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Crystal Structures and Reaction Mechanism of 1-Cys Peroxiredoxin from Vibrio vulnificus

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dc.contributor.advisor하남출-
dc.contributor.author안진숙-
dc.date.accessioned2017-07-14T06:46:44Z-
dc.date.available2017-07-14T06:46:44Z-
dc.date.issued2016-08-
dc.identifier.other000000136038-
dc.identifier.urihttps://hdl.handle.net/10371/125952-
dc.description학위논문 (석사)-- 서울대학교 대학원 : 농생명공학부, 2016. 8. 하남출.-
dc.description.abstractVibrio vulnificus is capable of causing severe food-borne and often fatal wound infections. It causes two distinct disease syndromes, life-threatening septicemia and necrotizing wound infections. Under reactive oxygen species (ROS) and reactive nitrogen species (RNS) stress, pathogens have evolved elaborate strategies to survival against to host defense systems. Peroxiredoxins (Prxs) are the ubiquitous cysteine-based peroxidase enzymes. Recently, a new type of Prx, called VvPrx3, was identified in V. vulnificus as an essential gene for survival of the bacterium in a mouse model. It belongs to 1-Cys Prx family proteins that contain only one catalytic cysteine residue. Interestingly, VvPrx3 was induced by the transcriptional factor, IscR, different from other types of Prx in V. vulnificus. In this study, I determine the crystal structures of VvPrx3 from V. vulnificus both in the reduced and the oxidized forms at high resolutions. The crystal structure in the reduced form showed a typical dimeric interface, previously characterized as A-type interface. The oxidized structure revealed a novel oligomeric interface, which is mediated by a disulfide bond between the catalytic cysteine residues. Ensuing biochemical studies showed that this disulfide was induced by treatment of peroxides and NO. The oligomeric state of Prx3, which was shown in the crystal structure, was confirmed by analytic size exclusion chromatography. I also found that a reductase Grx3 can efficiently reduce the intermolecular disulfide of VvPrx3. Taken together, I propose a novel function of 1-Cys peroxiredoxin in direct scavenging of peroxides and NO stresses via a novel type of oligomerization, and these findings would help understand diverse functions of peroxiredoxins during pathogenic process at the molecular level. It may further contribute to development of drugs or food sanitizers to cope with the food-borne diseases caused by Vibrio vulnificus by controlling the Prx3 functions based on the structure of Prx3.-
dc.description.tableofcontentsI. INTRODUCTION 1

II. MATERIALS AND METHODS 5
2.1. Plasmid construction 5
2.2. Site direct mutagenesis 5
2.3. Purification of Prx3 (C48D/C73S) and Prx3 (C73S) 6
2.3.1. Overexpression 6
2.3.2. Affinity chromatography 6
2.3.3. Anion-exchange chromatography 7
2.3.4. Size exclusion chromatography 7
2.4. Crystallization 8
2.5. Structure determination and refinement 8
2.6. Oxidation of VvPrx3 by H2O2 or NO 9
2.7. Analytic size exclusion chromatography 10
2.8. Reductase activity of Grx3 on the disulfided VvPrx3 protein 10

III. RESULTS 13
3.1. Overexpression and purification of Prx3 (C48D/C73S) and Prx3 (C73S) proteins 13
3.2. Crystals of VvPrx3 (C48D/C73S) and Prx3 (C73S) 15
3.3. Structural determination of VvPrx3 16
3.4. Structural comparison between the reduced and disulfide state of VvPrx3 22
3.5. Intermolecular disulfide formation of VvPrx3 26
3.6. The unique redox-dependent oligomerization of VvPrx3 30
3.7. H2O2 binding site 34
3.8. NO induces the intermolecular disulfide 36
3.9. Disulfide state of VvPrx3 are reduced dependent on Grx3 and GSH 39

IV. DISCUSSION 41

V. REFERENCES 45

VI. 국문 초록 53
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dc.formatapplication/pdf-
dc.format.extent1874937 bytes-
dc.format.mediumapplication/pdf-
dc.language.isoen-
dc.publisher서울대학교 대학원-
dc.subjectVibrio vulnificus-
dc.subject1-Cys Prx-
dc.subjecthydrogen peroxide-
dc.subjectnitric oxide-
dc.subject.ddc630-
dc.titleCrystal Structures and Reaction Mechanism of 1-Cys Peroxiredoxin from Vibrio vulnificus-
dc.typeThesis-
dc.contributor.AlternativeAuthorJinsook Ahn-
dc.description.degreeMaster-
dc.citation.pagesVI, 54-
dc.contributor.affiliation농업생명과학대학 농생명공학부-
dc.date.awarded2016-08-
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