1
|
Abstract
In addition to economic and infrastructural factors, social connections of people also influence migration patterns. This influence can be attributed to the resources that are made available by social contacts: social capital, which can also be utilized in the process of migration. Based on previous literature, we identify three different aspects of social capital and test their relationship with domestic migration simultaneously. First, we analyse if the intensity of connections within communities (local social capital) restrains from migration. Second, if the intensity of connections between two communities (bridging social capital) is associated with increased migration between them. Finally, we consider, if the extent to which local community networks exhibit open or closed structures (bonding social capital) contributes to higher or lower migration rates. We create indicators for these measures using archived online social network data, covering 40% of the adult population of Hungary, and combine them with official migration data of 175 subregions. Based on point-to-point gravity and negative binomial models, we find that bridging social capital between subregions is associated with increased migration flows, but we do not find that local social capital restrains from migration.
Collapse
Affiliation(s)
- László Lőrincz
- NeTI Lab, Corvinus Institute for Advanced Studies, Corvinus University of Budapest, Budapest, Hungary. .,Centre for Economic and Regional Studies, Institute for Economics, Budapest, Hungary.
| | - Brigitta Németh
- grid.424949.60000 0001 1704 1923Centre for Economic and Regional Studies, Institute for Economics, Budapest, Hungary
| |
Collapse
|
2
|
Steward KF, Payne D, Kincannon W, Johnson C, Lensing M, Fausset H, Németh B, Shepard EM, Broderick WE, Broderick JB, Dubois J, Bothner B. Proteomic Analysis of Methanococcus voltae Grown in the Presence of Mineral and Nonmineral Sources of Iron and Sulfur. Microbiol Spectr 2022; 10:e0189322. [PMID: 35876569 PMCID: PMC9431491 DOI: 10.1128/spectrum.01893-22] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/24/2022] [Accepted: 06/17/2022] [Indexed: 11/28/2022] Open
Abstract
Iron sulfur (Fe-S) proteins are essential and ubiquitous across all domains of life, yet the mechanisms underpinning assimilation of iron (Fe) and sulfur (S) and biogenesis of Fe-S clusters are poorly understood. This is particularly true for anaerobic methanogenic archaea, which are known to employ more Fe-S proteins than other prokaryotes. Here, we utilized a deep proteomics analysis of Methanococcus voltae A3 cultured in the presence of either synthetic pyrite (FeS2) or aqueous forms of ferrous iron and sulfide to elucidate physiological responses to growth on mineral or nonmineral sources of Fe and S. The liquid chromatography-mass spectrometry (LCMS) shotgun proteomics analysis included 77% of the predicted proteome. Through a comparative analysis of intra- and extracellular proteomes, candidate proteins associated with FeS2 reductive dissolution, Fe and S acquisition, and the subsequent transport, trafficking, and storage of Fe and S were identified. The proteomic response shows a large and balanced change, suggesting that M. voltae makes physiological adjustments involving a range of biochemical processes based on the available nutrient source. Among the proteins differentially regulated were members of core methanogenesis, oxidoreductases, membrane proteins putatively involved in transport, Fe-S binding ferredoxin and radical S-adenosylmethionine proteins, ribosomal proteins, and intracellular proteins involved in Fe-S cluster assembly and storage. This work improves our understanding of ancient biogeochemical processes and can support efforts in biomining of minerals. IMPORTANCE Clusters of iron and sulfur are key components of the active sites of enzymes that facilitate microbial conversion of light or electrical energy into chemical bonds. The proteins responsible for transporting iron and sulfur into cells and assembling these elements into metal clusters are not well understood. Using a microorganism that has an unusually high demand for iron and sulfur, we conducted a global investigation of cellular proteins and how they change based on the mineral forms of iron and sulfur. Understanding this process will answer questions about life on early earth and has application in biomining and sustainable sources of energy.
Collapse
Affiliation(s)
- Katherine F. Steward
- Department of Chemistry and Biochemistry, Montana State University, Bozeman, Montana, USA
| | - Devon Payne
- Department of Microbiology and Cell Biology, Montana State University, Bozeman, Montana, USA
| | - Will Kincannon
- Department of Chemistry and Biochemistry, Montana State University, Bozeman, Montana, USA
| | - Christina Johnson
- Department of Chemistry and Biochemistry, Montana State University, Bozeman, Montana, USA
| | - Malachi Lensing
- Department of Chemistry and Biochemistry, Montana State University, Bozeman, Montana, USA
| | - Hunter Fausset
- Department of Chemistry and Biochemistry, Montana State University, Bozeman, Montana, USA
| | - Brigitta Németh
- Department of Chemistry and Biochemistry, Montana State University, Bozeman, Montana, USA
| | - Eric M. Shepard
- Department of Chemistry and Biochemistry, Montana State University, Bozeman, Montana, USA
| | - William E. Broderick
- Department of Chemistry and Biochemistry, Montana State University, Bozeman, Montana, USA
| | - Joan B. Broderick
- Department of Chemistry and Biochemistry, Montana State University, Bozeman, Montana, USA
| | - Jen Dubois
- Department of Chemistry and Biochemistry, Montana State University, Bozeman, Montana, USA
| | - Brian Bothner
- Department of Chemistry and Biochemistry, Montana State University, Bozeman, Montana, USA
| |
Collapse
|
3
|
Németh B, Miklósi M. Children’s externalizing and internalizing symptoms and their involvement in decision-making. Eur Psychiatry 2022. [PMCID: PMC9567685 DOI: 10.1192/j.eurpsy.2022.1809] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/23/2022] Open
Abstract
Introduction
The involvement of children in decision making processes was shown to have beneficial effects on their cognitive, emotional, and social development. However, no research focused on its association with child’s psychopathology.
Objectives
Our research aimed to explore the relationships between children’s externalizing and internalizing symptoms and their involvement in decision making in a dimensional approach.
Methods
A community sample of 318 parents (64.2% mothers, mean age: 39.48 years SD=5.82) filled out an online questionnaire including the Decision-Making Involvement Scale (DMIS) assessing the parent’s and child’s behaviour in decision-making processes and the Strength and Difficulties Questionnaire (SDQ). Linear regression analyses were conducted for exploring multivariate associations of DMIS Parent and Child subscales with child’s psychopathology and prosocial behaviour, controlling for child’s gender and age.
Results
With SDQ Internalizing problems subscale as dependent, linear regression analysis did not result in a significant model. In a significant model explaining 21.2% of the variance of the dependent variable, SDQ Externalizing problems score were significantly related to child’s age and gender, and to both Child and Parent subscales of the DMIS. When choosing SDQ Prosocial behaviour subscale as dependent, child’s gender and DMIS Child subscale were significantly associated to the dependent variables, accounting for 12.2% of the variance.
Conclusions
Our results suggest that children’s involvement in decisions may be related to less externalizing symptoms and higher levels of prosocial skills. However, longitudinal research is needed to uncover the direction of the relationship and underlying mechanisms.
Disclosure
No significant relationships.
Collapse
|
4
|
Mosztbacher D, Hanák L, Farkas N, Szentesi A, Mikó A, Bajor J, Sarlós P, Czimmer J, Vincze î, Hegyi P, Eross B, Takács T, Czakó L, Németh B, Izbéki F, Halász A, Gajdán L, Hamvas J, Papp M, Földi I, Fehér K, Varga M, Csefkó K, Török I, Hunor-Pál F, Mickevicius A, Ramirez Maldonado E, Sallinen V, Novák J, Tüzün Ince A, Galeev S, Bod B, Sümegi J, Pencik P, Dubravcsik Z, Illés D, Gódi S, Kui B, Márta K, Pécsi D, Varjú P, Szakács Z, Darvasi E, Párniczky A, Hegyi P. Hypertriglyceridemia-induced acute pancreatitis: A prospective, multicenter, international cohort analysis of 716 acute pancreatitis cases. Pancreatology 2020. [DOI: 10.1016/j.pan.2020.07.101] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/16/2023]
|
5
|
Land H, Sekretareva A, Huang P, Redman HJ, Németh B, Polidori N, Mészáros LS, Senger M, Stripp ST, Berggren G. Characterization of a putative sensory [FeFe]-hydrogenase provides new insight into the role of the active site architecture. Chem Sci 2020; 11:12789-12801. [PMID: 34094474 PMCID: PMC8163306 DOI: 10.1039/d0sc03319g] [Citation(s) in RCA: 20] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/15/2020] [Accepted: 09/19/2020] [Indexed: 12/12/2022] Open
Abstract
[FeFe]-hydrogenases are known for their high rates of hydrogen turnover, and are intensively studied in the context of biotechnological applications. Evolution has generated a plethora of different subclasses with widely different characteristics. The M2e subclass is phylogenetically distinct from previously characterized members of this enzyme family and its biological role is unknown. It features significant differences in domain- and active site architecture, and is most closely related to the putative sensory [FeFe]-hydrogenases. Here we report the first comprehensive biochemical and spectroscopical characterization of an M2e enzyme, derived from Thermoanaerobacter mathranii. As compared to other [FeFe]-hydrogenases characterized to-date, this enzyme displays an increased H2 affinity, higher activation enthalpies for H+/H2 interconversion, and unusual reactivity towards known hydrogenase inhibitors. These properties are related to differences in active site architecture between the M2e [FeFe]-hydrogenase and "prototypical" [FeFe]-hydrogenases. Thus, this study provides new insight into the role of this subclass in hydrogen metabolism and the influence of the active site pocket on the chemistry of the H-cluster.
Collapse
Affiliation(s)
- Henrik Land
- Molecular Biomimetics, Department of Chemistry, Ångström Laboratory, Uppsala University Box 523 SE-75120 Uppsala Sweden
| | - Alina Sekretareva
- Molecular Biomimetics, Department of Chemistry, Ångström Laboratory, Uppsala University Box 523 SE-75120 Uppsala Sweden
| | - Ping Huang
- Molecular Biomimetics, Department of Chemistry, Ångström Laboratory, Uppsala University Box 523 SE-75120 Uppsala Sweden
| | - Holly J Redman
- Molecular Biomimetics, Department of Chemistry, Ångström Laboratory, Uppsala University Box 523 SE-75120 Uppsala Sweden
| | - Brigitta Németh
- Molecular Biomimetics, Department of Chemistry, Ångström Laboratory, Uppsala University Box 523 SE-75120 Uppsala Sweden
| | - Nakia Polidori
- Molecular Biomimetics, Department of Chemistry, Ångström Laboratory, Uppsala University Box 523 SE-75120 Uppsala Sweden
| | - Lívia S Mészáros
- Molecular Biomimetics, Department of Chemistry, Ångström Laboratory, Uppsala University Box 523 SE-75120 Uppsala Sweden
| | - Moritz Senger
- Physical Chemistry, Department of Chemistry, Ångström Laboratory, Uppsala University Box 523 SE-75120 Uppsala Sweden
- Bioinorganic Spectroscopy, Department of Physics, Freie Universität Berlin Arnimallee 14 DE-14195 Berlin Germany
| | - Sven T Stripp
- Bioinorganic Spectroscopy, Department of Physics, Freie Universität Berlin Arnimallee 14 DE-14195 Berlin Germany
| | - Gustav Berggren
- Molecular Biomimetics, Department of Chemistry, Ångström Laboratory, Uppsala University Box 523 SE-75120 Uppsala Sweden
| |
Collapse
|
6
|
Németh B, Land H, Magnuson A, Hofer A, Berggren G. The maturase HydF enables [FeFe] hydrogenase assembly via transient, cofactor-dependent interactions. J Biol Chem 2020; 295:11891-11901. [PMID: 32620553 PMCID: PMC7450098 DOI: 10.1074/jbc.ra119.011419] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/10/2019] [Revised: 06/25/2020] [Indexed: 12/24/2022] Open
Abstract
[FeFe] hydrogenases have attracted extensive attention in the field of renewable energy research because of their remarkable efficiency for H2 gas production. H2 formation is catalyzed by a biologically unique hexanuclear iron cofactor denoted the H-cluster. The assembly of this cofactor requires a dedicated maturation machinery including HydF, a multidomain [4Fe4S] cluster protein with GTPase activity. HydF is responsible for harboring and delivering a precatalyst to the apo-hydrogenase, but the details of this process are not well understood. Here, we utilize gas-phase electrophoretic macromolecule analysis to show that a HydF dimer forms a transient interaction complex with the hydrogenase and that the formation of this complex depends on the cofactor content on HydF. Moreover, Fourier transform infrared, electron paramagnetic resonance, and UV-visible spectroscopy studies of mutants of HydF show that the isolated iron-sulfur cluster domain retains the capacity for binding the precatalyst in a reversible fashion and is capable of activating apo-hydrogenase in in vitro assays. These results demonstrate the central role of the iron-sulfur cluster domain of HydF in the final stages of H-cluster assembly, i.e. in binding and delivering the precatalyst.
Collapse
Affiliation(s)
- Brigitta Németh
- Department of Chemistry-Ångström Laboratory, Uppsala University, Uppsala, Sweden
| | - Henrik Land
- Department of Chemistry-Ångström Laboratory, Uppsala University, Uppsala, Sweden
| | - Ann Magnuson
- Department of Chemistry-Ångström Laboratory, Uppsala University, Uppsala, Sweden
| | - Anders Hofer
- Department of Medical Biochemistry and Biophysics, Umeå University, Umeå, Sweden
| | - Gustav Berggren
- Department of Chemistry-Ångström Laboratory, Uppsala University, Uppsala, Sweden
| |
Collapse
|
7
|
Németh B, Senger M, Redman HJ, Ceccaldi P, Broderick J, Magnuson A, Stripp ST, Haumann M, Berggren G. [FeFe]-hydrogenase maturation: H-cluster assembly intermediates tracked by electron paramagnetic resonance, infrared, and X-ray absorption spectroscopy. J Biol Inorg Chem 2020; 25:777-788. [PMID: 32661785 PMCID: PMC7399679 DOI: 10.1007/s00775-020-01799-8] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/21/2020] [Accepted: 06/09/2020] [Indexed: 11/25/2022]
Abstract
[FeFe]-hydrogenase enzymes employ a unique organometallic cofactor for efficient and reversible hydrogen conversion. This so-called H-cluster consists of a [4Fe-4S] cubane cysteine linked to a diiron complex coordinated by carbon monoxide and cyanide ligands and an azadithiolate ligand (adt = NH(CH2S)2)·[FeFe]-hydrogenase apo-protein binding only the [4Fe-4S] sub-complex can be fully activated in vitro by the addition of a synthetic diiron site precursor complex ([2Fe]adt). Elucidation of the mechanism of cofactor assembly will aid in the design of improved hydrogen processing synthetic catalysts. We combined electron paramagnetic resonance, Fourier-transform infrared, and X-ray absorption spectroscopy to characterize intermediates of H-cluster assembly as initiated by mixing of the apo-protein (HydA1) from the green alga Chlamydomonas reinhardtii with [2Fe]adt. The three methods consistently show rapid formation of a complete H-cluster in the oxidized, CO-inhibited state (Hox-CO) already within seconds after the mixing. Moreover, FTIR spectroscopy support a model in which Hox-CO formation is preceded by a short-lived Hred'-CO-like intermediate. Accumulation of Hox-CO was followed by CO release resulting in the slower conversion to the catalytically active state (Hox) as well as formation of reduced states of the H-cluster.
Collapse
Affiliation(s)
- Brigitta Németh
- Department of Chemistry, Ångström Laboratory, Molecular Biomimetics, Uppsala University, 75120, Uppsala, Sweden
- Department of Chemistry and Biochemistry, Montana State University, Bozeman, MT, 59717, USA
| | - Moritz Senger
- Physics Department, Molecular Biophysics, Freie Universität Berlin, 14195, Berlin, Germany
- Department of Chemistry, Ångström Laboratory, Physical Chemistry, Uppsala University, 75120, Uppsala, Sweden
| | - Holly J Redman
- Department of Chemistry, Ångström Laboratory, Molecular Biomimetics, Uppsala University, 75120, Uppsala, Sweden
| | - Pierre Ceccaldi
- Department of Chemistry, Ångström Laboratory, Molecular Biomimetics, Uppsala University, 75120, Uppsala, Sweden
| | - Joan Broderick
- Department of Chemistry and Biochemistry, Montana State University, Bozeman, MT, 59717, USA
| | - Ann Magnuson
- Department of Chemistry, Ångström Laboratory, Molecular Biomimetics, Uppsala University, 75120, Uppsala, Sweden
| | - Sven T Stripp
- Physics Department, Molecular Biophysics, Freie Universität Berlin, 14195, Berlin, Germany
| | - Michael Haumann
- Physics Department, Biophysics of Metalloenzymes, Freie Universität Berlin, 14195, Berlin, Germany
| | - Gustav Berggren
- Department of Chemistry, Ångström Laboratory, Molecular Biomimetics, Uppsala University, 75120, Uppsala, Sweden.
| |
Collapse
|
8
|
Holá K, Pavliuk MV, Németh B, Huang P, Zdražil L, Land H, Berggren G, Tian H. Carbon Dots and [FeFe] Hydrogenase Biohybrid Assemblies for Efficient Light-Driven Hydrogen Evolution. ACS Catal 2020. [DOI: 10.1021/acscatal.0c02474] [Citation(s) in RCA: 24] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Affiliation(s)
- Kateřina Holá
- Department of Chemistry—Ångström Laboratory, Physical Chemistry, Uppsala University, Box 523, SE 751 20 Uppsala, Sweden
- Regional Centre of Advanced Technologies and Materials, Department of Physical Chemistry, Faculty of Science, Palacký University Olomouc, Šlechtitelů 27, 783 71 Olomouc, Czech Republic
| | - Mariia V. Pavliuk
- Department of Chemistry—Ångström Laboratory, Physical Chemistry, Uppsala University, Box 523, SE 751 20 Uppsala, Sweden
| | - Brigitta Németh
- Department of Chemistry—Ångström Laboratory, Molecular Biomimetic, Uppsala University, Box 523, SE 751 20 Uppsala, Sweden
| | - Ping Huang
- Department of Chemistry—Ångström Laboratory, Molecular Biomimetic, Uppsala University, Box 523, SE 751 20 Uppsala, Sweden
| | - Lukáš Zdražil
- Regional Centre of Advanced Technologies and Materials, Department of Physical Chemistry, Faculty of Science, Palacký University Olomouc, Šlechtitelů 27, 783 71 Olomouc, Czech Republic
| | - Henrik Land
- Department of Chemistry—Ångström Laboratory, Molecular Biomimetic, Uppsala University, Box 523, SE 751 20 Uppsala, Sweden
| | - Gustav Berggren
- Department of Chemistry—Ångström Laboratory, Molecular Biomimetic, Uppsala University, Box 523, SE 751 20 Uppsala, Sweden
| | - Haining Tian
- Department of Chemistry—Ångström Laboratory, Physical Chemistry, Uppsala University, Box 523, SE 751 20 Uppsala, Sweden
| |
Collapse
|
9
|
Vincze E, Pipoly I, Seress G, Preiszner B, Papp S, Németh B, Liker A, Bókony V. Great tits take greater risk toward humans and sparrowhawks in urban habitats than in forests. Ethology 2019. [DOI: 10.1111/eth.12922] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Affiliation(s)
- Ernő Vincze
- MTA‐PE Evolutionary Ecology Research Group University of Pannonia Veszprém Hungary
| | - Ivett Pipoly
- MTA‐PE Evolutionary Ecology Research Group University of Pannonia Veszprém Hungary
| | - Gábor Seress
- Department of Limnology University of Pannonia Veszprém Hungary
| | - Bálint Preiszner
- Balaton Limnological Institute, Centre for Ecological Research Hungarian Academy of Sciences Tihany Hungary
| | - Sándor Papp
- Balaton Uplands National Park Directorate Csopak Hungary
| | - Brigitta Németh
- Centre of Environmental Sciences Eötvös Loránd University Budapest Hungary
| | - András Liker
- MTA‐PE Evolutionary Ecology Research Group University of Pannonia Veszprém Hungary
- Department of Limnology University of Pannonia Veszprém Hungary
| | - Veronika Bókony
- Lendület Evolutionary Ecology Research Group, Plant Protection Institute, Centre for Agricultural Research Hungarian Academy of Sciences Budapest Hungary
| |
Collapse
|
10
|
Fasseeh A, Németh B, Molnár A, Fricke FU, Horváth M, Kóczián K, Götze Á, Kaló Z. A systematic review of the indirect costs of schizophrenia in Europe. Eur J Public Health 2019; 28:1043-1049. [PMID: 30395217 PMCID: PMC6241204 DOI: 10.1093/eurpub/cky231] [Citation(s) in RCA: 20] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022] Open
Abstract
Background Schizophrenia is a chronic disease associated with significant and long-lasting effects on health, and it is also a social and financial burden, not only for patients but also for families, other caregivers, and the wider society. It is essential to conduct the assessment of indirect costs, to understand all the effects of the disease on society. Our aim is to gain a better understanding of the indirect costs of schizophrenia in Europe. Methods We conducted a comprehensive systematic literature review covering EMBASE, Medline, and PsycINFO as well as reviewing Health Technology Assessment databases from different countries. We used a qualitative research synthesis for presenting information, as most of the studies were methodologically diverse, a quantitative analysis would have been impractical. Results Indirect cost adjusted to inflation ranged vastly between studies included in the review from 119 Euros to 62, 034 Euros annually. The average proportion of indirect costs of total costs was 44%. Studies highlighted important cost drivers as age, gender, and disease severity, explaining the variation in costs between treatment and patient groups. Conclusions Regardless of the methodological heterogeneity of the reviewed studies, there was an agreement about the significance of indirect costs of schizophrenia on the society. Considering the relatively high prevalence of schizophrenia in Europe, a need for more cost of illness studies especially from Central Eastern and Southern Europe is suggested.
Collapse
Affiliation(s)
- A Fasseeh
- Syreon Research Institute, Budapest, Hungary.,Eötvös Loránd University (ELTE), Budapest, Hungary
| | - B Németh
- Syreon Research Institute, Budapest, Hungary
| | - A Molnár
- Syreon Research Institute, Budapest, Hungary
| | - F-U Fricke
- Technische Hochschule Nürnberg, Nürnberg, Germany
| | - M Horváth
- Gedeon Richter Plc., Budapest, Hungary
| | - K Kóczián
- Gedeon Richter Plc., Budapest, Hungary
| | - Á Götze
- Gedeon Richter Plc., Budapest, Hungary
| | - Z Kaló
- Syreon Research Institute, Budapest, Hungary.,Eötvös Loránd University (ELTE), Budapest, Hungary
| |
Collapse
|
11
|
Németh B, Esmieu C, Redman HJ, Berggren G. Monitoring H-cluster assembly using a semi-synthetic HydF protein. Dalton Trans 2019; 48:5978-5986. [PMID: 30632592 PMCID: PMC6509880 DOI: 10.1039/c8dt04294b] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/26/2018] [Accepted: 12/21/2018] [Indexed: 11/21/2022]
Abstract
The [FeFe] hydrogenase enzyme interconverts protons and molecular hydrogen with remarkable efficiency. The reaction is catalysed by a unique metallo-cofactor denoted as the H-cluster containing an organometallic dinuclear Fe component, the [2Fe] subsite. The HydF protein delivers a precursor of the [2Fe] subsite to the apo-[FeFe] hydrogenase, thus completing the H-cluster and activating the enzyme. Herein we generate a semi-synthetic form of HydF by loading it with a synthetic low valent dinuclear Fe complex. We show that this semi-synthetic protein is practically indistinguishable from the native protein, and utilize this form of HydF to explore the mechanism of H-cluster assembly. More specifically, we show that transfer of the precatalyst from HydF to the hydrogenase enzyme results in the release of CO, underscoring that the pre-catalyst is a four CO species when bound to HydF. Moreover, we propose that an electron transfer reaction occurs during H-cluster assembly, resulting in an oxidation of the [2Fe] subsite with concomitant reduction of the [4Fe4S] cluster present on the HydF protein.
Collapse
Affiliation(s)
- Brigitta Németh
- Molecular Biomimetics
, Department of Chemistry – Ångström Laboratory
, Uppsala University
,
75120 Uppsala
, Sweden
.
| | - Charlène Esmieu
- Molecular Biomimetics
, Department of Chemistry – Ångström Laboratory
, Uppsala University
,
75120 Uppsala
, Sweden
.
| | - Holly J. Redman
- Molecular Biomimetics
, Department of Chemistry – Ångström Laboratory
, Uppsala University
,
75120 Uppsala
, Sweden
.
| | - Gustav Berggren
- Molecular Biomimetics
, Department of Chemistry – Ångström Laboratory
, Uppsala University
,
75120 Uppsala
, Sweden
.
| |
Collapse
|
12
|
Tian L, Németh B, Berggren G, Tian H. Hydrogen evolution by a photoelectrochemical cell based on a Cu2O-ZnO-[FeFe] hydrogenase electrode. J Photochem Photobiol A Chem 2018. [DOI: 10.1016/j.jphotochem.2018.01.035] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
|
13
|
Duzs Á, Tóth A, Németh B, Balogh T, Kós PB, Rákhely G. A novel enzyme of type VI sulfide:quinone oxidoreductases in purple sulfur photosynthetic bacteria. Appl Microbiol Biotechnol 2018; 102:5133-5147. [PMID: 29680900 DOI: 10.1007/s00253-018-8973-x] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/22/2017] [Revised: 02/23/2018] [Accepted: 03/28/2018] [Indexed: 11/24/2022]
Abstract
Sulfide detoxification can be catalyzed by ancient membrane-bound flavoproteins, sulfide:quinone oxidoreductases (Sqr), which have important roles in sulfide homeostasis and sulfide-dependent energy conservation processes by transferring electrons from sulfide to respiratory or photosynthetic membrane electron flow. Sqr enzymes have been categorized into six groups. Several members of the groups I, II, III, and V are well-known, but type IV and VI Sqrs are, as yet, uncharacterized or hardly characterized at all. Here, we report detailed characterization of a type VI sulfide:quinone oxidoreductase (TrSqrF) from a purple sulfur bacterium, Thiocapsa roseopersicina. Phylogenetic analysis classified this enzyme in a special group composed of SqrFs of endosymbionts, while a weaker relationship could be observed with SqrF of Chlorobaculum tepidum which is the only type VI enzyme characterized so far. Directed mutagenesis experiments showed that TrSqrF contributed substantially to the sulfide:quinone oxidoreductase activity of the membranes. Expression of the sqrF gene could be induced by sulfide. Homologous recombinant TrSqrF protein was expressed and purified from the membranes of a SqrF-deleted T. roseopersicina strain. The purified protein contains redox-active covalently bound FAD cofactor. The recombinant TrSqrF enzyme catalyzes sulfur-dependent quinone reduction and prefers ubiquinone-type quinone compounds. Kinetic parameters of TrSqrF show that the affinity of the enzyme is similar to duroquinone and decylubiquinone, but the reaction has substantially lower activation energy with decylubiquinone, indicating that the quinone structure has an effect on the catalytic process. TrSqrF enzyme affinity for sulfide is low, therefore, in agreement with the gene expressional analyis, SqrF could play a role in energy-conserving sulfide oxidation at high sulfide concentrations. TrSqrF is a good model enzyme for the subgroup of type VI Sqrs of endosymbionts and its characterization might provide deeper insight into the molecular details of the ancient, anoxic, energy-gaining processes using sulfide as an electron donor.
Collapse
Affiliation(s)
- Ágnes Duzs
- Department of Biotechnology, University of Szeged, Közép fasor 52, Szeged, 6726, Hungary.,Institute of Biophysics, Biological Research Centre, Hungarian Academy of Sciences, Temesvári krt 62, Szeged, 6726, Hungary
| | - András Tóth
- Department of Biotechnology, University of Szeged, Közép fasor 52, Szeged, 6726, Hungary.,Institute of Biophysics, Biological Research Centre, Hungarian Academy of Sciences, Temesvári krt 62, Szeged, 6726, Hungary
| | - Brigitta Németh
- Institute of Biophysics, Biological Research Centre, Hungarian Academy of Sciences, Temesvári krt 62, Szeged, 6726, Hungary
| | - Tímea Balogh
- Department of Biotechnology, University of Szeged, Közép fasor 52, Szeged, 6726, Hungary
| | - Péter B Kós
- Department of Biotechnology, University of Szeged, Közép fasor 52, Szeged, 6726, Hungary.,Institute of Plant Biology, Biological Research Centre, Hungarian Academy of Sciences, Temesvári krt 62, Szeged, 6726, Hungary
| | - Gábor Rákhely
- Department of Biotechnology, University of Szeged, Közép fasor 52, Szeged, 6726, Hungary. .,Institute of Biophysics, Biological Research Centre, Hungarian Academy of Sciences, Temesvári krt 62, Szeged, 6726, Hungary.
| |
Collapse
|
14
|
Mészáros LS, Németh B, Esmieu C, Ceccaldi P, Berggren G. In Vivo EPR Characterization of Semi-Synthetic [FeFe] Hydrogenases. Angew Chem Int Ed Engl 2018; 57:2596-2599. [PMID: 29334424 PMCID: PMC6282530 DOI: 10.1002/anie.201710740] [Citation(s) in RCA: 24] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/18/2017] [Revised: 12/18/2018] [Indexed: 01/18/2023]
Abstract
EPR spectroscopy reveals the formation of two different semi-synthetic hydrogenases in vivo. [FeFe] hydrogenases are metalloenzymes that catalyze the interconversion of molecular hydrogen and protons. The reaction is catalyzed by the H-cluster, consisting of a canonical iron-sulfur cluster and an organometallic [2Fe] subsite. It was recently shown that the enzyme can be reconstituted with synthetic cofactors mimicking the composition of the [2Fe] subsite, resulting in semi-synthetic hydrogenases. Herein, we employ EPR spectroscopy to monitor the formation of two such semi-synthetic enzymes in whole cells. The study provides the first spectroscopic characterization of semi-synthetic hydrogenases in vivo, and the observation of two different oxidized states of the H-cluster under intracellular conditions. Moreover, these findings underscore how synthetic chemistry can be a powerful tool for manipulation and examination of the hydrogenase enzyme under in vivo conditions.
Collapse
Affiliation(s)
- Lívia S. Mészáros
- Department of Chemistry—Uppsala UniversityLägerhyddsvägen 175120UppsalaSweden
| | - Brigitta Németh
- Department of Chemistry—Uppsala UniversityLägerhyddsvägen 175120UppsalaSweden
| | - Charlène Esmieu
- Department of Chemistry—Uppsala UniversityLägerhyddsvägen 175120UppsalaSweden
| | - Pierre Ceccaldi
- Department of Chemistry—Uppsala UniversityLägerhyddsvägen 175120UppsalaSweden
| | - Gustav Berggren
- Department of Chemistry—Uppsala UniversityLägerhyddsvägen 175120UppsalaSweden
| |
Collapse
|
15
|
Affiliation(s)
- Lívia S. Mészáros
- Department of Chemistry-; Uppsala University; Lägerhyddsvägen 1 75120 Uppsala Sweden
| | - Brigitta Németh
- Department of Chemistry-; Uppsala University; Lägerhyddsvägen 1 75120 Uppsala Sweden
| | - Charlène Esmieu
- Department of Chemistry-; Uppsala University; Lägerhyddsvägen 1 75120 Uppsala Sweden
| | - Pierre Ceccaldi
- Department of Chemistry-; Uppsala University; Lägerhyddsvägen 1 75120 Uppsala Sweden
| | - Gustav Berggren
- Department of Chemistry-; Uppsala University; Lägerhyddsvägen 1 75120 Uppsala Sweden
| |
Collapse
|
16
|
Lόránd V, Kisné Bálint Z, Komjáti D, Németh B, Minier T, Kumánovics G, Farkas N, Jakabné Hamar A, Czirják L, Varjú C. SAT0480 Validation of Articular Disease Activity Indices in Systemic Sclerosis. Ann Rheum Dis 2015. [DOI: 10.1136/annrheumdis-2015-eular.3875] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022]
|
17
|
Tiszlavicz Z, Somogyvári F, Szolnoki Z, Sztriha LK, Németh B, Vécsei L, Mándi Y. Genetic polymorphisms of human β-defensins in patients with ischemic stroke. Acta Neurol Scand 2012; 126:109-15. [PMID: 22050386 DOI: 10.1111/j.1600-0404.2011.01613.x] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Abstract
OBJECTIVES AND METHODS Genetic predisposition of the inflammatory host response may affect the development of stroke. On the basis of the theory of infectious burden and risk of stroke, we considered it of interest to investigate the relevance of the single-nucleotide polymorphisms (SNPs) in the DEFB1 gene and the copy number variant (CNV) of the DEFB4 genes in ischemic stroke. RESULTS There were no significant differences in the genotype frequencies of the three SNPs of the DEFB1 gene between the patients with stroke (n = 312) and the healthy blood donors (n = 221). However, a higher frequency of a lower (<4) copy number of the DEFB4 gene was observed in the patients with ischemic stroke as compared with the healthy controls (40% vs 24%, respectively). Additionally, low plasma concentrations of hBD-2 (187 ± 20 pg/ml) were characteristic of the patients with fewer than four copy numbers relative to those with more than four copy numbers (385 ± 35 pg/ml). CONCLUSIONS The low copy number of the DEFB4 gene, involving a weakened antimicrobial defense of the host, might be important in the pathogenesis of stroke.
Collapse
Affiliation(s)
- Z Tiszlavicz
- Department of Medical Microbiology and Immunobiology, University of Szeged, Szeged, Hungary
| | | | | | | | | | | | | |
Collapse
|
18
|
Haller J, Mátyás F, Soproni K, Varga B, Barsy B, Németh B, Mikics E, Freund TF, Hájos N. Correlated species differences in the effects of cannabinoid ligands on anxiety and on GABAergic and glutamatergic synaptic transmission. Eur J Neurosci 2007; 25:2445-56. [PMID: 17445240 PMCID: PMC1890583 DOI: 10.1111/j.1460-9568.2007.05476.x] [Citation(s) in RCA: 78] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/02/2023]
Abstract
Cannabinoid ligands show therapeutic potential in a variety of disorders including anxiety. However, the anxiety-related effects of cannabinoids remain controversial as agonists show opposite effects in mice and rats. Here we compared the effects of the cannabinoid agonist WIN-55,212 and the CB1 antagonist AM-251 in CD1 mice and Wistar rats. Special attention was paid to antagonist–agonist interactions, which had not yet been studied in rats. In mice, WIN-55,212 decreased whereas AM-251 increased anxiety. The antagonist abolished the effects of the agonist. In contrast, WIN-55,212 increased anxiety in rats. Surprisingly, the antagonist potentiated this effect. Cannabinoids affect both GABAergic and glutamatergic functions, which play opposite roles in anxiety. We hypothesized that discrepant findings resulted from species differences in the relative responsiveness of the two transmitter systems to cannabinoids. We investigated this hypothesis by studying the effects of WIN-55,212 on evoked hippocampal inhibitory and excitatory postsynaptic currents (IPSCs and EPSCs). IPSCs were one order of magnitude more sensitive to WIN-55,212 in mice than in rats. In mice, IPSCs were more sensitive than EPSCs to WIN-55,212. This is the first study showing that the relative cannabinoid sensitivity of GABA and glutamate neurotransmission is species-dependent. Based on behavioural and electrophysiological findings, we hypothesize that WIN-55,212 reduced anxiety in mice by affecting GABA neurotransmission whereas it increased anxiety in rats via glutamatergic mechanisms. In rats, AM-251 potentiated this anxiogenic effect by inhibiting the anxiolytic GABAergic mechanism. We suggest that the anxiety-related effects of cannabinoids depend on the relative cannabinoid responsiveness of GABAergic and glutamatergic neurotransmission.
Collapse
Affiliation(s)
- J Haller
- Institute of Experimental Medicine, Department of Behavioral Neurobiology, 1450 Budapest, PO Box 67, Hungary.
| | | | | | | | | | | | | | | | | |
Collapse
|
19
|
Németh B, Bencsik R, Opauszki A. Therapeutische Erfahrungen mit einem Blutextrakt bei Kornealäsionen. Klin Monbl Augenheilkd 1981. [DOI: 10.1055/s-2008-1057229] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
|
20
|
Németh B, Bencsik R, Opauszki A. [Experience with a blood extract in the treatment of corneal lesions (author's transl)]. Klin Monbl Augenheilkd 1981; 178:390-1. [PMID: 7253531] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/24/2023]
Abstract
The effect of Solcoseryl Eye Jelly (a protein-free extract from blood of young calves) was studied in 202 cases of corneal diseases of various etiology. It had an accelerating action on the reepithelization of the cornea after alkali burns, inflammations, injuries (foreign body and contact lenses and in keratoconjunctivitis sicca. The stability of the precorneal film was increased. The tendency toward symblepharon formation after alkali burns was considerably reduced.
Collapse
|
21
|
|
22
|
Antal M, Németh B. [Tubular structures in the endothelia of the retina and in retinoblastoma (author's transl)]. Klin Monbl Augenheilkd 1976; 169:496-9. [PMID: 994407] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
Abstract
Tubular inclusions in the capillary endothelium were observed in three retinoblastomas. The structure of these inclusions is the same as that observed in the capillary endothelium of the dog's retina.
Collapse
|
23
|
Németh B, Hudomel J, Farkas A. Effect of calcium bodesilate (doxium) on circulatory disorders of the retina with special emphasis on diabetic retinopathy. Ophthalmologica 1975; 170:434-45. [PMID: 1153166 DOI: 10.1159/000307250] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
Abstract
The authors examined the effect of calcium dobesilate (Doxium ¿) on 85 subjects with diabetic retinopathy, occlusion of the central vein of the retina and other retinopathies of vascular origin. Capillary resistance measured on the skin and conjunctiva showed, as compared with 100 healthy subjects, a significant decrease. The efficacy of long-term treatment with Doxium was highly significant in restoring CR to normal. Visual acuity improved in 45.8% of simple DR cases, and became stabilized in 27.5% of cases with malignant DR. Hyperpermeability of retinal vessels decreased in 60% of simple DR cases. It is pointed out that glaucoma did not develop in cases of venous occlusion and the diagnostic value of capillary resistance measurement in diabetes. As a highly effective vasoprotective drug, Doxium¿ is the treatment of choice in all retinopathies of vascular etiology.
Collapse
|
24
|
Abstract
In eyelid epitheloimata: basaliomata, spinaliomata and warts very numerous Langerhans granules were found in Langerhans cells
Collapse
|
25
|
Németh B, Antal M. [Mitochondrial crystals in a metastatic carcinoma of the choroid]. Klin Monbl Augenheilkd 1972; 161:411-6. [PMID: 4345881] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
|
26
|
Németh B, Kugler S. [Ophthalmo-filariasis]. Orv Hetil 1968; 109:195-7. [PMID: 5678047] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/16/2023]
|
27
|
Németh B, Pék L, Jasper A. [Data on the problem of the detection of otorhinolaryngeal foci from the viewpoint of ophthalmologic diseases]. Orv Hetil 1968; 109:69-72. [PMID: 5661485] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/16/2023]
|
28
|
Németh B. [A contribution to the curing of vascular hemianopsia]. Wien Med Wochenschr 1965; 115:1059-61. [PMID: 5871148] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/17/2023]
|
29
|
Németh B, Farkas E. [Clinical experiences in the use of Depersolon eye drops]. Orv Hetil 1965; 106:2037-9. [PMID: 5848895] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/17/2023]
|
30
|
|