz A, Alpert B. Ligand binding processes in hemoglobin. Chemical reactivity of iron studied by XANES spectroscopy. Biophys J 1985; 48:997-1001. [PMID: 4092074 PMCID: PMC1329432 DOI: 10.1016/s0006-3495(85)83862-5] [Citation(s) in RCA: 18] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023] Open
Abstract
K-absorption edge of coordinated ions exhibits a fine structure (through the use of XANES, or x-ray absorption near edge structures) that reflects the electronic repartition and the chemical reactivity of these ions. Comparative analysis of iron K-absorption-edge shape for hemoglobin derivatives with different ligand affinity suggests strongly that in hemoglobin, iron-forms with high and low affinity are highly improbable.
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20
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Bianconi A, Congiu-Castellano A, Dell'Ariccia M, Giovannelli A, Burattini E, Castagnola M, Durham PJ. Changes in Fe site structure from fetal to adult hemoglobin probed by XANES. BIOCHIMICA ET BIOPHYSICA ACTA 1985; 831:120-4. [PMID: 2412587 DOI: 10.1016/0167-4838(85)90158-x] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Abstract
Iron X-ray absorption near edge structure (XANES) spectra of human fetal (F) and adult (A) deoxyhemoglobin (deoxyHb) measured at the Frascati synchrotron radiation facility reveal the different geometrical structure of the Fe-porphyrin complexes in the two proteins. By this method, having determined for the first time the variation of atomic positions in fetal and adult hemoglobin in solution (close to the 'in vivo' situation), we give further insight into the structure-function relationship in hemoglobins.
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21
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Bianconi A, Congiu-Castellano A, Dell'Ariccia M, Giovannelli A, Burattini E, Durham PJ. Increase of the Fe effective charge in hemoproteins during oxygenation process. Biochem Biophys Res Commun 1985; 131:98-102. [PMID: 4038310 DOI: 10.1016/0006-291x(85)91775-9] [Citation(s) in RCA: 23] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Abstract
The x-ray absorption near edge structure (XANES) spectra of hemoglobin and myoglobin have been measured at the wiggler beam line of the Frascati Synchrotron Radiation Facility. The energy shifts of the iron absorption jump edge and the chemical shifts of the bound excited state at threshold of 1s core excitations, going from deoxygenated to oxygenated form, are interpreted as evidence of some increase of the positive effective charge on the iron atom upon oxygenation.
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Bianconi A, Congiu-Castellano A, Dell'Ariccia M, Giovannelli A, Durham PJ, Burattini E, Barteri M. XANES study of iron displacement in the haem of myoglobin. FEBS Lett 1984; 178:165-70. [PMID: 6500058 DOI: 10.1016/0014-5793(84)81263-6] [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: 01/20/2023]
Abstract
The XANES (X-ray absorption near edge structure) spectra of deoxy human adult haemoglobin (HbA) and myoglobin (Mb) have been measured at the wiggler beam line of the Frascati synchrotron radiation facility. The XANES are interpreted by the multiple scattering cluster theory. The variations in the XANES between HbA and Mb are assigned to changes in the Fe-porphyrin geometry.
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