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https://www.readbyqxmd.com/read/28545065/influence-of-the-ferric-uptake-regulator-fur-protein-on-pathogenicity-in-pectobacterium-carotovorum-subsp-brasiliense
#1
Collins Kipngetich Tanui, Divine Yutefar Shyntum, Stefan Louis Priem, Jacques Theron, Lucy Novungayo Moleleki
Iron is an important nutrient for the survival and growth of many organisms. In order to survive, iron uptake from the environment must be strictly regulated and maintained to avoid iron toxicity. The ferric uptake regulator protein (Fur) regulates genes involved in iron homeostasis in many bacteria, including phytopathogens. However, to date, the role played by Fur in the biology of Pectobacterium carotovorum subsp. brasiliense (Pcb1692), an important pathogen of potatoes, has not yet been studied. To this end, we used the lambda recombineering method to generate a fur mutant strain of Pcb1692 and assessed the virulence and fitness of the mutant strain...
2017: PloS One
https://www.readbyqxmd.com/read/28542620/elevated-catalase-expression-in-a-fungal-pathogen-is-a-double-edged-sword-of-iron
#2
Arnab Pradhan, Carmen Herrero-de-Dios, Rodrigo Belmonte, Susan Budge, Angela Lopez Garcia, Aljona Kolmogorova, Keunsook K Lee, Brennan D Martin, Antonio Ribeiro, Attila Bebes, Raif Yuecel, Neil A R Gow, Carol A Munro, Donna M MacCallum, Janet Quinn, Alistair J P Brown
Most fungal pathogens of humans display robust protective oxidative stress responses that contribute to their pathogenicity. The induction of enzymes that detoxify reactive oxygen species (ROS) is an essential component of these responses. We showed previously that ectopic expression of the heme-containing catalase enzyme in Candida albicans enhances resistance to oxidative stress, combinatorial oxidative plus cationic stress, and phagocytic killing. Clearly ectopic catalase expression confers fitness advantages in the presence of stress, and therefore in this study we tested whether it enhances fitness in the absence of stress...
May 22, 2017: PLoS Pathogens
https://www.readbyqxmd.com/read/28535164/meat-dietary-heme-iron-and-risk-of-type-2-diabetes-the-singapore-chinese-health-study
#3
Mohammad Talaei, Ye-Li Wang, Jian-Min Yuan, An Pan, Woon-Puay Koh
We evaluated the relations of red meat, poultry, fish and shellfish, as well as heme iron intake, with risk of type 2 diabetes (T2D).The Singapore Chinese Health Study is a population-based cohort that recruited 63,257 Chinese adults aged 45-74 years from 1993 to 1998. Usual diet was evaluated by a validated 165-item semi-quantitative food-frequency questionnaire at recruitment. Physician-diagnosed T2D was self-reported during two follow-up interviews in 1999-2004 and 2006-2010. During a mean follow-up of 10...
May 23, 2017: American Journal of Epidemiology
https://www.readbyqxmd.com/read/28526789/a-novel-iron-dependent-enzyme-that-catalyzes-the-initial-step-in-the-biodegradation-of-n-nitroglycine-by-variovorax-sp-strain-js1663
#4
Kristina M Mahan, Hangping Zheng, Tekle T Fida, Ronald J Parry, David E Graham, Jim C Spain
Nitramines are key constituents of most of the explosives in current use and consequently contaminate soil and groundwater at many military facilities around the world. Toxicity from nitramine contamination poses a health risk to plants and animals, thus understanding how nitramines are biodegraded is critical to environmental remediation. The biodegradation of synthetic nitramine compounds such as hexahydro-1,3,5-trinitro-1,3,5- triazine (RDX) has been studied for decades, but little is known about the catabolism of naturally produced nitramine compounds...
May 19, 2017: Applied and Environmental Microbiology
https://www.readbyqxmd.com/read/28522117/characterization-of-cu-ii-reconstituted-acc-oxidase-using-experimental-and-theoretical-approaches
#5
Nadia El Bakkali-Tahéri, Sybille Tachon, Maylis Orio, Sylvain Bertaina, Marlène Martinho, Viviane Robert, Marius Réglier, Thierry Tron, Pierre Dorlet, A Jalila Simaan
1-Aminocyclopropane-1-carboxylic acid oxidase (ACCO) is a non heme iron(II) containing enzyme that catalyzes the final step of the ethylene biosynthesis in plants. The iron(II) ion is bound in a facial triad composed of two histidines and one aspartate (H177, D179 and H234). Several active site variants were generated to provide alternate binding motifs and the enzymes were reconstituted with copper(II). Continuous wave (cw) and pulsed Electron Paramagnetic Resonance (EPR) spectroscopies as well as Density Functional Theory (DFT) calculations were performed and models for the copper(II) binding sites were deduced...
May 15, 2017: Archives of Biochemistry and Biophysics
https://www.readbyqxmd.com/read/28521711/mini-heme-proteins-designability-of-structure-and-diversity-of-functions
#6
Jagdish Rai
Natural heme proteins may have heme bound to poly-peptide chain as a cofactor via non-covalent forces or heme as a prosthetic group may be covalently bound to the proteins. Nature has used porphyrins in diverse functions like electron transfer, oxidation, reduction, ligand binding, photosynthesis, signaling, etc. by modulating its properties through diverse protein matrices. Synthetic chemists have tried to utilize these molecules in equally diverse industrial and medical applications due to their versatile electro-chemical and optical properties...
May 15, 2017: Current Protein & Peptide Science
https://www.readbyqxmd.com/read/28515647/comparative-study-on-compositions-and-functional-properties-of-porcine-chicken-and-duck-blood
#7
Supaluk Sorapukdee, Supawadee Narunatsopanon
Hematological, chemical and functional characteristics of porcine, chicken and duck blood were evaluated. A porcine blood sample showed the most abundant red blood cell, hemoglobin concentration, packed cell volume and plasma protein content as well as its freeze-dried blood possessed the highest contents of protein, fat, Cu and Cr with the highest percentage of heme iron (p<0.05). Unlike porcine blood, chicken blood showed a well balance in some essential amino acids, specifically for a higher isoleucine content (p<0...
2017: Korean Journal for Food Science of Animal Resources
https://www.readbyqxmd.com/read/28515173/heme-oxygenase-1-mitigates-ferroptosis-in-renal-proximal-tubule-cells
#8
Oreoluwa Adedoyin, Ravindra Boddu, Amie M Traylor, Jeremie M Lever, Subhashini Bolisetty, James George, Anupam Agarwal
Ferroptosis is an iron-dependent form of regulated, non-apoptotic cell death, which contributes to damage in models of acute kidney injury (AKI). Heme oxygenase-1 (HO-1) is a cytoprotective enzyme induced in response to cellular stress, and is protective against AKI due to its anti-apoptotic and anti-inflammatory properties. However, the role of HO-1 in regulating ferroptosis is unclear. The purpose of this study was to elucidate the role of HO-1 in regulating ferroptotic cell death in renal proximal tubule cells (PTCs)...
May 17, 2017: American Journal of Physiology. Renal Physiology
https://www.readbyqxmd.com/read/28510056/the-two-sides-of-a-lipid-protein-story
#9
REVIEW
Luis G Mansor Basso, Luis F Santos Mendes, Antonio J Costa-Filho
Protein-membrane interactions play essential roles in a variety of cell functions such as signaling, membrane trafficking, and transport. Membrane-recruited cytosolic proteins that interact transiently and interfacially with lipid bilayers perform several of those functions. Experimental techniques capable of probing changes on the structural dynamics of this weak association are surprisingly limited. Among such techniques, electron spin resonance (ESR) has the enormous advantage of providing valuable local information from both membrane and protein perspectives by using intrinsic paramagnetic probes in metalloproteins or by attaching nitroxide spin labels to proteins and lipids...
June 2016: Biophysical Reviews
https://www.readbyqxmd.com/read/28503569/postneonatal-mortality-and-liver-changes-in-cloned-pigs-associated-with-human-tumor-necrosis-factor-receptor-i-fc-and-human-heme-oxygenase-1-overexpression
#10
Geon A Kim, Jun-Xue Jin, Sanghoon Lee, Anukul Taweechaipaisankul, Hyun Ju Oh, Joing-Ik Hwang, Curie Ahn, Islam M Saadeldin, Byeong Chun Lee
Soluble human tumor necrosis factor (shTNFRI-Fc) and human heme oxygenase 1 (hHO-1) are key regulators for protection against oxidative and inflammatory injury for xenotransplantation. Somatic cells with more than 10 copy numbers of shTNFRI-Fc and hHO-1 were employed in somatic cell nuclear transfer to generate cloned pigs, thereby resulting in seven cloned piglets. However, produced piglets were all dead within 24 hours after birth. Obviously, postnatal death with liver apoptosis was reported in the higher copy number of shTNFRI-Fc and hHO-1 piglets...
2017: BioMed Research International
https://www.readbyqxmd.com/read/28501743/antarctic-fish-versus-human-cytoglobins-the-same-but-yet-so-different
#11
Bert Cuypers, Stijn Vermeylen, Dietmar Hammerschmid, Stanislav Trashin, Vanoushe Rahemi, Albert Konijnenberg, Amy De Schutter, C-H Christina Cheng, Daniela Giordano, Cinzia Verde, Karolien De Wael, Frank Sobott, Sylvia Dewilde, Sabine Van Doorslaer
The cytoglobins of the Antarctic fish Chaenocephalus aceratus and Dissostichus mawsoni have many features in common with human cytoglobin. These cytoglobins are heme proteins in which the ferric and ferrous forms have a characteristic hexacoordination of the heme iron, i.e. axial ligation of two endogenous histidine residues, as confirmed by electron paramagnetic resonance, resonance Raman and optical absorption spectroscopy. The combined spectroscopic analysis revealed only small variations in the heme-pocket structure, in line with the small variations observed for the redox potential...
April 28, 2017: Journal of Inorganic Biochemistry
https://www.readbyqxmd.com/read/28500577/pectin-esterification-degree-in-the-bioavailability-of-non-heme-iron-in-women
#12
Angela Jaramillo, Paulina Molina, Lautaro Briones, Sebastián Flores, Manuel Olivares, Fernando Pizarro
Pectins are a type of soluble fiber present in natural and processed foods. Evidence regarding the effect of esterification degree of pectins on iron absorption in humans is scarce. In the present study, the effect of pectins with different degrees of esterification on non-heme iron absorption in women was evaluated. A controlled experimental study was conducted with block design, involving 13 apparently healthy, adult women. Each subject received 5 mg Fe (FeSO4) without pectin (control) or accompanied by 5 g citrus pectin, two with a low degree of esterification (27 and 36%), and one with a high degree of esterification (67 to 73%), each on different days...
May 12, 2017: Biological Trace Element Research
https://www.readbyqxmd.com/read/28495915/extracellular-glycine-is-necessary-for-optimal-hemoglobinization-of-erythroid-cells
#13
Daniel Garcia-Santos, Matthias Schranzhofer, Richard Bergeron, Alex D Sheftel, Prem Ponka
Vertebrate heme synthesis requires three substrates: succinyl-CoA, which regenerates in the tricarboxylic acid cycle, iron and glycine. For each heme molecule synthesized, one atom of iron and eight molecules of glycine are needed. Inadequate delivery of iron to immature erythroid cells leads to a decreased production of heme, but virtually nothing is known about the consequence of an insufficient supply of extracellular glycine on the process of hemoglobinization. To address this issue, we exploited mice in which the gene encoding glycine transporter 1 (GlyT1) was disrupted...
May 11, 2017: Haematologica
https://www.readbyqxmd.com/read/28495446/mechanism-of-hrp-catalyzed-nitrite-oxidation-by-h2o2-revisited-effect-of-nitroxides-on-enzyme-inactivation-and-its-catalytic-activity
#14
Amram Samuni, Eric Maimon, Sara Goldstein
The peroxidative activity of horseradish peroxidase (HRP) undergoes progressive inactivation while catalyzing the oxidation of nitrite by H2O2. The extent of inactivation increases as the pH increases, [nitrite] decreases or [H2O2] increases, and is accompanied by a loss of the Soret peak of HRP along with yellow-greenish coloration of the solution. HRP-catalyzed nitrite oxidation by H2O2 involves not only the formation of compounds I and II as transient heme species, but also compound III, all of which in turn, oxidize nitrite yielding (•)NO2...
May 8, 2017: Free Radical Biology & Medicine
https://www.readbyqxmd.com/read/28493664/structure-and-spectroscopy-of-alkene-cleaving-dioxygenases-containing-an-atypically-coordinated-non-heme-iron-center
#15
Xuewu Sui, Andrew C Weitz, Erik R Farquhar, Mohsen Badiee, Surajit Banerjee, Johannes von Lintig, Gregory Tochtrop, Krzysztof Palczewski, Michael P Hendrich, Philip D Kiser
Carotenoid cleavage oxygenases (CCOs) are non-heme iron enzymes that catalyze scission of alkene groups in carotenoids and stilbenoids to form biologically important products. CCOs possess a rare 4-His iron center whose resting-state structure and interaction with substrates are incompletely understood. Here, we address this knowledge gap through a comprehensive structural and spectroscopic study of three phyletically diverse CCOs. The crystal structure of a fungal stilbenoid-cleaving CCO, CAO1, reveals strong similarity between its iron center and those of carotenoid-cleaving CCOs, but with a markedly different substrate-binding cleft...
May 11, 2017: Biochemistry
https://www.readbyqxmd.com/read/28493482/emergence-of-cytochrome-bc-complexes-in-the-context-of-photosynthesis
#16
Daria V Dibrova, Daria N Shalaeva, Michael Y Galperin, Armen Y Mulkidjanian
The cytochrome bc complexes are involved in Q-cycling; they oxidize membrane quinols by high-potential electron acceptors, such as cytochromes or plastocyanin, and generate transmembrane proton gradient. In several prokaryotic lineages, and also in plant chloroplasts, the catalytic core of the cytochrome bc complexes is built of a four-helical cytochrome b that contains three hemes, a three-helical subunit IV, and an iron-sulfur Rieske protein (cytochrome b6 f-type complexes). In other prokaryotic lineages, and also in mitochondria, the cytochrome b subunit is fused with subunit IV, yielding a seven- or eight-helical cytochrome b with only two hemes (cytochrome bc1 -type complexes)...
May 11, 2017: Physiologia Plantarum
https://www.readbyqxmd.com/read/28487287/mortality-from-different-causes-associated-with-meat-heme-iron-nitrates-and-nitrites-in-the-nih-aarp-diet-and-health-study-population-based-cohort-study
#17
Arash Etemadi, Rashmi Sinha, Mary H Ward, Barry I Graubard, Maki Inoue-Choi, Sanford M Dawsey, Christian C Abnet
Objective To determine the association of different types of meat intake and meat associated compounds with overall and cause specific mortality.Design Population based cohort study.Setting Baseline dietary data of the NIH-AARP Diet and Health Study (prospective cohort of the general population from six states and two metropolitan areas in the US) and 16 year follow-up data until 31 December 2011.Participants 536 969 AARP members aged 50-71 at baseline.Exposures Intake of total meat, processed and unprocessed red meat (beef, lamb, and pork) and white meat (poultry and fish), heme iron, and nitrate/nitrite from processed meat based on dietary questionnaire...
May 9, 2017: BMJ: British Medical Journal
https://www.readbyqxmd.com/read/28485415/prebiotics-increase-heme-iron-bioavailability-and-do-not-affect-non-heme-iron-bioavailability-in-humans
#18
Valerie Weinborn, Carolina Valenzuela, Manuel Olivares, Miguel Arredondo, Ricardo Weill, Fernando Pizarro
The aim of this study was to establish the effect of a prebiotic mix on heme and non-heme iron (Fe) bioavailability in humans. To this purpose, twenty-four healthy women were randomized into one of two study groups. One group ate one yogurt per day for 12 days with a prebiotic mix (prebiotic group) and the other group received the same yogurt but without the prebiotic mix (control group). Before and after the intake period, the subjects participated in Fe absorption studies. These studies used (55)Fe and (59)Fe radioactive isotopes as markers of heme Fe and non-heme Fe, respectively, and Fe absorption was measured by the incorporation of radioactive Fe into erythrocytes...
May 24, 2017: Food & Function
https://www.readbyqxmd.com/read/28484165/biology-of-sideroblastic-anemia
#19
Hideo Harigae
Sideroblastic anemia is characterized by anemia with ring sideroblasts produced by the bone marrow. Sideroblasts are formed by disutilization and deposit of iron in the mitochondoria. There are two forms of sideroblastic anemia: congenital and acquired. Congenital sideroblastic anemia is caused by mutations in genes involved in heme biosynthesis, iron-sulfur (Fe-S) cluster biogenesis, or mitochondrial metabolism. Although there is a variation in the mutated genes among races, the most common congenital sideroblastic anemia is X-linked sideroblastic anemia caused by mutations in the erythroid-specific δ-aminolevulinate synthase gene, which is the first enzyme of heme biosynthesis in erythroid cells...
2017: [Rinshō Ketsueki] the Japanese Journal of Clinical Hematology
https://www.readbyqxmd.com/read/28482712/heme-mediated-cell-activation-the-inflammatory-puzzle-of-sickle-cell-anemia
#20
Caroline Conceição da Guarda, Rayra Pereira Santiago, Luciana Magalhães Fiuza, Milena Magalhães Aleluia, Júnia Raquel Dutra Ferreira, Camylla Vilas Boas Figueiredo, Setondji Cocou Modeste Alexandre Yahouedehou, Rodrigo Mota de Oliveira, Isa Menezes Lyra, Marilda de Souza Gonçalves
Hemolysis triggers the onset of several clinical manifestations of sickle cell anemia (SCA). During hemolysis, heme, which is derived from hemoglobin (Hb), accumulates due to the inability of detoxification systems to scavenge sufficiently. Heme exerts multiple harmful effects, including leukocyte activation and migration, enhanced adhesion molecule expression by endothelial cells and the production of pro-oxidant molecules. Area covered: In this review, we describe the effects of heme on leukocytes and endothelial cells, as well as the features of vascular endothelial cells related to vaso-occlusion in SCA...
May 17, 2017: Expert Review of Hematology
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