Periplasmic superoxide dismutases in Aquaspirillum magnetotacticum
نویسندگان
چکیده
منابع مشابه
Freeze-Thawing of Aquaspirillum magnetotacticum Cells Selectively Releases Periplasmic Proteins.
Cells of the gram-negative bacterium Aquaspirillum magnetotacticum, when suspended in buffer and freeze-thawed, produced pinkish orange supernatant fluid. The fluid contained </=2.0% of total extractable outer membrane component 2-keto-3-deoxyoctonate or of the cytoplasmic membrane marker succinic dehydrogenase. Electrophoretic banding patterns and difference spectra of proteins and hemoprotein...
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Periplasmic Cu, Zn-cofactored superoxide dismutase (SodC) protects Gram-negative bacteria from exogenous oxidative damage. The virulent Salmonella typhimurium strain ATCC 14028s has been found to contain two discrete periplasmic Cu, Zn-SOD enzymes that are only 57% identical at the amino acid level. SodCI is carried by a cryptic bacteriophage, and SodCII is closely related to the Cu, Zn-superox...
متن کاملMicroaerobic Conditions Are Required for Magnetite Formation Within Aquaspirillum magnetotacticum
The amount of magnetite (Fe304) within mag netosomes of the microaerophilic bacterium AquQspirillum magnetotacticum varies with oxygen and nitrogen supply. The development of optical methods for directly measuring cell magnetism in culture samples has enabled us to quantitate bacterial Fe304 yields. We measured final cell yields. average cell magnetic moments, and magnetosome Yields of growing...
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Yuewei Sheng,† Isabel A. Abreu,*,‡,§ Diane E. Cabelli,* Michael J. Maroney,* Anne-Frances Miller,* Miguel Teixeira,*,‡ and Joan Selverstone Valentine*,†,∇ †Department of Chemistry and Biochemistry, University of California Los Angeles, Los Angeles, California 90095, United States ‡Instituto de Tecnologia Química e Bioloǵica Antońio Xavier, Universidade Nova de Lisboa, Av. da Repub́lica, 2780-157...
متن کاملSuperoxide radical and superoxide dismutases.
O2- oxidizes the [4Fe-4S] clusters of dehydratases, such as aconitase, causing-inactivation and release of Fe(II), which may then reduce H2O2 to OH- +OH.. SODs inhibit such HO. production by scavengingO2-, but Cu, ZnSODs, by virtue of a nonspecific peroxidase activity, may peroxidize spin trapping agents and thus give the appearance of catalyzing OH. production from H2O2. There is a glycosylate...
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ژورنال
عنوان ژورنال: Archives of Microbiology
سال: 1989
ISSN: 0302-8933,1432-072X
DOI: 10.1007/bf00425171