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Journal of Biological Inorganic Chemistry: JBIC

Frithjof C Küpper, Eric P Miller, Stephen J Andrews, Claire Hughes, Lucy J Carpenter, Wolfram Meyer-Klaucke, Chiaki Toyama, Yasuyuki Muramatsu, Martin C Feiters, Carl J Carrano
This study explores key features of bromine and iodine metabolism in the filamentous brown alga and genomics model Ectocarpus siliculosus. Both elements are accumulated in Ectocarpus, albeit at much lower concentration factors (2-3 orders of magnitude for iodine, and < 1 order of magnitude for bromine) than e.g. in the kelp Laminaria digitata. Iodide competitively reduces the accumulation of bromide. Both iodide and bromide are accumulated in the cell wall (apoplast) of Ectocarpus, with minor amounts of bromine also detectable in the cytosol...
March 9, 2018: Journal of Biological Inorganic Chemistry: JBIC
Mauricio Cardenas-Rodriguez, Afroditi Chatzi, Kostas Tokatlidis
Iron-sulfur clusters are ubiquitous inorganic co-factors that contribute to a wide range of cell pathways including the maintenance of DNA integrity, regulation of gene expression and protein translation, energy production, and antiviral response. Specifically, the iron-sulfur cluster biogenesis pathways include several proteins dedicated to the maturation of apoproteins in different cell compartments. Given the complexity of the biogenesis process itself, the iron-sulfur research area constitutes a very challenging and interesting field with still many unaddressed questions...
March 6, 2018: Journal of Biological Inorganic Chemistry: JBIC
Benelita T Elie, Yuriy Pechenyy, Fathema Uddin, María Contel
Heterobimetallic compounds are designed to harness chemotherapeutic traits of distinct metal species into a single molecule. The ruthenium-gold (Ru-Au) family of compounds based on Au-N-heterocyclic carbene (NHC) fragments [Cl2 (p-cymene)Ru(μ-dppm)Au(NHC)]ClO4 was conceived to combine the known antiproliferative and cytotoxic properties of Au-NHC-based compounds and the antimigratory, antimetastatic, and antiangiogenic characteristic of specific Ru-based compounds. Following recent studies of the anticancer efficacies of these Ru-Au-NHC complexes with promising potential as chemotherapeutics against colorectal, and renal cancers in vitro, we report here on the mechanism of a selected compound, [Cl2 (p-cymene)Ru(μ-dppm)Au(IMes)]ClO4 (RANCE-1, 1)...
March 5, 2018: Journal of Biological Inorganic Chemistry: JBIC
Dhurairajan Senthilnathan, Rajadurai Vijay Solomon, Shanmugam Kiruthika, Ponnambalam Venuvanalingam, Mahesh Sundararajan
Bent metallocenes (BM) have anti-tumor properties but they face a serious drug efficacy problem due to poor aqueous solubility and rapid hydrolysis under physiological conditions. These two problems can be fixed by encapsulating them in host molecules such as cyclodextrin (CD), cucurbituril (CB) etc. Experimentally, CD-BM, CB-BM host-guest complexes have been investigated to check the efficiency of the drug delivery and efficiency of the encapsulated drug. CB has been reported to be a better host than CD but the reasons for this has not been figured out...
March 3, 2018: Journal of Biological Inorganic Chemistry: JBIC
Alexey P Orlov, Marina A Orlova, Tatiana P Trofimova, Stepan N Kalmykov, Dmitry A Kuznetsov
Zinc is one of the most important microelements necessary for normal body functioning. Zinc is marked in numerous diseases and, hence, its properties and behavior in the body have long been a subject of extensive study. This review considers trends in the assessment of the role of zinc and its compounds in the past decade. It becomes evident that redox-inactive zinc is the main supervisor in the conformation of the most important molecules in all body organs and tissues. We placed emphasis on the variety of zinc-binding sites and the role of zinc in the genesis and progress of different forms of leukemia...
February 28, 2018: Journal of Biological Inorganic Chemistry: JBIC
Michela Ciabocco, Patrizia Cancemi, Maria Luisa Saladino, Eugenio Caponetti, Rosa Alduina, Mario Berrettoni
This paper deals with the synthesis and characterization of iron-hexacyanocobaltate (FeHCC) and its antibacterial properties. The nanoparticles were prepared by a facile co-precipitation technique. Crystal structure, particle morphology, and elemental composition were determined using X-ray Powder Diffraction, X-ray fluorescence spectroscopy, Transmission Electron Microscopy (TEM), and Infrared Spectroscopy (IR). The antibacterial activity of the FeHCC nanoparticles was tested against Escherichia coli and Staphylococcus aureus as models for Gram-negative and Gram-positive bacteria, respectively, by bacterial counting method and microscopic visualization (TEM, FEG-SEM, and fluorescence microscopy)...
February 24, 2018: Journal of Biological Inorganic Chemistry: JBIC
Wilfred R Hagen
From the very first discovery of biological iron-sulfur clusters with EPR, the spectroscopy has been used to study not only purified proteins but also complex systems such as respiratory complexes, membrane particles and, later, whole cells. In recent times, the emphasis of iron-sulfur biochemistry has moved from characterization of individual proteins to the systems biology of iron-sulfur biosynthesis, regulation, degradation, and implications for human health. Although this move would suggest a blossoming of System-EPR as a specific, non-invasive monitor of Fe/S (dys)homeostasis in whole cells, a review of the literature reveals limited success possibly due to technical difficulties in adherence to EPR spectroscopic and biochemical standards...
February 21, 2018: Journal of Biological Inorganic Chemistry: JBIC
Cristina Núñez, Sergio Vázquez Estévez, María Del Pilar Chantada
Nanoparticles are being actively developed for biomolecular profiling of cancer biomarkers, tumor imaging in vivo, and targeted drug delivery. These nanotechnology-based techniques can be applied widely in the management of different malignant diseases, such as breast cancer. Although the number of different types of nanoparticles is increasing rapidly, most can be classified into two major types: particles that contain organic molecules as a major building material (such as dendrimers, micelles, liposomes and carbon nanotubes, and other polymers); and those that use inorganic elements, usually metals, as a core...
February 16, 2018: Journal of Biological Inorganic Chemistry: JBIC
Mériem Merrouch, Martino Benvenuti, Marco Lorenzi, Christophe Léger, Vincent Fourmond, Sébastien Dementin
Nickel-containing enzymes are diverse in terms of function and active site structure. In many cases, the biosynthesis of the active site depends on accessory proteins which transport and insert the Ni ion. We review and discuss the literature related to the maturation of carbon monoxide dehydrogenases (CODH) which bear a nickel-containing active site consisting of a [Ni-4Fe-4S] center called the C-cluster. The maturation of this center has been much less studied than that of other nickel-containing enzymes such as urease and NiFe hydrogenase...
February 14, 2018: Journal of Biological Inorganic Chemistry: JBIC
Ola Karmi, Henri-Baptiste Marjault, Luca Pesce, Paolo Carloni, Jose' N Onuchic, Patricia A Jennings, Ron Mittler, Rachel Nechushtai
NEET proteins comprise a new class of [2Fe-2S] cluster proteins. In human, three genes encode for NEET proteins: cisd1 encodes mitoNEET (mNT), cisd2 encodes the Nutrient-deprivation autophagy factor-1 (NAF-1) and cisd3 encodes MiNT (Miner2). These recently discovered proteins play key roles in many processes related to normal metabolism and disease. Indeed, NEET proteins are involved in iron, Fe-S, and reactive oxygen homeostasis in cells and play an important role in regulating apoptosis and autophagy. mNT and NAF-1 are homodimeric and reside on the outer mitochondrial membrane...
February 12, 2018: Journal of Biological Inorganic Chemistry: JBIC
Justyna Polaczek, Łukasz Orzeł, Grażyna Stochel, Rudi van Eldik
Despite detailed studies on nitroxylcobalamin (CblNO) formation, the possible intracellular generation of CblNO via reduction of nitrocobalamin (CblNO 2 ) remains questionable. To study this further, spectroscopic studies on the reaction of CblNO 2 with the intracellular antioxidant ascorbic acid (HAsc - ) were performed in aqueous solution at pH < 5.0. It was found that nitroxylcobalamin is the final product of this interaction, which is not just a simple reaction but a rather complex chemical process. We clearly show that an excess of nitrite suppresses the formation of CblNO, from which it follows that ascorbic acid cannot reduce coordinated nitrite...
February 12, 2018: Journal of Biological Inorganic Chemistry: JBIC
Michal Maixner, Helio F Dos Santos, Jaroslav V Burda
Interaction of cisplatin in activated diaqua-form with His-Met dipeptide is explored using DFT approach with PCM model. First the conformation space of the dipeptide is explored to find the most stable structure (labeled 0683). Several functionals with double-zeta basis set are used for optimization and obtained order of conformers is confirmed by the CCSD(T) single-point calculations. Supermolecular model is used to determine reaction coordinate for the replacement of aqua ligands consequently by N-site of histidine and S-site of methionine and reversely...
February 8, 2018: Journal of Biological Inorganic Chemistry: JBIC
Maneka Hoonjan, Vaibhav Jadhav, Purvi Bhatt
Arsenic and its various forms have been in use in ancient Chinese medicine for more than 2000 years. Arsenicals have gained importance for having remedial effects for various diseases from syphilis to cancer thus highlighting its role as a therapeutic agent even though it has been labelled as a potential 'poison'. The ability of arsenic, specifically arsenic trioxide, to treat acute promyelocytic leukaemia has radically changed the perception of this poison and has been the main factor for the re-emergence of this candidate to Western medicine for the treatment of leukaemia and other solid tumours...
February 2, 2018: Journal of Biological Inorganic Chemistry: JBIC
Smilja Todorovic, Miguel Teixeira
Resonance Raman spectra of Fe-S proteins are sensitive to the cluster type, structure and symmetry. Furthermore, bands that originate from bridging and terminal Fe-S vibrations in the 2Fe-2S, 3Fe-4S and 4Fe-4S clusters can be sensitively distinguished in the spectra, as well as the type of non-cysteinyl coordinating ligands, if present. For these reasons, resonance Raman spectroscopy has been playing an exceptionally active role in the studies of Fe-S proteins of diverse structures and functions. We provide here a concise overview of the structural information that can be obtained from resonance Raman spectroscopy on Fe-S clusters, and in parallel, refer to their thermodynamic properties (e...
January 24, 2018: Journal of Biological Inorganic Chemistry: JBIC
Ricardo Garcia-Serres, Martin Clémancey, Jean-Marc Latour, Geneviève Blondin
Fe/S cluster biogenesis involves a complex machinery comprising several mitochondrial and cytosolic proteins. Fe/S cluster biosynthesis is closely intertwined with iron trafficking in the cell. Defects in Fe/S cluster elaboration result in severe diseases such as Friedreich ataxia. Deciphering this machinery is a challenge for the scientific community. Because iron is a key player, 57Fe-Mössbauer spectroscopy is especially appropriate for the characterization of Fe species and monitoring the iron distribution...
January 19, 2018: Journal of Biological Inorganic Chemistry: JBIC
Bruno Demoro, Santiago Rostán, Mauricio Moncada, Zhu-Hong Li, Roberto Docampo, Claudio Olea Azar, Juan Diego Maya, Julia Torres, Dinorah Gambino, Lucía Otero
To face the high costs of developing new drugs, researchers in both industry and academy are looking for ways to repurpose old drugs for new uses. In this sense, bisphosphonates that are clinically used for bone diseases have been studied as agents against Trypanosoma cruzi, causative parasite of Chagas disease. In this work, the development of first row transition metal complexes (M = Co2+, Mn2+, Ni2+) with the bisphosphonate ibandronate (iba, H4iba representing the neutral form) is presented. The in-solution behavior of the systems containing iba and the selected 3d metal ions was studied by potentiometry...
January 18, 2018: Journal of Biological Inorganic Chemistry: JBIC
Jonathan Przybyla-Toscano, Mélanie Roland, Frédéric Gaymard, Jérémy Couturier, Nicolas Rouhier
One reason why iron is an essential element for most organisms is its presence in prosthetic groups such as hemes or iron-sulfur (Fe-S) clusters, which are notably required for electron transfer reactions. As an organelle with an intense metabolism in plants, chloroplast relies on many Fe-S proteins. This includes those present in the electron transfer chain which will be, in fact, essential for most other metabolic processes occurring in chloroplasts, e.g., carbon fixation, nitrogen and sulfur assimilation, pigment, amino acid, and vitamin biosynthetic pathways to cite only a few examples...
January 18, 2018: Journal of Biological Inorganic Chemistry: JBIC
Josué Pacheco, Dimitri Niks, Russ Hille
We have examined the kinetic and spectroscopic properties of a tungsten-substituted form of DMSO reductase from Rhodobacter sphaeroides, an enzyme that normally possesses molybdenum. Partial reduction with sodium dithionite yields a well-resolved W(V) EPR signal of the so-called "high-g split" type that exhibits markedly greater g-anisotropy than the corresponding Mo(V) signal of the native form of the enzyme, with the g values shifted to higher magnetic field by as much as Δgave = 0.056. Deuteration of the enzyme confirms that the coupled proton is solvent-exchangeable, allowing us to accurately simulate the tungsten hyperfine coupling...
January 3, 2018: Journal of Biological Inorganic Chemistry: JBIC
Hao Zhang, Ling Yang, Wanjian Ding, Yingying Ma
The accepted catalytic mechanism of alkaline phosphatases was established on the hypothesis that Mg-coordinated water is a readily available hydroxide ion that functions as a general base and accepts a proton from the Ser102 hydroxyl group. The roles of the two distinctive residues Asp153 and Lys328 in Escherichia coli alkaline phosphatase (ECAP), which distinguish it from the mammalian enzymes, are elusive. Based on the crystal structures of ECAP in the absence and presence of inorganic phosphate, we have investigated the activation of Ser102 for nucleophilic attack and the subsequent formation of a covalent phosphoseryl intermediate using hybrid density functional theory (DFT) with the B3LYP functional...
December 30, 2017: Journal of Biological Inorganic Chemistry: JBIC
Muhamed Amin, Zainab Mohamed, Mohamed El-Sayed, Asmaa Samy, Afnan Sultan, Mahmoud Bassuoni, Mohamed H Alkordi
Superoxide dismutases (SOD) are vital enzymes for disproportionation of superoxide molecules in mammals. Despite the high similarity between the Mn-SOD and Fe-SOD, they are inactive if the metals in the active sites are exchanged. Here, we use DFT, QM/MM and Monte Carlo sampling to optimize the crystal structure and to calculate the mid-point potential for the native and substituted Mn/Fe-SOD. The optimized DFT and QM/MM structures of the Mn-SOD show a major conformational change for the conserved TYR34 compared to the X-ray structure...
December 27, 2017: Journal of Biological Inorganic Chemistry: JBIC
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