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• W4361303670 abstract "The arsenite oxidase (AioAB) from Pseudorhizobium banfieldiae sp. strain NT-26 catalyzes the oxidation of arsenite to arsenate and transfers electrons to its cognate electron acceptor cytochrome c552 (cytc552). This activity underpins the ability of this organism to respire using arsenite present in contaminated environments. The crystal structure of the AioAB/cytc552 electron transfer complex reveals two A2B2/(cytc552)2 assemblies per asymmetric unit. Three of the four cytc552 molecules in the asymmetric unit dock to AioAB in a cleft at the interface between the AioA and AioB subunits, with an edge-to-edge distance of 7.5 Å between the heme of cytc552 and the [2Fe-2S] Rieske cluster in the AioB subunit. The interface between the AioAB and cytc552 proteins features electrostatic and nonpolar interactions and is stabilized by two salt bridges. A modest number of hydrogen bonds, salt bridges and relatively small, buried surface areas between protein partners are typical features of transient electron transfer complexes. Interestingly, the fourth cytc552 molecule is positioned differently between two AioAB heterodimers, with distances between its heme and the AioAB redox active cofactors that are outside the acceptable range for fast electron transfer. This unique cytc552 molecule appears to be positioned to facilitate crystal packing rather than reflecting a functional complex." @default.
• W4361303670 created "2023-03-31" @default.
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• W4361303670 date "2023-03-30" @default.
• W4361303670 modified "2023-09-27" @default.
• W4361303670 title "The structure of the complex between the arsenite oxidase from <i>Pseudorhizobium banfieldiae</i> sp. strain NT-26 and its native electron acceptor cytochrome <i>c</i> ₅₅₂" @default.
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• W4361303670 doi "https://doi.org/10.1107/s2059798323002103" @default.
• W4361303670 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/36995233" @default.
• W4361303670 hasPublicationYear "2023" @default.
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