1
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Zhang L, Brown MC, Mutter AC, Greenland KN, Cooley JW, Koder RL. Protein dynamics govern the oxyferrous state lifetime of an artificial oxygen transport protein. Biophys J 2023; 122:4440-4450. [PMID: 37865818 PMCID: PMC10698322 DOI: 10.1016/j.bpj.2023.10.022] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/09/2023] [Revised: 09/26/2023] [Accepted: 10/19/2023] [Indexed: 10/23/2023] Open
Abstract
It has long been known that the alteration of protein side chains that occlude or expose the heme cofactor to water can greatly affect the stability of the oxyferrous heme state. Here, we demonstrate that the rate of dynamically driven water penetration into the core of an artificial oxygen transport protein also correlates with oxyferrous state lifetime by reducing global dynamics, without altering the structure of the active site, via the simple linking of the two monomers in a homodimeric artificial oxygen transport protein using a glycine-rich loop. The tethering of these two helices does not significantly affect the active site structure, pentacoordinate heme-binding affinity, reduction potential, or gaseous ligand affinity. It does, however, significantly reduce the hydration of the protein core, as demonstrated by resonance Raman spectroscopy, backbone amide hydrogen exchange, and pKa shifts in buried histidine side chains. This further destabilizes the charge-buried entatic state and nearly triples the oxyferrous state lifetime. These data are the first direct evidence that dynamically driven water penetration is a rate-limiting step in the oxidation of these complexes. It furthermore demonstrates that structural rigidity that limits water penetration is a critical design feature in metalloenzyme construction and provides an explanation for both the failures and successes of earlier attempts to create oxygen-binding proteins.
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Affiliation(s)
- Lei Zhang
- Department of Physics, The City College of New York, New York, New York
| | - Mia C Brown
- Department of Chemistry, University of Missouri, Columbia, Missouri
| | - Andrew C Mutter
- Department of Biochemistry, The City College of New York, New York, New York
| | - Kelly N Greenland
- Department of Physics, The City College of New York, New York, New York
| | - Jason W Cooley
- Department of Chemistry, University of Missouri, Columbia, Missouri
| | - Ronald L Koder
- Department of Physics, The City College of New York, New York, New York; Graduate Programs of Physics, Biology, Chemistry and Biochemistry, The Graduate Center of CUNY, New York, New York.
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2
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Noguchi M, Mao Q, Nakagami A, Kitagishi H. Spontaneous reduction of iron(III)porphyrin to iron(II)porphyrin-CO complex in mouse circulation. Chem Commun (Camb) 2023; 59:6211-6214. [PMID: 37129063 DOI: 10.1039/d3cc00420a] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/03/2023]
Abstract
Iron(II/III)porphyrin/cyclodextrin inclusion complexes serve as hemoprotein models in vivo. Here we showed the iron(III)porphyrin complex to be spontaneously reduced to its iron(II) state in mouse circulation. The reduced complex bound endogenous CO from carboxyhemoglobin, which was followed by urinary excretion. The natural reduction system was found to be effective for synthetic heme-model compounds.
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Affiliation(s)
- Masataka Noguchi
- Department of Molecular Chemistry and Biochemistry, Faculty of Science and Engineering, Doshisha University, Kyotanabe, Kyoto 610-0321, Japan.
| | - Qiyue Mao
- Department of Molecular Chemistry and Biochemistry, Faculty of Science and Engineering, Doshisha University, Kyotanabe, Kyoto 610-0321, Japan.
| | - Atsuki Nakagami
- Department of Molecular Chemistry and Biochemistry, Faculty of Science and Engineering, Doshisha University, Kyotanabe, Kyoto 610-0321, Japan.
| | - Hiroaki Kitagishi
- Department of Molecular Chemistry and Biochemistry, Faculty of Science and Engineering, Doshisha University, Kyotanabe, Kyoto 610-0321, Japan.
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3
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Hosseini FS, Abedini AA, Chen F, Whitfield T, Ude CC, Laurencin CT. Oxygen-Generating Biomaterials for Translational Bone Regenerative Engineering. ACS APPLIED MATERIALS & INTERFACES 2023; 15:50721-50741. [PMID: 36988393 DOI: 10.1021/acsami.2c20715] [Citation(s) in RCA: 6] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/19/2023]
Abstract
Successful regeneration of critical-size defects remains one of the significant challenges in regenerative engineering. These large-scale bone defects are difficult to regenerate and are often reconstructed with matrices that do not provide adequate oxygen levels to stem cells involved in the regeneration process. Hypoxia-induced necrosis predominantly occurs in the center of large matrices since the host tissue's local vasculature fails to provide sufficient nutrients and oxygen. Indeed, utilizing oxygen-generating materials can overcome the central hypoxic region, induce tissue in-growth, and increase the quality of life for patients with extensive tissue damage. This article reviews recent advances in oxygen-generating biomaterials for translational bone regenerative engineering. We discussed different oxygen-releasing and delivery methods, fabrication methods for oxygen-releasing matrices, biology, oxygen's role in bone regeneration, and emerging new oxygen delivery methods that could potentially be used for bone regenerative engineering.
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Affiliation(s)
- Fatemeh S Hosseini
- Connecticut Convergence Institute for Translation in Regenerative Engineering, UConn Health, Farmington, Connecticut 06030, United States
- Raymond and Beverly Sackler Center for Biomedical, Biological, Physical and Engineering Sciences, UConn Health, Farmington, Connecticut 06030, United States
- Department of Skeletal Biology and Regeneration, UConn Health, Farmington, Connecticut 06030, United States
- Department of Orthopedic Surgery, UConn Health, Farmington, Connecticut 06030, United States
| | - Amir Abbas Abedini
- Connecticut Convergence Institute for Translation in Regenerative Engineering, UConn Health, Farmington, Connecticut 06030, United States
- Raymond and Beverly Sackler Center for Biomedical, Biological, Physical and Engineering Sciences, UConn Health, Farmington, Connecticut 06030, United States
- Department of Materials Science and Engineering, University of Connecticut, Storrs, Connecticut 06269, United States
| | - Feiyang Chen
- Connecticut Convergence Institute for Translation in Regenerative Engineering, UConn Health, Farmington, Connecticut 06030, United States
| | - Taraje Whitfield
- Connecticut Convergence Institute for Translation in Regenerative Engineering, UConn Health, Farmington, Connecticut 06030, United States
- Raymond and Beverly Sackler Center for Biomedical, Biological, Physical and Engineering Sciences, UConn Health, Farmington, Connecticut 06030, United States
- Department of Skeletal Biology and Regeneration, UConn Health, Farmington, Connecticut 06030, United States
| | - Chinedu C Ude
- Connecticut Convergence Institute for Translation in Regenerative Engineering, UConn Health, Farmington, Connecticut 06030, United States
- Raymond and Beverly Sackler Center for Biomedical, Biological, Physical and Engineering Sciences, UConn Health, Farmington, Connecticut 06030, United States
- Department of Orthopedic Surgery, UConn Health, Farmington, Connecticut 06030, United States
| | - Cato T Laurencin
- Connecticut Convergence Institute for Translation in Regenerative Engineering, UConn Health, Farmington, Connecticut 06030, United States
- Raymond and Beverly Sackler Center for Biomedical, Biological, Physical and Engineering Sciences, UConn Health, Farmington, Connecticut 06030, United States
- Department of Skeletal Biology and Regeneration, UConn Health, Farmington, Connecticut 06030, United States
- Department of Orthopedic Surgery, UConn Health, Farmington, Connecticut 06030, United States
- Department of Biomedical Engineering, University of Connecticut, Storrs, Connecticut 06269, United States
- Department of Chemical and Bimolecular Engineering, University of Connecticut, Storrs, Connecticut 06269, United States
- Department of Materials Science and Engineering, University of Connecticut, Storrs, Connecticut 06269, United States
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4
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Effect of Different Genotypes and Harvest Times of Sage (Salvia spp. Labiatae) on Lipid Oxidation of Cooked Meat. Antioxidants (Basel) 2023; 12:antiox12030616. [PMID: 36978863 PMCID: PMC10045671 DOI: 10.3390/antiox12030616] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/29/2022] [Revised: 02/20/2023] [Accepted: 02/28/2023] [Indexed: 03/06/2023] Open
Abstract
Lipid oxidation is the primary non-microbial reason for quality deterioration of meat and meat products. Lipid oxidation can be prevented or delayed by antioxidants. In this study, 15 sage (Salvia spp. Labiatae) extracts (five genotypes, three harvest times) were tested for their ability to reduce lipid oxidation (peroxide value (PV) and thiobarbituric acid reactive substances (TBARS)) in ground, uncured, cooked porcine and bovine meat (60%/40% mixture) during 14 days of refrigerated storage. Additionally, total phenolic content was determined, and the antioxidant capacity of the extracts was measured as radical scavenging activity (2,2-diphenyl-1-picrylhydrazyl assay), reducing power, and superoxide anion scavenging activity. All 15 sage extracts were able to reduce lipid oxidation, though showing expected differences depending on genotype and harvest time. The extracts of S. officinalis accession from Foggia, Italy performed better than the other genotypes when looking at the entire storage period and considering both PV and TBARS. Of the applied methods for determining antioxidant capacity, superoxide anion scavenging activity proved to be the best determinant of the ability of sage to reduce lipid oxidation in the meat sample.
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5
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Wu H, Bak KH, Goran GV, Tatiyaborworntham N. Inhibitory mechanisms of polyphenols on heme protein-mediated lipid oxidation in muscle food: New insights and advances. Crit Rev Food Sci Nutr 2022; 64:4921-4939. [PMID: 36448306 DOI: 10.1080/10408398.2022.2146654] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/05/2022]
Abstract
Lipid oxidation is a major cause of quality deterioration that decreases the shelf-life of muscle-based foods (red meat, poultry, and fish), in which heme proteins, particularly hemoglobin and myoglobin, are the primary pro-oxidants. Due to increasing consumer concerns over synthetic chemicals, extensive research has been carried out on natural antioxidants, especially plant polyphenols. The conventional opinion suggests that polyphenols inhibit lipid oxidation of muscle foods primarily owing to their strong hydrogen-donating and transition metal-chelating activities. Recent developments in analytical techniques (e.g., protein crystallography, nuclear magnetic resonance spectroscopy, fluorescence anisotropy, and molecular docking simulation) allow deeper understanding of the molecular interaction of polyphenols with heme proteins, phospholipid membrane, reactive oxygen species, and reactive carbonyl species; hence, novel hypotheses regarding their antioxidant mechanisms have been formulated. In this review, we summarize five direct and three indirect pathways by which polyphenols inhibit heme protein-mediated lipid oxidation in muscle foods. We also discuss the relation between chemical structures and functions of polyphenols as antioxidants.
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Affiliation(s)
- Haizhou Wu
- Department of Biology and Biological Engineering-Food and Nutrition Science, Chalmers University of Technology, Gothenburg, SE, Sweden
| | - Kathrine H Bak
- Department of Food Technology and Vetefrinary Public Health, Institute of Food Safety, University of Veterinary Medicine Vienna, Vienna, Austria
| | - Gheorghe V Goran
- Sciences and Veterinary Medicine of Bucharest, Faculty of Veterinary Medicine, University of Agricultural, Bucharest, Romania
| | - Nantawat Tatiyaborworntham
- Food Biotechnology Research Team, National Center for Genetic Engineering and Biotechnology (BIOTEC), Pathum Thani, Thailand
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6
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Koebke KJ, Pinter TBJ, Pitts WC, Pecoraro VL. Catalysis and Electron Transfer in De Novo Designed Metalloproteins. Chem Rev 2022; 122:12046-12109. [PMID: 35763791 PMCID: PMC10735231 DOI: 10.1021/acs.chemrev.1c01025] [Citation(s) in RCA: 23] [Impact Index Per Article: 11.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
One of the hallmark advances in our understanding of metalloprotein function is showcased in our ability to design new, non-native, catalytically active protein scaffolds. This review highlights progress and milestone achievements in the field of de novo metalloprotein design focused on reports from the past decade with special emphasis on de novo designs couched within common subfields of bioinorganic study: heme binding proteins, monometal- and dimetal-containing catalytic sites, and metal-containing electron transfer sites. Within each subfield, we highlight several of what we have identified as significant and important contributions to either our understanding of that subfield or de novo metalloprotein design as a discipline. These reports are placed in context both historically and scientifically. General suggestions for future directions that we feel will be important to advance our understanding or accelerate discovery are discussed.
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Affiliation(s)
- Karl J. Koebke
- Department of Chemistry, University of Michigan Ann Arbor, MI 48109 USA
| | | | - Winston C. Pitts
- Department of Chemistry, University of Michigan Ann Arbor, MI 48109 USA
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7
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Yamagishi Y, Nagasawa S, Iwase H, Ogra Y. Evaluation of Post-Mortem Interaction between Hemoglobin and Oxime-Type Carbamate Pesticides. Chem Res Toxicol 2022; 35:1110-1116. [PMID: 35559618 DOI: 10.1021/acs.chemrestox.2c00092] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Oxime-type carbamate pesticides having an oxime moiety such as aldicarb, butocarboxim, methomyl, oxamyl, and thiofanox are widely used and have been detected in many fatal cases of accidental exposure or suicide. In forensic toxicology, the accurate determination of blood pesticide concentration is obligatory to prove death by oxime-type carbamate pesticide poisoning. However, the fatal pesticide concentration in blood at autopsy differs from that at the time of death. In this study, we found that oxime-type carbamate pesticides were decomposed by Hb in a temperature-dependent fashion. The mechanism underlying methomyl, aldicarb, oxamyl, and thiofanox decomposition involves the formation of adducts with the amino acids in Hb. With regard to butocarboxim, its decomposition involves the oxidation of the free form and the formation of adducts with the amino acids in Hb. The mass spectra obtained by liquid chromatography quadrupole time-of-flight mass spectrometry revealed that carbamylated amino acid adducts such as Wcar-adduct and Vcar-adduct were formed in Hb solution incubated with methomyl, aldicarb, oxamyl, and thiofanox, whereas alkylated amino acid adducts such as Walkyl-adduct were formed in Hb solution incubated with butocarboxim. These results indicate that aldicarb, butocarboxim, methomyl, oxamyl, and thiofanox are post-mortem changed by Hb.
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Affiliation(s)
- Yoshikazu Yamagishi
- Department of Legal Medicine, Graduate School of Medicine, Chiba University, Chuo, Chiba 260-8670, Japan
| | - Sayaka Nagasawa
- Department of Legal Medicine, Graduate School of Medicine, Chiba University, Chuo, Chiba 260-8670, Japan.,Laboratory of Forensic Toxicology, Graduate School of Pharmaceutical Sciences, Chiba University, Chuo, Chiba 260-8675, Japan
| | - Hirotaro Iwase
- Department of Legal Medicine, Graduate School of Medicine, Chiba University, Chuo, Chiba 260-8670, Japan.,Department of Forensic Medicine, Graduate School of Medicine, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8654, Japan
| | - Yasumitsu Ogra
- Department of Legal Medicine, Graduate School of Medicine, Chiba University, Chuo, Chiba 260-8670, Japan.,Laboratory of Forensic Toxicology, Graduate School of Pharmaceutical Sciences, Chiba University, Chuo, Chiba 260-8675, Japan.,Laboratory of Toxicology and Environmental Health, Graduate School of Pharmaceutical Sciences, Chiba University, Chuo, Chiba 260-8675, Japan
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8
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Rath H, Halder N, Narayanasamy R, Usharani D. Chemical transformation of Doubly N-Confused Porphodimethene to variants of (anti)Aromatic Doubly N-Confused Porphyrinoids and σ aromatic Doubly N-Confused Isophlorinoid. Org Chem Front 2022. [DOI: 10.1039/d2qo00160h] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Chemical conversion of non-aromatic trans-doubly N-confused porphodimethene to hitherto unknown variants of doubly N-confused porphyrinoids/isophlorinoid have been unravelled by precise interplay between the types of oxidants, the types of meso-aryl...
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9
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Singh A, Mittal A, Benjakul S. Undesirable discoloration in edible fish muscle: Impact of indigenous pigments, chemical reactions, processing, and its prevention. Compr Rev Food Sci Food Saf 2021; 21:580-603. [PMID: 34859577 DOI: 10.1111/1541-4337.12866] [Citation(s) in RCA: 19] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/18/2021] [Revised: 10/06/2021] [Accepted: 10/17/2021] [Indexed: 12/17/2022]
Abstract
Fish is rich in proteins and lipids, especially those containing polyunsaturated fatty acids, which made them vulnerable to chemical or microbial changes associated with quality loss. Meat color is one of vital criteria indicating the freshness, quality, and acceptability of the meat. Color of meat is governed by the presence of various pigments such as hemoglobin, myoglobin (Mb), and so on. Mb, particularly oxy-form, is responsible for the bright red color of fish muscle, especially tuna, and dark fleshed fish, while astaxanthin (AXT) directly determines the color of salmonids muscle. Microbial spoilage and chemical changes such as oxidation of lipid/proteins result in the autoxidation of Mb or fading of AXT, leading to undesirable color with lower acceptability. The discoloration has been affected by chemical composition, post-harvesting handling or storage, processing, cooking, and so on . To tackle discoloration of fish meat, vacuum or modified atmospheric packaging, low- or ultralow-temperature storage, uses of artificial and natural additives have been employed. This review article provides information regarding the factors affecting color and other quality aspects of fish muscle. Moreover, promising methodologies used to control discoloration are also focused.
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Affiliation(s)
- Avtar Singh
- International Center of Excellence in Seafood Science and Innovation, Faculty of Agro-Industry, Prince of Songkla University, Hat Yai, Songkhla, Thailand
| | - Ajay Mittal
- International Center of Excellence in Seafood Science and Innovation, Faculty of Agro-Industry, Prince of Songkla University, Hat Yai, Songkhla, Thailand
| | - Soottawat Benjakul
- International Center of Excellence in Seafood Science and Innovation, Faculty of Agro-Industry, Prince of Songkla University, Hat Yai, Songkhla, Thailand
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10
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Heo CE, Kim M, Son MK, Hyun DG, Heo SW, Kim HI. Ion Mobility Mass Spectrometry Analysis of Oxygen Affinity-Associated Structural Changes in Hemoglobin. JOURNAL OF THE AMERICAN SOCIETY FOR MASS SPECTROMETRY 2021; 32:2528-2535. [PMID: 34463503 DOI: 10.1021/jasms.1c00161] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/13/2023]
Abstract
Hemoglobin (Hb) is a major oxygen-transporting protein with allosteric properties reflected in the structural changes that accompany binding of O2. Glycated hemoglobin (GHb), which is a minor component of human red cell hemolysate, is generated by a nonenzymatic reaction between glucose and hemoglobin. Due to the long lifetime of human erythrocytes (∼120 days), GHb is widely used as a reliable biomarker for monitoring long-term glucose control in diabetic patients. Although the structure of GHb differs from that of Hb, structural changes relating to the oxygen affinity of these proteins remain incompletely understood. In this study, the oxygen-binding kinetics of Hb and GHb are evaluated, and their structural dynamics are investigated using solution small-angle X-ray scattering (SAXS), electrospray ionization mass spectrometry equipped with ion mobility spectrometry (ESI-IM-MS), and molecular dynamic (MD) simulations to understand the impact of structural alteration on their oxygen-binding properties. Our results show that the oxygen-binding kinetics of GHb are diminished relative to those of Hb. ESI-IM-MS reveals structural differences between Hb and GHb, which indicate the preference of GHb for a more compact structure in the gas phase relative to Hb. MD simulations also reveal an enhancement of intramolecular interactions upon glycation of Hb. Therefore, the more rigid structure of GHb makes the conformational changes that facilitate oxygen capture more difficult creating a delay in the oxygen-binding process. Our multiple biophysical approaches provide a better understanding of the allosteric properties of hemoglobin that are reflected in the structural alterations accompanying oxygen binding.
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Affiliation(s)
- Chae Eun Heo
- Department of Chemistry, Korea University, Seoul 02841, Republic of Korea
- Center for Proteogenome Research, Korea University, Seoul 02841, Republic of Korea
| | - Minji Kim
- Department of Chemistry, Korea University, Seoul 02841, Republic of Korea
- Center for Proteogenome Research, Korea University, Seoul 02841, Republic of Korea
| | - Myung Kook Son
- Department of Chemistry, Korea University, Seoul 02841, Republic of Korea
- Center for Proteogenome Research, Korea University, Seoul 02841, Republic of Korea
| | - Da Gyeong Hyun
- Department of Chemistry, Korea University, Seoul 02841, Republic of Korea
- Center for Proteogenome Research, Korea University, Seoul 02841, Republic of Korea
| | - Sung Woo Heo
- Inorganic Metrology Group, Division of Chemical and Biological Metrology, Korea Research Institute of Standards and Science (KRISS), Daejeon 34113, Republic of Korea
| | - Hugh I Kim
- Department of Chemistry, Korea University, Seoul 02841, Republic of Korea
- Center for Proteogenome Research, Korea University, Seoul 02841, Republic of Korea
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11
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Mao Q, Das PK, Le Gac S, Boitrel B, Dorcet V, Oohora K, Hayashi T, Kitagishi H. Functional Myoglobin Model Composed of a Strapped Porphyrin/Cyclodextrin Supramolecular Complex with an Overhanging COOH That Increases O 2/CO Binding Selectivity in Aqueous Solution. Inorg Chem 2021; 60:12392-12404. [PMID: 34319113 DOI: 10.1021/acs.inorgchem.1c01628] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
A water-soluble strapped iron(III)tetraarylporphyrin (FeIIIPor-1) bearing two propylpyridinium groups at the side chains and a carboxylic acid group at the overhanging position of the strap was synthesized to mimic the function of myoglobin with the distal polar functionality in aqueous solution. FeIIIPor-1 forms a stable 1:1 inclusion complex with a per-O-methylated β-cyclodextrin dimer having a pyridine linker (Py3OCD), providing a hydrophobic environment and a proximal fifth ligand to stabilize the O2-complex. The ferrous complex (FeIIPorCD-1) binds both O2 and CO in aqueous solution. The O2 and CO binding affinities (P1/2O2 and P1/2CO) and half-life time (t1/2) of the O2 complex of FeIIPorCD-1 are 6.3 and 0.021 Torr, and 7 h, respectively, at pH 7 and 25 °C. The control compound without the strap structure (FeIIPorCD-2) has similar oxygen binding characteristics (P1/2O2 = 8.0 Torr), but much higher CO binding affinity (P1/2CO = 3.8 × 10-4 Torr), and longer t1/2 (30 h). The O2 and CO kinetics indicate that the strapped structure in FeIIPorCD-1 inhibits the entrance of these gaseous ligands into the iron(II) center, as evidenced by lower konO2 and konCO values. Interestingly, the CO complex of FeIIPorCD-1 is significantly destabilized (relatively larger koffCO), while the koffO2 value is much smaller than that of FeIIPorCD-2, resulting in significantly increased O2/CO selectivity (reduced M value, where M = P1/2O2/P1/2CO = 320) in FeIIPorCD-1 compared to FeIIPorCD-2 (M = 21000).
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Affiliation(s)
- Qiyue Mao
- Department of Molecular Chemistry and Biochemistry, Faculty of Science and Engineering, Doshisha University, Kyotanabe-city, Kyoto 610-0321, Japan
| | - Pradip K Das
- Institut des Sciences Chimiques de Rennes, Université Rennes, CNRS, UMR 6226, Rennes F-35000, France
| | - Stéphane Le Gac
- Institut des Sciences Chimiques de Rennes, Université Rennes, CNRS, UMR 6226, Rennes F-35000, France
| | - Bernard Boitrel
- Institut des Sciences Chimiques de Rennes, Université Rennes, CNRS, UMR 6226, Rennes F-35000, France
| | - Vincent Dorcet
- Institut des Sciences Chimiques de Rennes, Université Rennes, CNRS, UMR 6226, Rennes F-35000, France
| | - Koji Oohora
- Department of Applied Chemistry, Graduate School of Engineering, Osaka University, 2-1 Yamadaoka, Suita 565-0871, Japan
| | - Takashi Hayashi
- Department of Applied Chemistry, Graduate School of Engineering, Osaka University, 2-1 Yamadaoka, Suita 565-0871, Japan
| | - Hiroaki Kitagishi
- Department of Molecular Chemistry and Biochemistry, Faculty of Science and Engineering, Doshisha University, Kyotanabe-city, Kyoto 610-0321, Japan
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12
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Mondal P, Ishigami I, Gérard EF, Lim C, Yeh SR, de Visser SP, Wijeratne GB. Proton-coupled electron transfer reactivities of electronically divergent heme superoxide intermediates: a kinetic, thermodynamic, and theoretical study. Chem Sci 2021; 12:8872-8883. [PMID: 34257888 PMCID: PMC8246096 DOI: 10.1039/d1sc01952j] [Citation(s) in RCA: 13] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/08/2021] [Accepted: 05/26/2021] [Indexed: 01/11/2023] Open
Abstract
Heme superoxides are one of the most versatile metallo-intermediates in biology, and they mediate a vast variety of oxidation and oxygenation reactions involving O2(g). Overall proton-coupled electron transfer (PCET) processes they facilitate may proceed via several different mechanistic pathways, attributes of which are not yet fully understood. Herein we present a detailed investigation into concerted PCET events of a series of geometrically similar, but electronically disparate synthetic heme superoxide mimics, where unprecedented, PCET feasibility-determining electronic effects of the heme center have been identified. These electronic factors firmly modulate both thermodynamic and kinetic parameters that are central to PCET, as supported by our experimental and theoretical observations. Consistently, the most electron-deficient superoxide adduct shows the strongest driving force for PCET, whereas the most electron-rich system remains unreactive. The pivotal role of these findings in understanding significant heme systems in biology, as well as in alternative energy applications is also discussed.
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Affiliation(s)
- Pritam Mondal
- Department of Chemistry, University of Alabama at Birmingham Birmingham AL 35205 USA
| | - Izumi Ishigami
- Department of Physiology and Biophysics, Albert Einstein College of Medicine The Bronx New York 10461 USA
| | - Emilie F Gérard
- Manchester Institute of Biotechnology, Department of Chemical Engineering and Analytical Science, The University of Manchester 131 Princess Street Manchester M1 7DN UK
| | - Chaeeun Lim
- Department of Chemistry, University of Alabama at Birmingham Birmingham AL 35205 USA
| | - Syun-Ru Yeh
- Department of Physiology and Biophysics, Albert Einstein College of Medicine The Bronx New York 10461 USA
| | - Sam P de Visser
- Manchester Institute of Biotechnology, Department of Chemical Engineering and Analytical Science, The University of Manchester 131 Princess Street Manchester M1 7DN UK
| | - Gayan B Wijeratne
- Department of Chemistry, University of Alabama at Birmingham Birmingham AL 35205 USA
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13
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14
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Kaur S, Shiekh BA, Kaur D, Kaur I. Highly sensitive sensing of Fe(III) harnessing Schiff based ionophore: An electrochemical approach supported with spectroscopic and DFT studies. J Mol Liq 2021. [DOI: 10.1016/j.molliq.2021.115954] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
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15
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Tomioka D, Nakatsuji H, Miyagawa S, Sawa Y, Matsusaki M. Development of temperature dependent oxygen releasable nanofilm by modulating oxidation state of myoglobin. Chem Commun (Camb) 2021; 57:5131-5134. [PMID: 33988188 DOI: 10.1039/d1cc01545a] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Controlled release of oxygen from myoglobin was achieved by modulating autoxidation of oxymyoglobin using ascorbic acid as a reductant by temperature variation. Long-term storage, prompt release and re-storage of oxygen were also available with this system. Furthermore, 20 nm thick nanofilms composed of oxymyoglobin and type I collagen containing ascorbic acid could successfully show autoxidation of oxymyoglobin in response to environmental temperature. The ultrathin nanofilms will be useful as oxygen-controlled releasable scaffolds for tissue engineering application.
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Affiliation(s)
- Daisuke Tomioka
- Department of Applied Chemistry, Graduate School of Engineering, Osaka University, 2-1 Yamadaoka, Suita, Osaka 565-0871, Japan.
| | - Hirotaka Nakatsuji
- Joint Research Laboratory (TOPPAN) for Advanced Cell Regulatory Chemistry, Graduate School of Engineering, Osaka University, 2-1 Yamadaoka, Suita, Osaka 565-0871, Japan
| | - Shigeru Miyagawa
- Department of Cardiovascular Surgery, Osaka University Graduate School of Medicine, 2-2 Yamadaoka, Suita, Osaka 565-0871, Japan
| | - Yoshiki Sawa
- Department of Cardiovascular Surgery, Osaka University Graduate School of Medicine, 2-2 Yamadaoka, Suita, Osaka 565-0871, Japan
| | - Michiya Matsusaki
- Department of Applied Chemistry, Graduate School of Engineering, Osaka University, 2-1 Yamadaoka, Suita, Osaka 565-0871, Japan. and Joint Research Laboratory (TOPPAN) for Advanced Cell Regulatory Chemistry, Graduate School of Engineering, Osaka University, 2-1 Yamadaoka, Suita, Osaka 565-0871, Japan
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16
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Sakai H, Kobayashi N, Kure T, Okuda C. Translational research of hemoglobin vesicles as a transfusion alternative. Curr Med Chem 2021; 29:591-606. [PMID: 33845721 DOI: 10.2174/0929867328666210412130035] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/26/2020] [Revised: 01/24/2021] [Accepted: 01/26/2021] [Indexed: 11/22/2022]
Abstract
Clinical situations arise in which blood for transfusion becomes scarce or unavailable. Considerable demand for a transfusion alternative persists because of various difficulties posed by blood donation and transfusion systems. Hemoglobin-vesicles (HbV) are artificial oxygen carriers being developed for use as a transfusion alternative. Just as biomembranes of red blood cells (RBCs) do, phospholipid vesicles (liposomes) for Hb encapsulation can protect the human body from toxic effects of molecular Hb. The main HbV component, Hb, is obtained from discarded human donated blood. Therefore, HbV can be categorized as a biologic agent targeting oxygen for peripheral tissues. The purification procedure strictly eliminates the possibility of viral contamination. It also removes all concomitant unstable enzymes present in RBC for utmost safety from infection. The deoxygenated HbVs, which are storable for over years at ambient temperature, can function as an alternative to blood transfusion for resuscitation from hemorrhagic shock and O2 therapeutics. Moreover, a recent study clarified beneficial effects for anti-oxidation and anti-inflammation by carbon monoxide (CO)-bound HbVs. Autoxidation of HbV (HbO2 → metHb + O2-.) is unavoidable after intravenous administration. Co-injection of methylene blue can extract the intraerythrocytic glycolytic electron energy effectively and reduce metHb. Other phenothiazine dyes can also function as electron mediators to improve the functional life span of HbV. This review paper summarizes recent progress of the research and development of HbV, aimed at clinical applications.
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Affiliation(s)
- Hiromi Sakai
- Department of Chemistry, Nara Medical University, 840 Shijo-cho, Kashihara 634-8521. Japan
| | - Naoko Kobayashi
- Department of Chemistry, Nara Medical University, 840 Shijo-cho, Kashihara 634-8521. Japan
| | - Tomoko Kure
- Department of Chemistry, Nara Medical University, 840 Shijo-cho, Kashihara 634-8521. Japan
| | - Chie Okuda
- Department of Chemistry, Nara Medical University, 840 Shijo-cho, Kashihara 634-8521. Japan
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17
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Mao Q, Kawaguchi AT, Mizobata S, Motterlini R, Foresti R, Kitagishi H. Sensitive quantification of carbon monoxide in vivo reveals a protective role of circulating hemoglobin in CO intoxication. Commun Biol 2021; 4:425. [PMID: 33782534 PMCID: PMC8007703 DOI: 10.1038/s42003-021-01880-1] [Citation(s) in RCA: 25] [Impact Index Per Article: 8.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/22/2020] [Accepted: 02/17/2021] [Indexed: 12/14/2022] Open
Abstract
Carbon monoxide (CO) is a gaseous molecule known as the silent killer. It is widely believed that an increase in blood carboxyhemoglobin (CO-Hb) is the best biomarker to define CO intoxication, while the fact that CO accumulation in tissues is the most likely direct cause of mortality is less investigated. There is no reliable method other than gas chromatography to accurately determine CO content in tissues. Here we report the properties and usage of hemoCD1, a synthetic supramolecular compound composed of an iron(II)porphyrin and a cyclodextrin dimer, as an accessible reagent for a simple colorimetric assay to quantify CO in biological samples. The assay was validated in various organ tissues collected from rats under normal conditions and after exposure to CO. The kinetic profile of CO in blood and tissues after CO treatment suggested that CO accumulation in tissues is prevented by circulating Hb, revealing a protective role of Hb in CO intoxication. Furthermore, hemoCD1 was used in vivo as a CO removal agent, showing that it acts as an effective adjuvant to O2 ventilation to eliminate residual CO accumulated in organs, including the brain. These findings open new therapeutic perspectives to counteract the toxicity associated with CO poisoning. Mao et al. report highly sensitive quantification of carbon monoxide with a simple colorimetric assay, exploiting a synthetic supramolecular compound, hemoCD1. It can reveal distribution of CO in organs including the brain and can also serve as a CO scavenger for residual CO accumulated in organs. Finally, the authors showed circulating hemoglobin plays a protective role in CO intoxication.
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Affiliation(s)
- Qiyue Mao
- Department of Molecular Chemistry and Biochemistry, Faculty of Science and Engineering, Doshisha University, Kyotanabe, Kyoto, Japan
| | - Akira T Kawaguchi
- Cell Transplantation and Regenerative Medicine, Tokai University, Isehara, Kanagawa, Japan
| | - Shun Mizobata
- Department of Molecular Chemistry and Biochemistry, Faculty of Science and Engineering, Doshisha University, Kyotanabe, Kyoto, Japan
| | | | - Roberta Foresti
- University Paris Est Creteil, INSERM, IMRB, Creteil, France.
| | - Hiroaki Kitagishi
- Department of Molecular Chemistry and Biochemistry, Faculty of Science and Engineering, Doshisha University, Kyotanabe, Kyoto, Japan.
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18
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Kitagishi H, Kano K. Synthetic heme protein models that function in aqueous solution. Chem Commun (Camb) 2021; 57:148-173. [DOI: 10.1039/d0cc07044k] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
Abstract
Supramolecular porphyrin–cyclodextrin complexes act as biomimetic heme protein models in aqueous solution.
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Affiliation(s)
- Hiroaki Kitagishi
- Department of Molecular Chemistry and Biochemistry
- Faculty of Science and Engineering
- Doshisha University
- Kyoto 610-0321
- Japan
| | - Koji Kano
- Department of Molecular Chemistry and Biochemistry
- Faculty of Science and Engineering
- Doshisha University
- Kyoto 610-0321
- Japan
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19
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Derry PJ, Vo ATT, Gnanansekaran A, Mitra J, Liopo AV, Hegde ML, Tsai AL, Tour JM, Kent TA. The Chemical Basis of Intracerebral Hemorrhage and Cell Toxicity With Contributions From Eryptosis and Ferroptosis. Front Cell Neurosci 2020; 14:603043. [PMID: 33363457 PMCID: PMC7755086 DOI: 10.3389/fncel.2020.603043] [Citation(s) in RCA: 19] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/04/2020] [Accepted: 10/06/2020] [Indexed: 12/12/2022] Open
Abstract
Intracerebral hemorrhage (ICH) is a particularly devastating event both because of the direct injury from space-occupying blood to the sequelae of the brain exposed to free blood components from which it is normally protected. Not surprisingly, the usual metabolic and energy pathways are overwhelmed in this situation. In this review article, we detail the complexity of red blood cell degradation, the contribution of eryptosis leading to hemoglobin breakdown into its constituents, the participants in that process, and the points at which injury can be propagated such as elaboration of toxic radicals through the metabolism of the breakdown products. Two prominent products of this breakdown sequence, hemin, and iron, induce a variety of pathologies including free radical damage and DNA breakage, which appear to include events independent from typical oxidative DNA injury. As a result of this confluence of damaging elements, multiple pathways of injury, cell death, and survival are likely engaged including ferroptosis (which may be the same as oxytosis but viewed from a different perspective) and senescence, suggesting that targeting any single cause will likely not be a sufficient strategy to maximally improve outcome. Combination therapies in addition to safe methods to reduce blood burden should be pursued.
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Affiliation(s)
- Paul J Derry
- Center for Genomics and Precision Medicine, Department of Translational Medical Sciences, Institute of Biosciences and Technology, College of Medicine, Texas A&M Health Science Center, Houston, TX, United States
| | - Anh Tran Tram Vo
- Center for Genomics and Precision Medicine, Department of Translational Medical Sciences, Institute of Biosciences and Technology, College of Medicine, Texas A&M Health Science Center, Houston, TX, United States
| | - Aswini Gnanansekaran
- Center for Genomics and Precision Medicine, Department of Translational Medical Sciences, Institute of Biosciences and Technology, College of Medicine, Texas A&M Health Science Center, Houston, TX, United States
| | - Joy Mitra
- Department of Neurosurgery, Center for Neuroregeneration, The Houston Methodist Research Institute, Houston, TX, United States
| | - Anton V Liopo
- Center for Genomics and Precision Medicine, Department of Translational Medical Sciences, Institute of Biosciences and Technology, College of Medicine, Texas A&M Health Science Center, Houston, TX, United States
| | - Muralidhar L Hegde
- Department of Neurosurgery, Center for Neuroregeneration, The Houston Methodist Research Institute, Houston, TX, United States
| | - Ah-Lim Tsai
- Division of Hematology, Department of Internal Medicine, McGovern Medical School, University of Texas Health Science Center at Houston, Houston, TX, United States
| | - James M Tour
- Department of Chemistry, Rice University, Houston, TX, United States.,Department of Computer Science, George R. Brown School of Engineering, Rice University, Houston, TX, United States.,Department of Materials Science and NanoEngineering, George R. Brown School of Engineering, Rice University, Houston, TX, United States
| | - Thomas A Kent
- Center for Genomics and Precision Medicine, Department of Translational Medical Sciences, Institute of Biosciences and Technology, College of Medicine, Texas A&M Health Science Center, Houston, TX, United States.,Department of Chemistry, Rice University, Houston, TX, United States.,Stanley H. Appel Department of Neurology, Institute for Academic Medicine, Houston Methodist Hospital, Houston, TX, United States
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20
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Ramanathan R, Suman SP, Faustman C. Biomolecular Interactions Governing Fresh Meat Color in Post-mortem Skeletal Muscle: A Review. JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY 2020; 68:12779-12787. [PMID: 32045229 DOI: 10.1021/acs.jafc.9b08098] [Citation(s) in RCA: 50] [Impact Index Per Article: 12.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
Appearance is an important sensory property that significantly influences consumers' perceptions of fresh meat quality. Failure to meet consumer expectations can lead to rejection of meat products, concomitant loss in value, and potential production of organic waste. Immediately after animal harvest, skeletal muscle metabolism changes from aerobic to anaerobic. However, anoxic post-mortem muscle is biochemically active, and biomolecular interaction between myoglobin, mitochondria, metabolites, and lipid oxidation determines meat color. This review examines how metabolites and mitochondrial activity can influence myoglobin oxygenation and metmyoglobin reducing activity. Further, the review highlights recent research that has examined myoglobin redox dynamics, sarcoplasmic metabolite changes, and/or post-mortem biochemistry.
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Affiliation(s)
- Ranjith Ramanathan
- Department of Animal and Food Sciences, Oklahoma State University, Stillwater, Oklahoma 74078, United States
| | - Surendranath P Suman
- Department of Animal and Food Sciences, University of Kentucky, Lexington, Kentucky 40546, United States
| | - Cameron Faustman
- Department of Animal Science, University of Connecticut, Storrs, Connecticut 06269, United States
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21
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Postnikova GB, Shekhovtsova EA, Sivozhelezov VS. Electrostatic Interaction of Globins with Phospholipid Membranes. Biophysics (Nagoya-shi) 2020. [DOI: 10.1134/s0006350920060172] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
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22
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Das T, Harshey A, Nigam K, Yadav VK, Srivastava A. Analytical approaches for bloodstain aging by vibrational spectroscopy: Current trends and future perspectives. Microchem J 2020. [DOI: 10.1016/j.microc.2020.105278] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
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23
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Marchany-Rivera D, Smith CA, Rodriguez-Perez JD, López-Garriga J. Lucina pectinata oxyhemoglobin (II-III) heterodimer pH susceptibility. J Inorg Biochem 2020; 207:111055. [PMID: 32217352 DOI: 10.1016/j.jinorgbio.2020.111055] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/03/2019] [Revised: 02/27/2020] [Accepted: 03/02/2020] [Indexed: 10/24/2022]
Abstract
Lucina pectinata live in high concentrations of hydrogen sulfide (H2S) and contains one hemoglobin, Hemoglobin I (HbI), transporting H2S and two hemoglobins, Hemoglobin II (HbII) and Hemoglobin (HbIII), transferring dioxygen to symbionts. HbII and HbIII contain B10 tyrosine (Tyr) and E7 glutamine (Gln) in the heme pocket generating an efficient hydrogen bonding network with the (HbII-HbIII)-O2 species, leading to very low ligand dissociation rates. The results indicate that the oxy-hemeprotein is susceptible to pH from 4 to 9, at acidic conditions, and as a function of the potassium ferricyanide concentration, 100% of the met-aquo derivative is produced. Without a strong oxidant, pH 5 generates a small concentration of the met-aquo complex. The process is accelerated by the presence of salts, as indicated by the crystallization structures and UV-Vis spectra. The results suggest that acidic pH generates conformational changes associated with B10 and E7 heme pocket amino acids, weakening the (HbII-HbIII)-O2 hydrogen bond network. The observation is supported by X-ray crystallography, since at pH 4 and 5, the heme-Fe tends to oxidize, while at pH 7, the oxy-heterodimer is present. Conformational changes also are observed at higher pH by the presence of a 605 nm transition associated with the iron heme-Tyr interaction. Therefore, pH is one crucial factor regulating the (HbII-HbIII)-O2 complex hydrogen-bonding network. Thus, it can be proposed that the hydrogen bonding adjustments between the heme bound O2 and the Tyr and Gln amino acids contribute to oxygen dissociation from the (HbII-HbIII)-O2 system.
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Affiliation(s)
- Darya Marchany-Rivera
- Department of Chemistry, P.O. Box 9000, University of Puerto Rico, Mayagüez Campus, 00681, Puerto Rico.
| | - Clyde A Smith
- Stanford Linear Accelerator Center (SLAC) National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, CA 94025, USA.
| | - Josiris D Rodriguez-Perez
- Department of Chemistry, P.O. Box 9000, University of Puerto Rico, Mayagüez Campus, 00681, Puerto Rico.
| | - Juan López-Garriga
- Department of Chemistry, P.O. Box 9000, University of Puerto Rico, Mayagüez Campus, 00681, Puerto Rico.
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24
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Shaine ML, Premasiri WR, Ingraham HM, Andino R, Lemler P, Brodeur AN, Ziegler LD. Surface enhanced Raman scattering for robust, sensitive detection and confirmatory identification of dried bloodstains. Analyst 2020; 145:6097-6110. [DOI: 10.1039/d0an01132k] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
785 nm SERS spectra provide rapid, sensitive confirmatory identification of dried bloodstains due to a ferric, high spin heme moiety.
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Affiliation(s)
- M. L. Shaine
- Program in Biomedical Forensic Sciences
- Boston University School of Medicine
- Boston
- USA
| | - W. R. Premasiri
- Department of Chemistry
- 590 Commonwealth Ave
- Boston University
- Boston
- USA
| | - H. M. Ingraham
- Department of Chemistry
- 590 Commonwealth Ave
- Boston University
- Boston
- USA
| | - R. Andino
- Department of Chemistry
- 590 Commonwealth Ave
- Boston University
- Boston
- USA
| | - P. Lemler
- Department of Chemistry
- 590 Commonwealth Ave
- Boston University
- Boston
- USA
| | - A. N. Brodeur
- Program in Biomedical Forensic Sciences
- Boston University School of Medicine
- Boston
- USA
| | - L. D. Ziegler
- Department of Chemistry
- 590 Commonwealth Ave
- Boston University
- Boston
- USA
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25
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Rodriguez-Mackenzie AD, Arbelo-Lopez HD, Wymore T, Lopez-Garriga J. A reaction pathway to compound 0 intermediates in oxy-myoglobin through interactions with hydrogen sulfide and His64. J Mol Graph Model 2019; 94:107465. [PMID: 31670138 DOI: 10.1016/j.jmgm.2019.107465] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/09/2019] [Revised: 09/25/2019] [Accepted: 10/01/2019] [Indexed: 11/18/2022]
Abstract
Myoglobin (Mb) binds oxygen with high affinity as a low spin singlet complex and thus functions as an oxygen storage protein. Yet, hybrid Density Functional Theory/Molecular Mechanical (DFT/MM) calculations of oxy-Mb models predict that the O2 bond is much less resistant to breaking in the presence of hydrogen sulfide (H2S) compared with water. Specifically, a hydrogen atom from H2S can be transferred to the distal oxygen atom through homolytic cleavage of the S-H bond to form the intermediate Compound (Cpd) 0 structure and a thiyl radical. In the presence of a neutral His64 (Nε protonation, His64-ε) and H2S, only a metastable Cpd 0 would be formed as the active site is devoid of any additional proton donor to fully break the O2 bond. In contrast, the calculations predict that the triplet state is significantly favored over the open shell singlet diradical state throughout the entire reaction coordinate in the presence of H2S and a positively charged His64. Furthermore, a positively charged His64 can readily donate a proton to Cpd 0 to fully break the O2 bond resulting in a configuration analogous to reported reaction models of a hemoglobin mutant bound to H2O2 with H2S present. Typically, exotic techniques are required to generate Cpd 0 but under the conditions just described the intermediate is readily detected in UV-Vis spectra at room temperature. The effect is observed as a 2 nm red shift of the Soret band from 414 nm to 416 nm (pH 5.0, His64-εδ) and from 416 nm to 418 nm (pH 6.6, His64-ε).
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Affiliation(s)
| | - Hector D Arbelo-Lopez
- Department of Chemistry, University of Puerto Rico Mayaguez Campus, Mayaguez, 00680, Puerto Rico
| | - Troy Wymore
- Department of Chemistry, University of Michigan, Ann Arbor, MI, 48109-1055, United States.
| | - Juan Lopez-Garriga
- Department of Chemistry, University of Puerto Rico Mayaguez Campus, Mayaguez, 00680, Puerto Rico.
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26
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Suzuki W, Kotani H, Ishizuka T, Kojima T. Dioxygen/Hydrogen Peroxide Interconversion Using Redox Couples of Saddle-Distorted Porphyrins and Isophlorins. J Am Chem Soc 2019; 141:5987-5994. [PMID: 30882221 DOI: 10.1021/jacs.9b01038] [Citation(s) in RCA: 16] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
Interconversion between dioxygen (O2) and hydrogen peroxide (H2O2) has attracted much interest because of the growing importance of H2O2 as an energy source. There are many reports on O2 conversions to H2O2; however, no example has been reported on O2/H2O2 interconversion. Herein, we describe successful achievement of a reversible O2/H2O2 conversion based on an N21, N23-dimethylated saddle-distorted porphyrin and the corresponding two-electron-reduced porphyrin (isophlorin) for the first time. The isophlorin could react with O2 to afford the corresponding porphyrin and H2O2; conversely, the porphyrin also reacted with excess H2O2 to reproduce the corresponding isophlorin and O2. The isophlorin-O2/porphyrin-H2O2 interconversion was repeatedly proceeded by alternate bubbling of Ar or O2, although no reversible conversion was observed in the case of an N21, N22-dimethylated porphyrin as a structural isomer. Such a drastic change of the reversibility was derived from the directions of inner N H protons in hydrogen-bond formation of the isophlorin core with O2 as well as those of the lone pairs of the inner nitrogen atoms of the porphyrin core to form hydrogen bonds with H2O2. The intriguing isophlorin-O2/porphyrin-H2O2 interconversion was accomplished by introducing methyl groups at the inner nitrogen atoms to minimize the difference of the Gibbs free energy between isophlorin-O2/porphyrin-H2O2 states and the Gibbs activation energy of the interconversion. On the basis of the kinetic and thermodynamic analysis on the isophlorin-O2/porphyrin-H2O2 interconversion using 1H NMR and UV-vis spectroscopies and DFT calculations, we propose the formation of a two-point hydrogen-bonding adduct between the N21, N23-dimethylated porphyrin and H2O2 as an intermediate.
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Affiliation(s)
- Wataru Suzuki
- Department of Chemistry, Faculty of Pure and Applied Sciences , University of Tsukuba and CREST (JST) , 1-1-1 Tennoudai , Tsukuba , Ibaraki 305-8571 , Japan
| | - Hiroaki Kotani
- Department of Chemistry, Faculty of Pure and Applied Sciences , University of Tsukuba and CREST (JST) , 1-1-1 Tennoudai , Tsukuba , Ibaraki 305-8571 , Japan
| | - Tomoya Ishizuka
- Department of Chemistry, Faculty of Pure and Applied Sciences , University of Tsukuba and CREST (JST) , 1-1-1 Tennoudai , Tsukuba , Ibaraki 305-8571 , Japan
| | - Takahiko Kojima
- Department of Chemistry, Faculty of Pure and Applied Sciences , University of Tsukuba and CREST (JST) , 1-1-1 Tennoudai , Tsukuba , Ibaraki 305-8571 , Japan
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27
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Myoglobinopathy is an adult-onset autosomal dominant myopathy with characteristic sarcoplasmic inclusions. Nat Commun 2019; 10:1396. [PMID: 30918256 PMCID: PMC6437160 DOI: 10.1038/s41467-019-09111-2] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/14/2017] [Accepted: 02/14/2019] [Indexed: 11/08/2022] Open
Abstract
Myoglobin, encoded by MB, is a small cytoplasmic globular hemoprotein highly expressed in cardiac myocytes and oxidative skeletal myofibers. Myoglobin binds O2, facilitates its intracellular transport and serves as a controller of nitric oxide and reactive oxygen species. Here, we identify a recurrent c.292C>T (p.His98Tyr) substitution in MB in fourteen members of six European families suffering from an autosomal dominant progressive myopathy with highly characteristic sarcoplasmic inclusions in skeletal and cardiac muscle. Myoglobinopathy manifests in adulthood with proximal and axial weakness that progresses to involve distal muscles and causes respiratory and cardiac failure. Biochemical characterization reveals that the mutant myoglobin has altered O2 binding, exhibits a faster heme dissociation rate and has a lower reduction potential compared to wild-type myoglobin. Preliminary studies show that mutant myoglobin may result in elevated superoxide levels at the cellular level. These data define a recognizable muscle disease associated with MB mutation. Myoglobin is a hemeprotein that reversibly binds oxygen and gives muscle its red color. Here, the authors report a genetic variant in the MB gene that associates with myoglobinopathy, an autosomal dominant progressive myopathy, and altered oxygen binding properties of the mutant protein.
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28
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Lacy DC. Applications of the Marcus cross relation to inner sphere reduction of O 2: implications in small-molecule activation. Inorg Chem Front 2019. [DOI: 10.1039/c9qi00828d] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Abstract
The Marcus cross relation is demonstrated to be applicable to inner sphere electron transfer from iron to molecular oxygen by incorporation of the Fe(iii)–O2to Fe(iii) + superoxide BDFE inKeq. A few case-studies are provided as working examples.
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Affiliation(s)
- David C. Lacy
- Department of Chemistry
- University at Buffalo
- State University of New York
- Buffalo
- USA
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29
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K. Mittal S, Kumar S, Kaur N. Enhanced Performance of CNT‐doped Imine Based Receptors as Fe(III) Sensor Using Potentiometry and Voltammetry. ELECTROANAL 2018. [DOI: 10.1002/elan.201800100] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Susheel K. Mittal
- School of Chemistry and BiochemistryThapar Institute of Engineering and Technology Punjab 147004 India
| | - Sanjeev Kumar
- School of Chemistry and BiochemistryThapar Institute of Engineering and Technology Punjab 147004 India
| | - Navneet Kaur
- Department of ChemistryPanjab University Chandigarh Punjab 160014 India
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30
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Adam SM, Wijeratne GB, Rogler PJ, Diaz DE, Quist DA, Liu JJ, Karlin KD. Synthetic Fe/Cu Complexes: Toward Understanding Heme-Copper Oxidase Structure and Function. Chem Rev 2018; 118:10840-11022. [PMID: 30372042 PMCID: PMC6360144 DOI: 10.1021/acs.chemrev.8b00074] [Citation(s) in RCA: 145] [Impact Index Per Article: 24.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Abstract
Heme-copper oxidases (HCOs) are terminal enzymes on the mitochondrial or bacterial respiratory electron transport chain, which utilize a unique heterobinuclear active site to catalyze the 4H+/4e- reduction of dioxygen to water. This process involves a proton-coupled electron transfer (PCET) from a tyrosine (phenolic) residue and additional redox events coupled to transmembrane proton pumping and ATP synthesis. Given that HCOs are large, complex, membrane-bound enzymes, bioinspired synthetic model chemistry is a promising approach to better understand heme-Cu-mediated dioxygen reduction, including the details of proton and electron movements. This review encompasses important aspects of heme-O2 and copper-O2 (bio)chemistries as they relate to the design and interpretation of small molecule model systems and provides perspectives from fundamental coordination chemistry, which can be applied to the understanding of HCO activity. We focus on recent advancements from studies of heme-Cu models, evaluating experimental and computational results, which highlight important fundamental structure-function relationships. Finally, we provide an outlook for future potential contributions from synthetic inorganic chemistry and discuss their implications with relevance to biological O2-reduction.
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Affiliation(s)
- Suzanne M. Adam
- Department of Chemistry, Johns Hopkins University, Baltimore, Maryland 21218, United States
| | - Gayan B. Wijeratne
- Department of Chemistry, Johns Hopkins University, Baltimore, Maryland 21218, United States
| | - Patrick J. Rogler
- Department of Chemistry, Johns Hopkins University, Baltimore, Maryland 21218, United States
| | - Daniel E. Diaz
- Department of Chemistry, Johns Hopkins University, Baltimore, Maryland 21218, United States
| | - David A. Quist
- Department of Chemistry, Johns Hopkins University, Baltimore, Maryland 21218, United States
| | - Jeffrey J. Liu
- Department of Chemistry, Johns Hopkins University, Baltimore, Maryland 21218, United States
| | - Kenneth D. Karlin
- Department of Chemistry, Johns Hopkins University, Baltimore, Maryland 21218, United States
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31
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Crystal structure of the ferric homotetrameric β 4 human hemoglobin. Biophys Chem 2018; 240:9-14. [DOI: 10.1016/j.bpc.2018.05.003] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/19/2018] [Revised: 05/18/2018] [Accepted: 05/18/2018] [Indexed: 11/21/2022]
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32
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Surendhran R, D'Arpino AA, Sciscent BY, Cannella AF, Friedman AE, MacMillan SN, Gupta R, Lacy DC. Deciphering the mechanism of O 2 reduction with electronically tunable non-heme iron enzyme model complexes. Chem Sci 2018; 9:5773-5780. [PMID: 30079187 PMCID: PMC6050603 DOI: 10.1039/c8sc01621f] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/10/2018] [Accepted: 06/04/2018] [Indexed: 01/08/2023] Open
Abstract
A homologous series of electronically tuned 2,2',2''-nitrilotris(N-arylacetamide) pre-ligands (H3LR ) were prepared (R = NO2, CN, CF3, F, Cl, Br, Et, Me, H, OMe, NMe2) and some of their corresponding Fe and Zn species synthesized. The iron complexes react rapidly with O2, the final products of which are diferric mu-oxo bridged species. The crystal structure of the oxidized product obtained from DMA solutions contain a structural motif found in some diiron proteins. The mechanism of iron mediated O2 reduction was explored to the extent that allowed us to construct an empirically consistent rate law. A Hammett plot was constructed that enabled insightful information into the rate-determining step and hence allows for a differentiation between two kinetically equivalent O2 reduction mechanisms.
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Affiliation(s)
- Roshaan Surendhran
- Department of Chemistry , University at Buffalo , State University of New York , Buffalo , New York 14260 , USA .
| | - Alexander A D'Arpino
- Department of Chemistry , University at Buffalo , State University of New York , Buffalo , New York 14260 , USA .
| | - Bao Y Sciscent
- Department of Chemistry , University at Buffalo , State University of New York , Buffalo , New York 14260 , USA .
| | - Anthony F Cannella
- Department of Chemistry , University at Buffalo , State University of New York , Buffalo , New York 14260 , USA .
| | - Alan E Friedman
- Department of Materials Design & Innovation , University at Buffalo , SUNY , Buffalo , NY 14260 , USA
| | - Samantha N MacMillan
- Department of Chemistry and Chemical Biology , Cornell University , Ithaca , New York 14853 , USA
| | - Rupal Gupta
- Department of Chemistry , College of Staten Island , City University of New York , Staten Island , NY 10314 , USA
| | - David C Lacy
- Department of Chemistry , University at Buffalo , State University of New York , Buffalo , New York 14260 , USA .
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Blackburn SL, Kumar PT, McBride D, Zeineddine HA, Leclerc J, Choi HA, Dash PK, Grotta J, Aronowski J, Cardenas JC, Doré S. Unique Contribution of Haptoglobin and Haptoglobin Genotype in Aneurysmal Subarachnoid Hemorrhage. Front Physiol 2018; 9:592. [PMID: 29904350 PMCID: PMC5991135 DOI: 10.3389/fphys.2018.00592] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/06/2018] [Accepted: 05/02/2018] [Indexed: 01/12/2023] Open
Abstract
Survivors of cerebral aneurysm rupture are at risk for significant morbidity and neurological deficits. Much of this is related to the effects of blood in the subarachnoid space which induces an inflammatory cascade with numerous downstream consequences. Recent clinical trials have not been able to reduce the toxic effects of free hemoglobin or improve clinical outcome. One reason for this may be the inability to identify patients at high risk for neurologic decline. Recently, haptoglobin genotype has been identified as a pertinent factor in diabetes, sickle cell, and cardiovascular disease, with the Hp 2-2 genotype contributing to increased complications. Haptoglobin is a protein synthesized by the liver that binds free hemoglobin following red blood cell lysis, and in doing so, prevents hemoglobin induced toxicity and facilitates clearance. Clinical studies in patients with subarachnoid hemorrhage indicate that Hp 2-2 patients may be a high-risk group for hemorrhage related complications and poor outcome. We review the relevance of haptoglobin in subarachnoid hemorrhage and discuss the effects of genotype and expression levels on the known mechanisms of early brain injury (EBI) and cerebral ischemia after aneurysm rupture. A better understanding of haptoglobin and its role in preventing hemoglobin related toxicity should lead to novel therapeutic avenues.
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Affiliation(s)
- Spiros L Blackburn
- Department of Neurosurgery, The University of Texas Houston Health Sciences Center, Houston, TX, United States
| | - Peeyush T Kumar
- Department of Neurosurgery, The University of Texas Houston Health Sciences Center, Houston, TX, United States
| | - Devin McBride
- Department of Neurosurgery, The University of Texas Houston Health Sciences Center, Houston, TX, United States
| | - Hussein A Zeineddine
- Department of Neurosurgery, The University of Texas Houston Health Sciences Center, Houston, TX, United States
| | - Jenna Leclerc
- Department of Anesthesiology, University of Florida, College of Medicine, Gainesville, FL, United States
| | - H Alex Choi
- Department of Neurosurgery, The University of Texas Houston Health Sciences Center, Houston, TX, United States
| | - Pramod K Dash
- Department of Neurosurgery, The University of Texas Houston Health Sciences Center, Houston, TX, United States
| | - James Grotta
- Department of Neurology, The University of Texas Health Sciences Center, Houston, TX, United States
| | - Jaroslaw Aronowski
- Department of Neurology, The University of Texas Health Sciences Center, Houston, TX, United States
| | - Jessica C Cardenas
- Department of Surgery, Division of Acute Care Surgery and Center for Translational Injury Research, The University of Texas Health Science Center, Houston, TX, United States
| | - Sylvain Doré
- Department of Anesthesiology, University of Florida, College of Medicine, Gainesville, FL, United States.,Departments of Neurology, Psychiatry, Psychology, Pharmaceutics, and Neuroscience, University of Florida, McKnight Brain Institute, Gainesville, FL, United States
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34
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Kassa T, Strader MB, Nakagawa A, Zapol WM, Alayash AI. Targeting βCys93 in hemoglobin S with an antisickling agent possessing dual allosteric and antioxidant effects. Metallomics 2018; 9:1260-1270. [PMID: 28770911 DOI: 10.1039/c7mt00104e] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/17/2023]
Abstract
Sickle cell disease (SCD) is an inherited blood disorder caused by a β globin gene mutation of hemoglobin (HbS). The polymerization of deoxyHbS and its subsequent aggregation (into long fibers) is the primary molecular event which leads to red blood cell (RBC) sickling and ultimately hemolytic anemia. We have recently suggested that HbS oxidative toxicity may also contribute to SCD pathophysiology due to its defective pseudoperoxidase activity. As a consequence, a persistently higher oxidized ferryl heme is formed which irreversibly oxidizes "hotspot" residues (particularly βCys93) causing protein unfolding and subsequent heme loss. In this report we confirmed first, the allosteric effect of a newly developed reagent (di(5-(2,3-dihydro-1,4-benzodioxin-2-yl)-4H-1,2,4-triazol-3-yl)disulfide) (TD-1) on oxygen affinity within SS RBCs. There was a considerable left shift in oxygen equilibrium curves (OECs) representing treated SS cells. Under hypoxic conditions, TD-1 treatment of HbS resulted in an approximately 200 s increase in the delay time of HbS polymerization over the untreated HbS control. The effect of TD-1 binding to HbS was also tested on oxidative reactions by incrementally treating HbS with increasing hydrogen peroxide (H2O2) concentrations. Under these experimental conditions, ferryl levels were consistently reduced by approximately 35% in the presence of TD-1. Mass spectrometric analysis confirmed that upon binding to βCys93, TD-1 effectively blocked irreversible oxidation of this residue. In conclusion, TD-1 appears to shield βCys93 (the end point of radical formation in HbS) and when coupled with its allosteric effect on oxygen affinity may provide new therapeutic modalities for the treatment of SCD.
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Affiliation(s)
- Tigist Kassa
- Laboratory of Biochemistry and Vascular Biology, Center for Biologics Evaluation and Research, Food and Drug Administration, Silver Spring, MD 20993, USA.
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Postnikova GB, Shekhovtsova EA. Myoglobin: Oxygen Depot or Oxygen Transporter to Mitochondria? A Novel Mechanism of Myoglobin Deoxygenation in Cells (review). BIOCHEMISTRY (MOSCOW) 2018; 83:168-183. [PMID: 29618303 DOI: 10.1134/s0006297918020098] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Abstract
In this review, we shortly summarize the data of our studies (and also corresponding studies of other authors) on the new mechanism of myoglobin (Mb) deoxygenation in a cell, according to which Mb acts as an oxygen transporter, and its affinity for the ligand, like in other transporting proteins, is regulated by the interaction with the target, in our case, mitochondria (Mch). We firstly found that contrary to previously formulated and commonly accepted concepts, oxymyoglobin (MbO2) deoxygenation occurs only via interaction of the protein with respiring mitochondria (low pO2 values are necessary but not sufficient for this process to proceed). Detailed studies of the mechanism of Mb-Mch interaction by various physicochemical methods using natural and artificial bilayer phospholipid membranes showed that: (i) the rate of MbO2 deoxygenation in the presence of respiring Mch fully coincides with the rate of O2 uptake by mitochondria from a solution irrespectively of their state (native coupled, freshly frozen, or FCCP-uncoupled), i.e. it is determined by the respiratory activity of Mch; (ii) Mb nonspecifically binds to membrane phospholipids of the outer mitochondrial membrane, while any Mb-specific protein or phospholipid sites on it are lacking; (iii) oxygen uptake by Mch from a solution and the uptake of Mb-bound oxygen are two different processes, as their rates are differently affected by proteins (e.g. lysozyme) that compete with MbO2 for binding to the mitochondrial membrane; (iv) electrostatic forces significantly contribute to the Mb-membrane interactions; the dependence of these interactions on ionic strength is provided by the local electrostatic interactions between anionic groups of phospholipids (the heads) and invariant Lys and Arg residues near the Mb heme pocket; (v) interactions of Mb with phospholipid membranes promote conformational changes in the protein, primarily in its heme pocket, without significant alterations in the protein secondary and tertiary structures; and (vi) Mb-membrane interactions lead to decrease in the affinity of myoglobin for O2, which could be monitored by the increase in the MbO2 autooxidation rate under aerobic conditions and under anaerobic ones, by the shift in the MbO2/Mb(2) equilibrium towards the ligand-free protein. The decrease in the affinity of Mb for the ligand should facilitate O2 dissociation from MbO2 at physiological pO2 values in cells.
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Affiliation(s)
- G B Postnikova
- Institute of Cell Biophysics, Russian Academy of Sciences, Pushchino, Moscow Region, 142290, Russia.
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Kitagishi H, Shimoji D, Ohta T, Kamiya R, Kudo Y, Onoda A, Hayashi T, Weiss J, Wytko JA, Kano K. A water-soluble supramolecular complex that mimics the heme/copper hetero-binuclear site of cytochrome c oxidase. Chem Sci 2018; 9:1989-1995. [PMID: 29675246 PMCID: PMC5892347 DOI: 10.1039/c7sc04732k] [Citation(s) in RCA: 24] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/02/2017] [Accepted: 01/12/2018] [Indexed: 01/16/2023] Open
Abstract
The O2 adduct of an aqueous synthetic heme/copper model system built on a porphyrin/cyclodextrin supramolecular complex has been characterized.
In mitochondria, cytochrome c oxidase (CcO) catalyses the reduction of oxygen (O2) to water by using a heme/copper hetero-binuclear active site. Here we report a highly efficient supramolecular approach for the construction of a water-soluble biomimetic model for the active site of CcO. A tridentate copper(ii) complex was fixed onto 5,10,15,20-tetrakis(4-sulfonatophenyl)porphinatoiron(iii) (FeIIITPPS) through supramolecular complexation between FeIIITPPS and a per-O-methylated β-cyclodextrin dimer linked by a (2,2′:6′,2′′-terpyridyl)copper(ii) complex (CuIITerpyCD2). The reduced FeIITPPS/CuITerpyCD2 complex reacted with O2 in an aqueous solution at pH 7 and 25 °C to form a superoxo-type FeIII–O2–/CuI complex in a manner similar to CcO. The pH-dependent autoxidation of the O2 complex suggests that water molecules gathered at the distal Cu site are possibly involved in the FeIII–O2–/CuI superoxo complex in an aqueous solution. Electrochemical analysis using a rotating disk electrode demonstrated the role of the FeTPPS/CuTerpyCD2 hetero-binuclear structure in the catalytic O2 reduction reaction.
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Affiliation(s)
- Hiroaki Kitagishi
- Department of Molecular Chemistry and Biochemistry , Faculty of Science and Engineering , Doshisha University , Kyotanabe , Kyoto 610-0321 , Japan .
| | - Daiki Shimoji
- Department of Molecular Chemistry and Biochemistry , Faculty of Science and Engineering , Doshisha University , Kyotanabe , Kyoto 610-0321 , Japan .
| | - Takehiro Ohta
- Picobiology Institute , Graduate School of Life Science , University of Hyogo , RSC-UH LP Center , Hyogo 679-5148 , Japan
| | - Ryo Kamiya
- Department of Molecular Chemistry and Biochemistry , Faculty of Science and Engineering , Doshisha University , Kyotanabe , Kyoto 610-0321 , Japan .
| | - Yasuhiro Kudo
- Department of Molecular Chemistry and Biochemistry , Faculty of Science and Engineering , Doshisha University , Kyotanabe , Kyoto 610-0321 , Japan .
| | - Akira Onoda
- Department of Applied Chemistry , Graduate School of Engineering , Osaka University , 2-1 Yamadaoka , Suita 565-0871 , Japan
| | - Takashi Hayashi
- Department of Applied Chemistry , Graduate School of Engineering , Osaka University , 2-1 Yamadaoka , Suita 565-0871 , Japan
| | - Jean Weiss
- Institut de Chimie de Strasbourg , UMR 7177 , CNRS , Université de Strasbourg , 4 Rue Blaise Pascal , 67000 Strasbourg , France
| | - Jennifer A Wytko
- Institut de Chimie de Strasbourg , UMR 7177 , CNRS , Université de Strasbourg , 4 Rue Blaise Pascal , 67000 Strasbourg , France
| | - Koji Kano
- Department of Molecular Chemistry and Biochemistry , Faculty of Science and Engineering , Doshisha University , Kyotanabe , Kyoto 610-0321 , Japan .
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Zhang H, Barralet JE. Mimicking oxygen delivery and waste removal functions of blood. Adv Drug Deliv Rev 2017; 122:84-104. [PMID: 28214553 DOI: 10.1016/j.addr.2017.02.001] [Citation(s) in RCA: 31] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/23/2016] [Revised: 02/13/2017] [Accepted: 02/13/2017] [Indexed: 12/20/2022]
Abstract
In addition to immunological and wound healing cell and platelet delivery, ion stasis and nutrient supply, blood delivers oxygen to cells and tissues and removes metabolic wastes. For decades researchers have been trying to develop approaches that mimic these two immediately vital functions of blood. Oxygen is crucial for the long-term survival of tissues and cells in vertebrates. Hypoxia (oxygen deficiency) and even at times anoxia (absence of oxygen) can occur during organ preservation, organ and cell transplantation, wound healing, in tumors and engineering of tissues. Different approaches have been developed to deliver oxygen to tissues and cells, including hyperbaric oxygen therapy (HBOT), normobaric hyperoxia therapy (NBOT), using biochemical reactions and electrolysis, employing liquids with high oxygen solubility, administering hemoglobin, myoglobin and red blood cells (RBCs), introducing oxygen-generating agents, using oxygen-carrying microparticles, persufflation, and peritoneal oxygenation. Metabolic waste accumulation is another issue in biological systems when blood flow is insufficient. Metabolic wastes change the microenvironment of cells and tissues, influence the metabolic activities of cells, and ultimately cause cell death. This review examines advances in blood mimicking systems in the field of biomedical engineering in terms of oxygen delivery and metabolic waste removal.
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38
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Tofteskov J, Hansen J, Bailey N. Modelling the autoxidation of myoglobin in fresh meat under modified atmosphere packing conditions. J FOOD ENG 2017. [DOI: 10.1016/j.jfoodeng.2017.06.002] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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39
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Waga M, Takeda S, Sakata R. A method for extracting carboxy-myoglobin from beef. Anim Sci J 2017; 89:467-473. [PMID: 29052941 DOI: 10.1111/asj.12942] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/27/2015] [Accepted: 08/17/2017] [Indexed: 11/30/2022]
Abstract
The present study was conducted to devise a method for the effective extraction of carboxy-myoglobin (COMb) from beef without carbon monoxide dissociation. The ratio of COMb to myoglobin was computed at absorptions of wavelengths 541 and 551 nm, which characterize COMb and the isosbestic point between COMb and deoxy-myoglobin, respectively. The COMb extraction rate was found to vary with temperature, pH and oxygen conditions. The decrease observed in this rate was inversely proportional to the rise in extraction temperature. The COMb extraction rate was also affected by pH, and the stability of COMb in the extract solution was the highest at pH 8.0-9.0. Moreover, the presence of oxygen was found to disturb COMb extraction. According to these results, nearly all COMb could be extracted from carbon-monoxide-treated beef under stirring conditions in pH 8.5 deoxidized buffer, at 1°C, and under N2 flow with the improved extraction method in this study (98.1 ± 2.7%). The decrement of COMb in the extract was accelerated by light, and the COMb was stable for 20 min in the dark, at 1°C. The extraction conditions for COMb described above should allow the accurate evaluation of COMb in meat tissue.
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Affiliation(s)
- Masahiro Waga
- Graduate School of Veterinary Science, Azabu University, Sagamihara, Japan.,Central Research Institute, Itoham Foods Inc., Moriya, Japan
| | - Shiro Takeda
- Department of Animal Science and Biotechnology, School of Veterinary Medicine, Azabu University, Sagamihara, Japan
| | - Ryoichi Sakata
- Graduate School of Veterinary Science, Azabu University, Sagamihara, Japan.,Department of Animal Science and Biotechnology, School of Veterinary Medicine, Azabu University, Sagamihara, Japan
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40
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Yamada M, Sakai H. Hidden Antioxidative Functions of Reduced Nicotinamide Adenine Dinucleotide Coexisting with Hemoglobin. ACS Chem Biol 2017; 12:1820-1829. [PMID: 28485916 DOI: 10.1021/acschembio.7b00174] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Abstract
Ferrous oxyhemoglobin (HbO2) in red blood cells (RBCs) invariably and slowly autoxidizes to form ferric methemoglobin (metHb). However, the level of metHb is always maintained below 0.5% by intracellular metHb reduction of enzymatic systems with coenzymes, such as reduced nicotinamide adenine dinucleotide (NADH), and by superoxide dismutase (SOD) and catalase (CAT), which eliminate reactive oxygen species. Unquestionably, NADH cannot reduce metHb without the corresponding enzymatic system. Our study, however, demonstrated that a high concentration of NADH (100-fold of normal level, equimolar to HbO2) retarded autoxidation of HbO2 in a highly purified Hb solution with no enzymatic system. Furthermore, an inhibitory effect of NADH on metHb formation was observed with additions of oxidants such as H2O2, NO, and NaNO2. Our mechanism assessment elucidated extremely high pseudo-CAT and pseudo-SOD activities of NADH with coexistence of HbO2, and reactivity of NADH with NO. We prepared a model of RBCs (Hb-vesicles, Hb-V) encapsulating purified HbO2 solution and NADH, but no enzymatic system within liposome. We confirmed the inhibitory effect of NADH on both autoxidation and oxidant-induced metHb formation. In addition, an intravenous administration of these Hb-Vs to rats caused significant retardation of metHb formation by approximately 50% compared to the case without NADH coencapsulation. Based on these results, we elucidated a new role of NADH, that is, antioxidative effect via interaction with Hb, in addition to its classical role as a coenzyme.
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Affiliation(s)
- Magohei Yamada
- Department of Chemistry, Nara Medical University, 840 Shijo-cho, Kashihara, Nara 634-8521, Japan
| | - Hiromi Sakai
- Department of Chemistry, Nara Medical University, 840 Shijo-cho, Kashihara, Nara 634-8521, Japan
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Abstract
NADPH oxidases (NOXs) are the only enzymes exclusively dedicated to reactive oxygen species (ROS) generation. Dysregulation of these polytopic membrane proteins impacts the redox signaling cascades that control cell proliferation and death. We describe the atomic crystal structures of the catalytic flavin adenine dinucleotide (FAD)- and heme-binding domains of Cylindrospermum stagnale NOX5. The two domains form the core subunit that is common to all seven members of the NOX family. The domain structures were then docked in silico to provide a generic model for the NOX family. A linear arrangement of cofactors (NADPH, FAD, and two membrane-embedded heme moieties) injects electrons from the intracellular side across the membrane to a specific oxygen-binding cavity on the extracytoplasmic side. The overall spatial organization of critical interactions is revealed between the intracellular loops on the transmembrane domain and the NADPH-oxidizing dehydrogenase domain. In particular, the C terminus functions as a toggle switch, which affects access of the NADPH substrate to the enzyme. The essence of this mechanistic model is that the regulatory cues conformationally gate NADPH-binding, implicitly providing a handle for activating/deactivating the very first step in the redox chain. Such insight provides a framework to the discovery of much needed drugs that selectively target the distinct members of the NOX family and interfere with ROS signaling.
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Vejarano R, Siche R, Tesfaye W. Evaluation of biological contaminants in foods by hyperspectral imaging: A review. INTERNATIONAL JOURNAL OF FOOD PROPERTIES 2017. [DOI: 10.1080/10942912.2017.1338729] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/24/2023]
Affiliation(s)
- Ricardo Vejarano
- Facultad de Ciencias Agropecuarias, Universidad Nacional de Trujillo (UNT), Ciudad Universitaria, Trujillo, Peru
- Facultad de Ingeniería, Universidad Privada del Norte (UPN), Trujillo, Peru
| | - Raúl Siche
- Facultad de Ciencias Agropecuarias, Universidad Nacional de Trujillo (UNT), Ciudad Universitaria, Trujillo, Peru
| | - Wendu Tesfaye
- Departamento de Química y Tecnología de Alimentos, Universidad Politécnica de Madrid (UPM), Madrid, Spain
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Strader MB, Alayash AI. Exploring Oxidative Reactions in Hemoglobin Variants Using Mass Spectrometry: Lessons for Engineering Oxidatively Stable Oxygen Therapeutics. Antioxid Redox Signal 2017; 26:777-793. [PMID: 27626360 PMCID: PMC5421604 DOI: 10.1089/ars.2016.6805] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/28/2016] [Revised: 09/09/2016] [Accepted: 09/12/2016] [Indexed: 01/29/2023]
Abstract
SIGNIFICANCE Worldwide demand has driven the development of hemoglobin (Hb)-based oxygen carriers (HBOCs) as potential acellular oxygen therapeutics. HBOCs have the potential to provide an oxygen bridge to patients and minimize current problems associated with supply and storage of donated blood. However, to date, safety and efficacy issues have hampered the approval of viable HBOCs in the United States. These previous efforts have underscored the need for a better molecular understanding of toxicity to design safe and oxidatively stable HBOCs. Recent Advances: High-resolution accurate mass (HRAM) mass spectrometry (MS) has recently become a versatile tool in characterizing oxidative post-translational modifications that occur in Hb. When integrated with other analytical techniques, HRAM data have been invaluable in providing mechanistic insight into the extent of oxidative modification by quantifying oxidation in amino acids near the reactive heme or at specific "oxidative hotspots." CRITICAL ISSUES In addition to providing a deeper understanding of Hb oxidative toxicity, HRAM MS studies are currently being used toward developing suitable HBOCs using a "two-prong" strategy that involves (i) understanding the mechanism of Hb toxicity by evaluating mutant Hbs identified in patients with hemoglobinopathies and (ii) utilizing this information toward designing against (or for) these reactions in acellular oxygen therapeutics that will result in oxidatively stable protein. FUTURE DIRECTIONS Future HRAM studies are aimed at fully characterizing engineered candidate HBOCs to determine the most oxidatively stable protein while retaining oxygen carrying function in vivo. Antioxid. Redox Signal. 26, 777-793.
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Affiliation(s)
- Michael Brad Strader
- Laboratory of Biochemistry and Vascular Biology, Center for Biologics Evaluation and Research , Food and Drug Administration, Silver Spring, Maryland
| | - Abdu I Alayash
- Laboratory of Biochemistry and Vascular Biology, Center for Biologics Evaluation and Research , Food and Drug Administration, Silver Spring, Maryland
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44
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Postnikova GB, Shekhovtsova EA. Hemoglobin and myoglobin as reducing agents in biological systems. Redox reactions of globins with copper and iron salts and complexes. BIOCHEMISTRY (MOSCOW) 2017; 81:1735-1753. [DOI: 10.1134/s0006297916130101] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/17/2023]
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45
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Kitagishi H, Minegishi S. Iron(II)porphyrin–Cyclodextrin Supramolecular Complex as a Carbon Monoxide-Depleting Agent in Living Organisms. Chem Pharm Bull (Tokyo) 2017; 65:336-340. [DOI: 10.1248/cpb.c16-00767] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Affiliation(s)
- Hiroaki Kitagishi
- Department of Molecular Chemistry and Biochemistry, Faculty of Science and Engineering, Doshisha University
| | - Saika Minegishi
- Department of Molecular Chemistry and Biochemistry, Faculty of Science and Engineering, Doshisha University
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Parker L, Shaw CS, Stepto NK, Levinger I. Exercise and Glycemic Control: Focus on Redox Homeostasis and Redox-Sensitive Protein Signaling. Front Endocrinol (Lausanne) 2017; 8:87. [PMID: 28529499 PMCID: PMC5418238 DOI: 10.3389/fendo.2017.00087] [Citation(s) in RCA: 31] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/31/2017] [Accepted: 04/04/2017] [Indexed: 12/16/2022] Open
Abstract
Physical inactivity, excess energy consumption, and obesity are associated with elevated systemic oxidative stress and the sustained activation of redox-sensitive stress-activated protein kinase (SAPK) and mitogen-activated protein kinase signaling pathways. Sustained SAPK activation leads to aberrant insulin signaling, impaired glycemic control, and the development and progression of cardiometabolic disease. Paradoxically, acute exercise transiently increases oxidative stress and SAPK signaling, yet postexercise glycemic control and skeletal muscle function are enhanced. Furthermore, regular exercise leads to the upregulation of antioxidant defense, which likely assists in the mitigation of chronic oxidative stress-associated disease. In this review, we explore the complex spatiotemporal interplay between exercise, oxidative stress, and glycemic control, and highlight exercise-induced reactive oxygen species and redox-sensitive protein signaling as important regulators of glucose homeostasis.
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Affiliation(s)
- Lewan Parker
- Institute of Sport, Exercise and Active Living (ISEAL), College of Sport and Exercise Science, Victoria University, Melbourne, VIC, Australia
- *Correspondence: Lewan Parker, ,
| | - Christopher S. Shaw
- Institute for Physical Activity and Nutrition, School of Exercise and Nutrition Sciences, Deakin University, Geelong, VIC, Australia
| | - Nigel K. Stepto
- Institute of Sport, Exercise and Active Living (ISEAL), College of Sport and Exercise Science, Victoria University, Melbourne, VIC, Australia
- Monash Centre for Health Research and Implementation, School of Public Health and Preventative Medicine, Monash University, Clayton, VIC, Australia
- Australian Institute for Musculoskeletal Science (AIMSS), Victoria University and Western Health, St. Albans, VIC, Australia
| | - Itamar Levinger
- Institute of Sport, Exercise and Active Living (ISEAL), College of Sport and Exercise Science, Victoria University, Melbourne, VIC, Australia
- Australian Institute for Musculoskeletal Science (AIMSS), Victoria University and Western Health, St. Albans, VIC, Australia
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Kassa T, Jana S, Meng F, Alayash AI. Differential heme release from various hemoglobin redox states and the upregulation of cellular heme oxygenase-1. FEBS Open Bio 2016; 6:876-84. [PMID: 27642551 PMCID: PMC5011486 DOI: 10.1002/2211-5463.12103] [Citation(s) in RCA: 50] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/06/2016] [Revised: 07/05/2016] [Accepted: 07/11/2016] [Indexed: 01/24/2023] Open
Abstract
Despite advances in our understanding of the oxidative pathways mediated by free hemoglobin (Hb), the precise contribution of its highly reactive redox forms to tissue and organ toxicities remains ambiguous. Heme, a key degradation byproduct of Hb oxidation, has recently been recognized as a damage-associated molecular pattern (DAMP) molecule, able to trigger inflammatory responses. Equally damaging is the interaction of the highly redox active forms of Hb with other biological molecules. We determined the kinetics of heme loss from individual Hb redox states-ferrous (Fe(2+)), ferric (Fe(3+)), and ferryl (Fe(4+))-using two different heme receptor proteins: hemopexin (Hxp), a naturally occurring heme scavenger in plasma, and a double mutant (H64Y/V86F), apomyoglobin (ApoMb), which avidly binds heme released from Hb. We show for the first time that ferric Hb (Fe(3+)) loses heme at rates substantially higher than that of ferryl Hb (Fe(4+)). This was also supported by a higher expression of heme oxygenase-1 (HO-1) when ferric Hb was added to cultured lung alveolar epithelial cells (E10). The reported cytotoxicity of Hb may therefore be attributed to a combination of accelerated heme loss from the ferric form and protein radical formation associated with ferryl Hb. Targeted therapeutic interventions can therefore be designed to curb specific oxidative pathways of Hb in hemolytic anemias and when Hb is used as an oxygen-carrying therapeutic.
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Affiliation(s)
- Tigist Kassa
- Laboratory of Biochemistry and Vascular Biology Center for Biologics Evaluation and Research Food and Drug Administration Silver Spring MD USA
| | - Sirsendu Jana
- Laboratory of Biochemistry and Vascular Biology Center for Biologics Evaluation and Research Food and Drug Administration Silver Spring MD USA
| | - Fantao Meng
- Laboratory of Biochemistry and Vascular Biology Center for Biologics Evaluation and Research Food and Drug Administration Silver Spring MD USA
| | - Abdu I Alayash
- Laboratory of Biochemistry and Vascular Biology Center for Biologics Evaluation and Research Food and Drug Administration Silver Spring MD USA
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48
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Kitagishi H, Minegishi S, Yumura A, Negi S, Taketani S, Amagase Y, Mizukawa Y, Urushidani T, Sugiura Y, Kano K. Feedback Response to Selective Depletion of Endogenous Carbon Monoxide in the Blood. J Am Chem Soc 2016; 138:5417-25. [DOI: 10.1021/jacs.6b02211] [Citation(s) in RCA: 46] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/24/2023]
Affiliation(s)
- Hiroaki Kitagishi
- Department of Molecular Chemistry and Biochemistry,
Faculty of Science and Engineering, Doshisha University, Kyotanabe, Kyoto 610-0321, Japan
| | - Saika Minegishi
- Department of Molecular Chemistry and Biochemistry,
Faculty of Science and Engineering, Doshisha University, Kyotanabe, Kyoto 610-0321, Japan
| | - Aki Yumura
- Department of Molecular Chemistry and Biochemistry,
Faculty of Science and Engineering, Doshisha University, Kyotanabe, Kyoto 610-0321, Japan
| | - Shigeru Negi
- Faculty
of Pharmaceutical Sciences, Doshisha Women’s College of Liberal Arts, Kyotanabe,
Kyoto 610-0395, Japan
| | - Shigeru Taketani
- Department of Microbiology, Kansai Medical University, Hirakata, Osaka 573-1010, Japan
| | - Yoko Amagase
- Faculty
of Pharmaceutical Sciences, Doshisha Women’s College of Liberal Arts, Kyotanabe,
Kyoto 610-0395, Japan
| | - Yumiko Mizukawa
- Faculty
of Pharmaceutical Sciences, Doshisha Women’s College of Liberal Arts, Kyotanabe,
Kyoto 610-0395, Japan
| | - Tetsuro Urushidani
- Faculty
of Pharmaceutical Sciences, Doshisha Women’s College of Liberal Arts, Kyotanabe,
Kyoto 610-0395, Japan
| | - Yukio Sugiura
- Faculty
of Pharmaceutical Sciences, Doshisha Women’s College of Liberal Arts, Kyotanabe,
Kyoto 610-0395, Japan
| | - Koji Kano
- Department of Molecular Chemistry and Biochemistry,
Faculty of Science and Engineering, Doshisha University, Kyotanabe, Kyoto 610-0321, Japan
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49
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Imabeppu K, Kuwano H, Yutani E, Kitagishi H, Kano K. Photoinduced Homolysis of Alkyl–Cobalt(III) Bonds in a Cyclodextrin Cage. Eur J Inorg Chem 2016. [DOI: 10.1002/ejic.201600208] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
- Kohei Imabeppu
- Department of Molecular Chemistry and Biochemistry, Doshisha University Kyotanabe, Kyoto 610‐0321, Japan, http://www1.doshisha.ac.jp/~kkano/
| | - Hiroyuki Kuwano
- Department of Molecular Chemistry and Biochemistry, Doshisha University Kyotanabe, Kyoto 610‐0321, Japan, http://www1.doshisha.ac.jp/~kkano/
| | - Eriko Yutani
- Department of Molecular Chemistry and Biochemistry, Doshisha University Kyotanabe, Kyoto 610‐0321, Japan, http://www1.doshisha.ac.jp/~kkano/
| | - Hiroaki Kitagishi
- Department of Molecular Chemistry and Biochemistry, Doshisha University Kyotanabe, Kyoto 610‐0321, Japan, http://www1.doshisha.ac.jp/~kkano/
| | - Koji Kano
- Department of Molecular Chemistry and Biochemistry, Doshisha University Kyotanabe, Kyoto 610‐0321, Japan, http://www1.doshisha.ac.jp/~kkano/
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50
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Shen L, Qu R, Shi H, Huang F, An Y, Shi L. A biocompatible cobaltporphyrin-based complex micelle constructed via supramolecular assembly for oxygen transfer. Biomater Sci 2016; 4:857-62. [PMID: 27009911 DOI: 10.1039/c6bm00046k] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Herein, a complex micelle as an oxygen nano-carrier is constructed through the hierarchical assembly of the diblock copolymer poly(ethylene glycol)-block-poly(l-lysine) (PEG-b-PLys), tetrakis(4-sulfonatophenyl)porphinato cobalt(ii) (Co(ii)TPPS), a heptapeptide (Cys-His-His-His-His-His-His) and heptakis(2,3,6-tri-O-methyl)-β-cyclodextrin (TM-β-CD). Co(ii)TPPS was encapsulated into the cavities of TM-β-CDs driven by the host-guest interaction so that the irreversible formation of a μ-oxo-dimer of Co(ii)TPPS can be effectively prevented. The imidazole groups of the heptapeptide were selected as good axial ligands coordinating to the centric cobalt of Co(ii)TPPS, which subtly constituted the five-coordinated precursor serving as an active functional centre for oxygen binding. The sixth position of Co(ii)TPPS can bind oxygen. Furthermore, the host-guest inclusion (TM-β-CD/Co(ii)TPPS) was loaded into the hydrophobic core of the complex micelle and tightly fixed with PLys chains. The hydrophilic PEG blocks stretched in the aqueous solution constitute the shells which stabilize the structure of the complex micelle as well as impart the complex micelle sufficient blood circulation time. Moreover, the complex micelle exhibited excellent biocompatibility and cellular uptake. Therefore, the rationally designed amphiphilic structure can work as promising artificial O2 carriers in vivo. Potentially, the complex micelle can be expected to change the anaerobic microenvironment and find applications in the repair of the cells damaged by cellular hypoxia.
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Affiliation(s)
- Liangliang Shen
- State Key Laboratory of Medicinal Chemical Biology, Key Laboratory of Functional Polymer Materials, Ministry of Education, Collaborative Innovation Center of Chemical Science and Engineering (Tianjin), Institute of Polymer Chemistry, Nankai University, Tianjin, 300071, P.R. China.
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