Crystal structure of the 100 kDa arsenite oxidase from Alcaligenes faecalis in two crystal forms at 1.64 A and 2.03 A
Ellis, PJ; Conrads, T; Hille, R; Kuhn, P
HERO ID
1019009
Reference Type
Journal Article
Year
2001
Language
English
PMID
| HERO ID | 1019009 |
|---|---|
| In Press | No |
| Year | 2001 |
| Title | Crystal structure of the 100 kDa arsenite oxidase from Alcaligenes faecalis in two crystal forms at 1.64 A and 2.03 A |
| Authors | Ellis, PJ; Conrads, T; Hille, R; Kuhn, P |
| Journal | Structure |
| Volume | 9 |
| Issue | 2 |
| Page Numbers | 125-132 |
| Abstract | <strong>BACKGROUND: </strong>Arsenite oxidase from Alcaligenes faecalis NCIB 8687 is a molybdenum/iron protein involved in the detoxification of arsenic. It is induced by the presence of AsO(2-) (arsenite) and functions to oxidize As(III)O(2-), which binds to essential sulfhydryl groups of proteins and dithiols, to the relatively less toxic As(V)O(4)(3-) (arsenate) prior to methylation.<br /><br /><strong>RESULTS: </strong>Using a combination of multiple isomorphous replacement with anomalous scattering (MIRAS) and multiple-wavelength anomalous dispersion (MAD) methods, the crystal structure of arsenite oxidase was determined to 2.03 A in a P2(1) crystal form with two molecules in the asymmetric unit and to 1.64 A in a P1 crystal form with four molecules in the asymmetric unit. Arsenite oxidase consists of a large subunit of 825 residues and a small subunit of approximately 134 residues. The large subunit contains a Mo site, consisting of a Mo atom bound to two pterin cofactors, and a [3Fe-4S] cluster. The small subunit contains a Rieske-type [2Fe-2S] site.<br /><br /><strong>CONCLUSIONS: </strong>The large subunit of arsenite oxidase is similar to other members of the dimethylsulfoxide (DMSO) reductase family of molybdenum enzymes, particularly the dissimilatory periplasmic nitrate reductase from Desulfovibrio desulfuricans, but is unique in having no covalent bond between the polypeptide and the Mo atom. The small subunit has no counterpart among known Mo protein structures but is homologous to the Rieske [2Fe-2S] protein domain of the cytochrome bc(1) and cytochrome b(6)f complexes and to the Rieske domain of naphthalene 1,2-dioxygenase. |
| Doi | 10.1016/S0969-2126(01)00566-4 |
| Pmid | 11250197 |
| Wosid | WOS:000168050500006 |
| Url | https://www.proquest.com/scholarly-journals/crystal-structure-100-kda-arsenite-oxidase/docview/71003730/se-2 |
| Is Certified Translation | No |
| Dupe Override | No |
| Comments | Source: Web of Science WOS:000168050500006 |
| Is Public | Yes |
| Language Text | English |
| Keyword | Molybdenum; 81AH48963U; Oxidoreductases; arsenite oxidase; EC 1.16.-; Index Medicus; Electron Transport; Molecular Weight; Hydrogen Bonding; Crystallography, X-Ray; Molybdenum -- chemistry; Protein Conformation; Molecular Structure; Binding Sites; Oxidoreductases -- chemistry; Alcaligenes -- chemistry |
| Relationship(s) |
|