{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2025,11,12]],"date-time":"2025-11-12T03:08:34Z","timestamp":1762916914973},"reference-count":51,"publisher":"Portland Press Ltd.","issue":"1","content-domain":{"domain":["portlandpress.com"],"crossmark-restriction":true},"short-container-title":[],"published-print":{"date-parts":[[2004,7,1]]},"abstract":"<jats:p>The SOR (sulphur oxygenase reductase) is the initial enzyme in the sulphur-oxidation pathway of Acidianus ambivalens. Expression of the sor gene in Escherichia coli resulted in active, soluble SOR and in inclusion bodies from which active SOR could be refolded as long as ferric ions were present in the refolding solution. Wild-type, recombinant and refolded SOR possessed indistinguishable properties. Conformational stability studies showed that the apparent unfolding free energy in water is approx.\u00a05\u00a0kcal\u00b7mol\u22121 (1\u00a0kcal=4.184\u00a0kJ), at pH\u00a07. The analysis of the quaternary structures showed a ball-shaped assembly with a central hollow core probably consisting of 24 subunits in a 432 symmetry. The subunits form homodimers as the building blocks of the holoenzyme. Iron was found in the wild-type enzyme at a stoichiometry of one iron atom\/subunit. EPR spectroscopy of the colourless SOR resulted in a single isotropic signal at g=4.3, characteristic of high-spin ferric iron. The signal disappeared upon reduction with dithionite or incubation with sulphur at elevated temperature. Thus both EPR and chemical analysis indicate the presence of a mononuclear iron centre, which has a reduction potential of \u2212268\u00a0mV at pH\u00a06.5. Protein database inspection identified four SOR protein homologues, but no other significant similarities. The spectroscopic data and the sequence comparison led to the proposal that the Acidianus ambivalens SOR typifies a new type of non-haem iron enzyme containing a mononuclear iron centre co-ordinated by carboxylate and\/or histidine ligands.<\/jats:p>","DOI":"10.1042\/bj20040003","type":"journal-article","created":{"date-parts":[[2004,6,22]],"date-time":"2004-06-22T13:45:11Z","timestamp":1087911911000},"page":"137-146","update-policy":"http:\/\/dx.doi.org\/10.1042\/crossmark_policy","source":"Crossref","is-referenced-by-count":51,"title":["The sulphur oxygenase reductase from <i>Acidianus ambivalens<\/i> is a multimeric protein containing a low-potential mononuclear non-haem iron centre"],"prefix":"10.1042","volume":"381","author":[{"given":"Tim","family":"URICH","sequence":"first","affiliation":[{"name":"Institute of Microbiology and Genetics, Darmstadt University of Technology, Schnittspahnstrasse 10, 64287 Darmstadt, Germany"}]},{"given":"Tiago\u00a0M.","family":"BANDEIRAS","sequence":"additional","affiliation":[{"name":"Instituto de Tecnologia Qu\u00edmica e Biol\u00f3gica, Universidade Nova de Lisboa, Rua da Quinta Grande 6, Apt 127, 2780-156, Oeiras, Portugal"}]},{"given":"S\u00f3nia\u00a0S.","family":"LEAL","sequence":"additional","affiliation":[{"name":"Instituto de Tecnologia Qu\u00edmica e Biol\u00f3gica, Universidade Nova de Lisboa, Rua da Quinta Grande 6, Apt 127, 2780-156, Oeiras, Portugal"}]},{"given":"Reinhard","family":"RACHEL","sequence":"additional","affiliation":[{"name":"Department of Microbiology and Archaeenzentrum, Universit\u00e4tsstrasse 31, 93053 Regensburg, Germany"}]},{"given":"Till","family":"ALBRECHT","sequence":"additional","affiliation":[{"name":"Institute of Microbiology and Genetics, Darmstadt University of Technology, Schnittspahnstrasse 10, 64287 Darmstadt, Germany"}]},{"given":"Peter","family":"ZIMMERMANN","sequence":"additional","affiliation":[{"name":"Institute of Microbiology and Genetics, Darmstadt University of Technology, Schnittspahnstrasse 10, 64287 Darmstadt, Germany"}]},{"given":"Corinna","family":"SCHOLZ","sequence":"additional","affiliation":[{"name":"Institute of Microbiology and Genetics, Darmstadt University of Technology, Schnittspahnstrasse 10, 64287 Darmstadt, Germany"}]},{"given":"Miguel","family":"TEIXEIRA","sequence":"additional","affiliation":[{"name":"Instituto de Tecnologia Qu\u00edmica e Biol\u00f3gica, Universidade Nova de Lisboa, Rua da Quinta Grande 6, Apt 127, 2780-156, Oeiras, Portugal"}]},{"given":"Cl\u00e1udio\u00a0M.","family":"GOMES","sequence":"additional","affiliation":[{"name":"Instituto de Tecnologia Qu\u00edmica e Biol\u00f3gica, Universidade Nova de Lisboa, Rua da Quinta Grande 6, Apt 127, 2780-156, Oeiras, Portugal"},{"name":"Departamento de Qu\u00edmica, Faculdade de Ci\u00eancias e Tecnologia, Universidade Nova de Lisboa, 2825-114 Caparica, Portugal"}]},{"given":"Arnulf","family":"KLETZIN","sequence":"additional","affiliation":[{"name":"Institute of Microbiology and Genetics, Darmstadt University of Technology, Schnittspahnstrasse 10, 64287 Darmstadt, Germany"}]}],"member":"288","published-online":{"date-parts":[[2004,6,22]]},"reference":[{"key":"2021112213013988700_B1","doi-asserted-by":"crossref","first-page":"95","DOI":"10.1023\/A:1000135707181","article-title":"Oxidative metabolism of inorganic sulfur compounds by bacteria","volume":"71","author":"Kelly","year":"1997","journal-title":"Antonie van Leeuwenhoek"},{"key":"2021112213013988700_B2","doi-asserted-by":"crossref","first-page":"235","DOI":"10.1016\/S0065-2911(08)60018-1","article-title":"Physiology and genetics of sulfur-oxidizing bacteria","volume":"39","author":"Friedrich","year":"1998","journal-title":"Adv. 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