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Journal of Biological Inorganic Chemistry: JBIC

Paolo Ascenzi, Giovanna De Simone, Diego Sbardella, Massimo Coletta
Microperoxidase-11 (MP11) is an undecapeptide derived from horse heart cytochrome c, which is considered as a heme-protein model. Here, the reductive nitrosylation of ferric MP11 (MP11(III)) under anaerobic conditions has been investigated between pH 7.4 and 9.2, at T = 20.0 °C. At pH ≤ 7.7, NO binds reversibly to MP11(III) leading to the formation of the MP11(III)-NO complex. However, between pH 8.2 and 9.2, the addition of NO to MP11(III) leads to the formation of ferrous nitrosylated MP11(II) (MP11(II)-NO)...
November 2, 2018: Journal of Biological Inorganic Chemistry: JBIC
E André, V Derrien, P Sebban, N Assrir, E Lescop, S Bernad
Human neuroglobin (Ngb) is a hexacoordinated globin which binds some small ligands. Its function is still not well-established, even though Ngb seems to be implicated in the protection against neurodegenerative diseases. It has been shown by molecular dynamics and crystallography that ligand binding could occur thanks to a haem sliding mechanism specific to Ngb. In this paper, we studied some regions which could participate in this mechanism. We used UV-visible spectroscopy, CD and NMR to have a look on the protein structure and NMR and stopped-flow to study the ligand binding properties of the proteins...
October 25, 2018: Journal of Biological Inorganic Chemistry: JBIC
A Zając, L Dymińska, J Lorenc, S M Kaczmarek, G Leniec, M Ptak, J Hanuza
The copper phytate IP6Cu, IP6Cu2 and IP6Cu3 complexes were synthesized changing the phytate to metal mole ratio. The obtained products have been characterized by means of chemical and spectroscopic studies. Spectroscopic ATR/IR, FT-Raman, UV-Vis, EPR and magnetic measurements were carried out. The structures of these compounds have been proposed on the basis of the group theory and geometry optimization taking into account the shape and number of the bands corresponding to the stretching and bending vibrations of the phosphate group and metal-oxygen polyhedron...
October 24, 2018: Journal of Biological Inorganic Chemistry: JBIC
Stephen A Mills, Kiera E Gazica, David L Tierney
Co(II) substitution into the copper amine oxidases (CAOs) has been an effective tool for evaluating the mechanism of oxygen reduction in these enzymes. However, formation of hydrogen peroxide during turnover raises questions about the relevant oxidation state of the cobalt in these enzymes and, therefore, the interpretation of the activity of the metal-substituted enzyme with respect to its mechanism of action. In this study, Co(II) was incorporated into the CAO from Hansenula polymorpha (HPAO). The effect of hydrogen peroxide on the catalytic activity of cobalt-substituted HPAO was evaluated...
October 23, 2018: Journal of Biological Inorganic Chemistry: JBIC
Fengshou Wu, Mengqian Yang, Juan Zhang, Sizhe Zhu, Mengge Shi, Kai Wang
Photodynamic therapy (PDT) is a promising cancer treatment approach with the advantages of low toxicity and noninvasive characteristics. In this study, a series of metalloporphyrin-indomethacin conjugates tethered with poly(ethylene glycol) (PEG) chains were prepared and characterized. The singlet oxygen production of the conjugates was evaluated through 2', 7'-dichlorofluorescin (DCFH) method. Because of the heavy atom effect, the metal porphyrin complexes exhibited the higher singlet oxygen (1 O2 ) quantum yield than that of free base porphyrin...
October 22, 2018: Journal of Biological Inorganic Chemistry: JBIC
Huayu Zheng, Jingxuan He, Jinghui Li, Jing Yang, Martin L Kirk, Linda J Roman, Changjian Feng
Phosphorylation is an important pathway for the regulation of nitric oxide synthase (NOS) at the posttranslational level. However, the molecular underpinnings of NOS regulation by phosphorylations remain unclear to date, mainly because of the problems in making a good amount of active phospho-NOS proteins. Herein, we have established a system in which recombinant rat nNOS holoprotein can be produced with site-specific incorporation of phosphoserine (pSer) at residue 1412, using a specialized bacterial host strain for pSer incorporation...
October 12, 2018: Journal of Biological Inorganic Chemistry: JBIC
Sidhali U Parsekar, Joseph Fernandes, Arnab Banerjee, Om Prakash Chouhan, Sumit Biswas, Manohar Singh, Durga P Mishra, Manjuri Kumar
We report the biological activity of three Cu(II) complexes [Cu(pabt)Cl] (1), [Cu(pma)Cl] (2), and [Cu(pdta)Cl]Cl (3) (pabt = N-(2-mercaptophenyl)-2'-pyridylmethylenimine, pma = N-(2-pyridylmethyl)-2-mercaptoaniline, pdta = 2,2'-di(pyridyl-2-methyleneimine)diphenyl disulfide). 1-3 display four-line EPR multiplet in solution at RT suggesting that these are mononuclear. DNA-binding studies using spectrophotometric titration of these complexes with calf thymus DNA showed binding through intercalation mode which was found to be consistent with the observation of increased viscosity of DNA and quenching of fluorescence of ethidium bromide bound DNA in the presence of these complexes...
October 9, 2018: Journal of Biological Inorganic Chemistry: JBIC
Alison Butler
No abstract text is available yet for this article.
October 4, 2018: Journal of Biological Inorganic Chemistry: JBIC
Chris A E M Spronk, Szymon Żerko, Michał Górka, Wiktor Koźmiński, Benjamin Bardiaux, Barbara Zambelli, Francesco Musiani, Mario Piccioli, Priyanka Basak, Faith C Blum, Ryan C Johnson, Heidi Hu, D Scott Merrell, Michael Maroney, Stefano Ciurli
Helicobacter pylori HypA (HpHypA) is a metallochaperone necessary for maturation of [Ni,Fe]-hydrogenase and urease, the enzymes required for colonization and survival of H. pylori in the gastric mucosa. HpHypA contains a structural Zn(II) site and a unique Ni(II) binding site at the N-terminus. X-ray absorption spectra suggested that the Zn(II) coordination depends on pH and on the presence of Ni(II). This study was performed to investigate the structural properties of HpHypA as a function of pH and Ni(II) binding, using NMR spectroscopy combined with DFT and molecular dynamics calculations...
September 27, 2018: Journal of Biological Inorganic Chemistry: JBIC
Joana Efua Aggrey-Fynn, Nur Basak Surmeli
Hemoproteins are commonly found in nature, and involved in many important cellular processes such as oxygen transport, electron transfer, and catalysis. Rational design of hemoproteins can not only inspire novel biocatalysts but will also lead to a better understanding of structure-function relationships in native hemoproteins. Here, the heme nitric oxide/oxygen-binding protein from Caldanaerobacter subterraneus subsp. tengcongensis (TtH-NOX) is used as a novel scaffold for oxidation biocatalyst design. We show that signaling protein TtH-NOX can be reengineered to catalyze H2 O2 decomposition and oxidation of 2,2'-azino-bis(3-ethylbenzothiazoline-6-sulphonic acid) by H2 O2 ...
September 12, 2018: Journal of Biological Inorganic Chemistry: JBIC
G Y Sánchez Delgado, D Paschoal, H F Dos Santos
Gold complexes are promising compounds used in cancer chemotherapy. Besides their steric features, which enable biomolecule interactions, the redox instability and the high affinity of gold with cellular nucleophiles influence the biological action in these complexes. Both features were herein theoretically investigated for the [Au(C^N^C)Cl] probe complex (C^N^C = 2,6-diphenylpyridine) using H2 O, CH3 SH/CH3 S- , CH3 Se- and meim-4-H (4-methylimidazole) as biomimetic nucleophiles. Based on the results, the lowest energy reaction path followed two consecutive steps: (1) chloride-exchange ([Formula: see text] = 4...
September 12, 2018: Journal of Biological Inorganic Chemistry: JBIC
Gonzalo Scalese, Ignacio Machado, Carolina Fontana, Gastón Risi, Gustavo Salinas, Leticia Pérez-Díaz, Dinorah Gambino
Searching for prospective vanadium-based agents against Trypanosoma cruzi, the parasite causing Chagas disease, four new [VV O(8HQ-H)(L-2H)] compounds, where 8HQ is 8-hydroxyquinoline and L are tridentate salicylaldehyde semicarbazone derivatives L1-L4, were synthesized and characterized in the solid state and in solution. The compounds were evaluated on T. cruzi epimastigotes (CL Brener) as well as on VERO cells, as mammalian cell model. Compounds showed activity against T. cruzi (IC50 6.2-10.5 μM) of the same order than Nifurtimox and 8HQ, and a four- to sevenfold activity increase with respect to the free semicarbazones...
September 8, 2018: Journal of Biological Inorganic Chemistry: JBIC
Sriramya Garapati, William Monteith, Chris Wilson, Anastasiia Kostenko, John M Kenney, Allison S Danell, Colin S Burns
Prothymosin-α is a small, multifunctional intrinsically disordered protein associated with cell survival and proliferation which binds multiple Zn2+ ions and undergoes partial folding. The interaction between prothymosin-α and at least two of its protein targets is significantly enhanced in the presence of Zn2+ ions, suggesting that Zn2+ binding plays a role in the protein's function. The primary sequence of prothymosin-α is highly acidic, with almost 50% comprised of Asp and Glu, and is unusual for a Zn2+ -binding protein as it lacks Cys and His residues...
September 5, 2018: Journal of Biological Inorganic Chemistry: JBIC
Geng Dong, Ulf Ryde
Formate dehydrogenases (FDHs) are metalloenzymes that catalyse the reversible conversion of formate to carbon dioxide. Since such a process may be used to combat the greenhouse effect, FDHs have been extensively studied by experimental and theoretical methods. However, the reaction mechanism is still not clear; instead five putative mechanisms have been suggested. In this work, the reaction mechanism of FDH was studied by computational methods. Combined quantum mechanical and molecular mechanic (QM/MM) optimisations were performed to obtain the geometries...
September 1, 2018: Journal of Biological Inorganic Chemistry: JBIC
Daphne S Cukierman, Elio Accardo, Rosana Garrido Gomes, Anna De Falco, Marco C Miotto, Maria Clara Ramalho Freitas, Mauricio Lanznaster, Claudio O Fernández, Nicolás A Rey
With the increasing life expectancy of the world's population, neurodegenerative diseases, such as Alzheimer's disease (AD), will become a much more relevant public health issue. This fact, coupled with the lack of efficacy of the available treatments, has been driving research directed to the development of new drugs for this pathology. Metal-protein attenuating compounds (MPACs) constitute a promising class of agents with potential application on the treatment of neurodegenerative diseases, such as AD. Currently, most MPACs are based on 8-hydroxyquinoline...
August 25, 2018: Journal of Biological Inorganic Chemistry: JBIC
Cecilia Pozzi, Flavio Di Pisa, Manuela Benvenuti, Stefano Mangani
Recent evidence links the role of human glutaminyl cyclase (hQC) to the amyloidogenic process involved in Alzheimer's disease (AD). hQC is a zinc enzyme present in neuronal tissue and its activity is responsible for the cyclization of N-terminal Gln or Glu β-amyloid peptides, leading to N-pyroglutamic acid peptides (pE-Aβ) that is probably a crucial event in the initiation and progress of the disease. Indeed, pE-containing peptides exhibit an elevated neurotoxicity and a tendency to aggregate. These observations render hQC inhibition an attractive strategy for developing new molecules active against AD...
August 21, 2018: Journal of Biological Inorganic Chemistry: JBIC
Geoffrey A Heinzl, Weiliang Huang, Elizabeth Robinson, Fengtian Xue, Pierre Möene-Loccoz, Angela Wilks
In the original publication, fifth author's name was incorrectly published as Pierre Moenne-Loccoz.
October 2018: Journal of Biological Inorganic Chemistry: JBIC
Hiroaki Naka, Zachary L Reitz, Aneta M Jelowicki, Alison Butler, Margo G Haygood
In the original publication, third author's name was incorrectly published as Aneta L. Jelowicki.
October 2018: Journal of Biological Inorganic Chemistry: JBIC
Darcy L McRose, Mohammad R Seyedsayamdost, François M M Morel
It is common for bacteria to produce chemically diverse sets of small Fe-binding molecules called siderophores. Studies of siderophore bioinorganic chemistry have firmly established the role of these molecules in Fe uptake and provided great insight into Fe complexation. However, we still do not fully understand why microbes make so many siderophores. In many cases, the release of small structural variants or siderophore fragments has been ignored, or considered as an inefficiency of siderophore biosynthesis...
October 2018: Journal of Biological Inorganic Chemistry: JBIC
Masanori Sono, Shengfang Sun, Anuja Modi, Mark S Hargrove, Bastian Molitor, Nicole Frankenberg-Dinkel, John H Dawson
The binding of neutral thiol (ethanethiol, EtSH) or thioether (tetrahydrothiophene, THT) to two types of heme proteins in their ferrous state has been investigated with UV-visible (UV-Vis) absorption and magnetic circular dichroism spectroscopy. For the second GAF (cGMP-specific phosphodiesterases, adenylyl cyclases, and FhlA) domain from the sensory kinase MsmS (sGAF2), stepwise additions of these respective two sulfur-donor ligands to its dithionite-reduced ferrous form generate homogeneous six-coordinate low-spin ferrous complexes at both pHs 7...
October 2018: Journal of Biological Inorganic Chemistry: JBIC
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