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Stewart Z, Garcin E, Nazac A, Mezan de Malartic C, Georges C, Cimmino A. Organization and first results of cervical cancer screening program in Mayotte, from 2010 to 2014. J Gynecol Obstet Hum Reprod 2017; 46:125-130. [PMID: 28403967 DOI: 10.1016/j.jogoh.2016.11.001] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [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: 01/03/2016] [Revised: 11/20/2016] [Accepted: 11/25/2016] [Indexed: 10/20/2022]
Abstract
OBJECTIVES Our main goal was to report the organization of individual screening for uterus cancer in Mayotte, the last French department since 2011, and its first results. MATERIAL AND METHODS Epidemiological and observational study describing the prior situation, the beginning of the screening with pap smears in 2010, the colposcopy consultations and the treatment of the patients by the Mayotte network for screening of cancers since 2010. RESULTS The screening allowed an improvement of the global cover rate from 5% to 24% in 5 years. The best results concern the woman from 25 to 39 years old, with a rate that rose from 14 to 46%. CONCLUSION This study confirms the possibility and the efficiency of a screening program on this island, which is French by law, by much closer to developing countries on many other sides.
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Affiliation(s)
- Z Stewart
- Service de gynécologie, d'obstétrique et de médecine de la reproduction, CHU de Caen, avenue de la Côte de Nacre, 14033 Caen cedex 9, France; Centre hospitalier de Mayotte, BP 04, 97600 Mamoudzou, Mayotte, France.
| | - E Garcin
- Maternité régionale universitaire de Nancy, 10, rue du Docteur-Heydenreich, CS 74213, 54042 Nancy cedex, France; Centre hospitalier de Mayotte, BP 04, 97600 Mamoudzou, Mayotte, France.
| | - A Nazac
- Service de gynécologie-obstétrique, CHU Brugmann, Bruxelles, Belgium; LPICM, CNRS, école polytechnique, université Paris Saclay, 91128 Palaiseau, France.
| | - C Mezan de Malartic
- Maternité régionale universitaire de Nancy, 10, rue du Docteur-Heydenreich, CS 74213, 54042 Nancy cedex, France.
| | - C Georges
- Réseau de dépistage du cancer (REDECA), 4, rue Mariazé, 97600 Mamoudzou, France.
| | - A Cimmino
- Réseau de dépistage du cancer (REDECA), 4, rue Mariazé, 97600 Mamoudzou, France.
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Pieulle L, Stocker P, Vinay M, Nouailler M, Vita N, Brasseur G, Garcin E, Sebban-Kreuzer C, Dolla A. Study of the thiol/disulfide redox systems of the anaerobe Desulfovibrio vulgaris points out pyruvate:ferredoxin oxidoreductase as a new target for thioredoxin 1. J Biol Chem 2011; 286:7812-7821. [PMID: 21199874 DOI: 10.1074/jbc.m110.197988] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023] Open
Abstract
Sulfate reducers have developed a multifaceted adaptative strategy to survive against oxidative stresses. Along with this oxidative stress response, we recently characterized an elegant reversible disulfide bond-dependent protective mechanism in the pyruvate:ferredoxin oxidoreductase (PFOR) of various Desulfovibrio species. Here, we searched for thiol redox systems involved in this mechanism. Using thiol fluorescent labeling, we show that glutathione is not the major thiol/disulfide balance-controlling compound in four different Desulfovibrio species and that no other plentiful low molecular weight thiol can be detected. Enzymatic analyses of two thioredoxins (Trxs) and three thioredoxin reductases allow us to propose the existence of two independent Trx systems in Desulfovibrio vulgaris Hildenborough (DvH). The TR1/Trx1 system corresponds to the typical bacterial Trx system. We measured a TR1 apparent K(m) value for Trx1 of 8.9 μM. Moreover, our results showed that activity of TR1 was NADPH-dependent. The second system named TR3/Trx3 corresponds to an unconventional Trx system as TR3 used preferentially NADH (K(m) for NADPH, 743 μM; K(m) for NADH, 5.6 μM), and Trx3 was unable to reduce insulin. The K(m) value of TR3 for Trx3 was 1.12 μM. In vitro experiments demonstrated that the TR1/Trx1 system was the only one able to reactivate the oxygen-protected form of Desulfovibrio africanus PFOR. Moreover, ex vivo pulldown assays using the mutant Trx1(C33S) as bait allowed us to capture PFOR from the DvH extract. Altogether, these data demonstrate that PFOR is a new target for Trx1, which is probably involved in the protective switch mechanism of the enzyme.
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Affiliation(s)
- Laetitia Pieulle
- From the Laboratoire Interactions et Modulateurs de Réponses, CNRS-UPR3243-IFR88, 31 Chemin Joseph Aiguier, 13402 Marseille Cedex 20 and.
| | - Pierre Stocker
- the Equipe Biosciences iSm2, UMR6263, Case 342, FST Université Paul Cézanne, St. Jérome, 13397 Marseille Cedex 20, France
| | - Manon Vinay
- From the Laboratoire Interactions et Modulateurs de Réponses, CNRS-UPR3243-IFR88, 31 Chemin Joseph Aiguier, 13402 Marseille Cedex 20 and
| | - Matthieu Nouailler
- From the Laboratoire Interactions et Modulateurs de Réponses, CNRS-UPR3243-IFR88, 31 Chemin Joseph Aiguier, 13402 Marseille Cedex 20 and
| | - Nicolas Vita
- From the Laboratoire Interactions et Modulateurs de Réponses, CNRS-UPR3243-IFR88, 31 Chemin Joseph Aiguier, 13402 Marseille Cedex 20 and
| | - Gaël Brasseur
- From the Laboratoire Interactions et Modulateurs de Réponses, CNRS-UPR3243-IFR88, 31 Chemin Joseph Aiguier, 13402 Marseille Cedex 20 and
| | - Edwige Garcin
- From the Laboratoire Interactions et Modulateurs de Réponses, CNRS-UPR3243-IFR88, 31 Chemin Joseph Aiguier, 13402 Marseille Cedex 20 and
| | - Corinne Sebban-Kreuzer
- From the Laboratoire Interactions et Modulateurs de Réponses, CNRS-UPR3243-IFR88, 31 Chemin Joseph Aiguier, 13402 Marseille Cedex 20 and
| | - Alain Dolla
- From the Laboratoire Interactions et Modulateurs de Réponses, CNRS-UPR3243-IFR88, 31 Chemin Joseph Aiguier, 13402 Marseille Cedex 20 and
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Richard SB, Madern D, Garcin E, Zaccai G. Halophilic adaptation: novel solvent protein interactions observed in the 2.9 and 2.6 A resolution structures of the wild type and a mutant of malate dehydrogenase from Haloarcula marismortui. Biochemistry 2000; 39:992-1000. [PMID: 10653643 DOI: 10.1021/bi991001a] [Citation(s) in RCA: 83] [Impact Index Per Article: 3.5] [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: 11/28/2022]
Abstract
Previous biophysical studies of tetrameric malate dehydrogenase from the halophilic archaeon Haloarcula marismortui (Hm MalDH) have revealed the importance of protein-solvent interactions for its adaptation to molar salt conditions that strongly affect protein solubility, stability, and activity, in general. The structures of the E267R stability mutant of apo (-NADH) Hm MalDH determined to 2.6 A resolution and of apo (-NADH) wild type Hm MalDH determined to 2.9 A resolution, presented here, highlight a variety of novel protein-solvent features involved in halophilic adaptation. The tetramer appears to be stabilized by ordered water molecule networks and intersubunit complex salt bridges "locked" in by bound solvent chloride and sodium ions. The E267R mutation points into a central ordered water cavity, disrupting protein-solvent interactions. The analysis of the crystal structures showed that halophilic adaptation is not aimed uniquely at "protecting" the enzyme from the extreme salt conditions, as may have been expected, but, on the contrary, consists of mechanisms that harness the high ionic concentration in the environment.
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Affiliation(s)
- S B Richard
- Institut de Biologie Structurale, CEA-CNRS, 41 Avenue des Martyrs, F-38027 Grenoble Cedex 1, France
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Garcin E, Vernede X, Hatchikian EC, Volbeda A, Frey M, Fontecilla-Camps JC. The crystal structure of a reduced [NiFeSe] hydrogenase provides an image of the activated catalytic center. Structure 1999; 7:557-66. [PMID: 10378275 DOI: 10.1016/s0969-2126(99)80072-0] [Citation(s) in RCA: 381] [Impact Index Per Article: 15.2] [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: 10/16/2022]
Abstract
BACKGROUND [NiFeSe] hydrogenases are metalloenzymes that catalyze the reaction H2<-->2H+ + 2e-. They are generally heterodimeric, contain three iron-sulfur clusters in their small subunit and a nickel-iron-containing active site in their large subunit that includes a selenocysteine (SeCys) ligand. RESULTS We report here the X-ray structure at 2.15 A resolution of the periplasmic [NiFeSe] hydrogenase from Desulfomicrobium baculatum in its reduced, active form. A comparison of active sites of the oxidized, as-prepared, Desulfovibrio gigas and the reduced D. baculatum hydrogenases shows that in the reduced enzyme the nickel-iron distance is 0.4 A shorter than in the oxidized enzyme. In addition, the putative oxo ligand, detected in the as-prepared D. gigas enzyme, is absent from the D. baculatum hydrogenase. We also observe higher-than-average temperature factors for both the active site nickel-selenocysteine ligand and the neighboring Glu18 residue, suggesting that both these moieties are involved in proton transfer between the active site and the molecular surface. Other differences between [NiFeSe] and [NiFe] hydrogenases are the presence of a third [4Fe4S] cluster replacing the [3Fe4S] cluster found in the D. gigas enzyme, and a putative iron center that substitutes the magnesium ion that has already been described at the C terminus of the large subunit of two [NiFe] hydrogenases. CONCLUSIONS The heterolytic cleavage of molecular hydrogen seems to be mediated by the nickel center and the selenocysteine residue. Beside modifying the catalytic properties of the enzyme, the selenium ligand might protect the nickel atom from oxidation. We conclude that the putative oxo ligand is a signature of inactive 'unready' [NiFe] hydrogenases.
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Affiliation(s)
- E Garcin
- Institut de Biologie Structurale JP Ebel, Laboratoire de Cristallographie et Cristallogénèse des Protéines, CEA-CNRS, Grenoble, France
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Garcin E, Montet Y, Volbeda A, Hatchikian C, Frey M, Fontecilla-Camps JC. Structural bases for the catalytic mechanism of [NiFe] hydrogenases. Biochem Soc Trans 1998; 26:396-401. [PMID: 9765886 DOI: 10.1042/bst0260396] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Affiliation(s)
- E Garcin
- Laboratoire de Cristallographie et de Cristallogenèse des Protéines, Institut de Biologie Structurale-Jean-Pierre-Ebel CEA-CNRS, Grenoble, France
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Fontecilla-Camps JC, Frey M, Garcin E, Hatchikian C, Montet Y, Piras C, Vernède X, Volbeda A. Hydrogenase: a hydrogen-metabolizing enzyme. What do the crystal structures tell us about its mode of action? Biochimie 1997; 79:661-6. [PMID: 9479448 DOI: 10.1016/s0300-9084(97)83499-2] [Citation(s) in RCA: 46] [Impact Index Per Article: 1.7] [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: 02/06/2023]
Abstract
Hydrogenases are proteins which metabolize the most simple of chemical compounds, molecular hydrogen, according to the reaction H2<-->2H+ + 2e-. These enzymes are found in many microorganisms of great biotechnological interest such as methanogenic, acetogenic, nitrogen fixing, photosynthetic or sulfate-reducing bacteria. The X-ray structure of a dimeric [NiFe] hydrogenase together with a wealth of biophysical, biochemical and genetic studies have revealed that the large subunit contains the bimetallic [Ni-Fe] active site, with biologically uncommon CO and CN ligands to the iron, whereas the small subunit contains three iron-sulfur cluster. During catalysis, the nickel atom is most likely responsible for a base-assisted heterolytic cleavage of the hydrogen molecule whereas the iron atom could be redox active. Specific channels are probably required for the transfer of the chemical reaction partners (H2, H+ and e-) between the active site, deeply buried inside the protein, and the molecular surface. The generation of a functional enzyme, including the assembly of the complex catalytic center, requires maturation and involves a large number of auxiliary proteins which have been partly characterized by molecular biology.
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Affiliation(s)
- J C Fontecilla-Camps
- Laboratoire de Cristallographie et de Cristallogenèse des Protéines, Institut de Biologie Structurale Jean-Pierre-Ebel CEA-CNRS, Grenoble, France
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