9rk3

Soluble domain of kustd1480, a Rieske iron-sulfur cluster protein from Kuenenia stuttgartiensis

spinqualitylabelsall models 9rk3, resolution 2.50Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 9rk3 is a 2 chain structure with sequence from Candidatus Kuenenia sp.. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Method: X-ray diffraction, Resolution 2.5Å, 8 models Ligands: FES Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Function Q1PYR8_KUEST Publication Abstract from PubMed Anaerobic ammonium-oxidizing (anammox) bacteria employ a unique, hydrazine-based pathway to obtain energy from nitrite and ammonium. These organisms possess distinct Rieske/cytochrome b complexes whose precise role in anammox metabolism remains unclear, but which have been proposed to include the generation of NAD(P)H. This would require energetics and structural features unusual for such complexes. Here we present crystal structures and electrochemical investigations of the Rieske subunits of two of these complexes from the anammox organism Kuenenia stuttgartiensis, Kuste4569 and Kustd1480. Both proteins display high redox potentials (> + 300 mV), which can be in part explained by their crystal structures and which fit perfectly into the energetic scheme of the proposed NAD(P)H generation mechanism. Moreover, AlphaFold3 models of the parent complexes trace out a path for the electrons required for NAD(P)H production, which includes a proposed, novel b-type heme in the membrane-bound part of the complex. Rieske Iron-Sulfur Cluster Proteins From an Anaerobic Ammonium Oxidizer Suggest Unusual Energetics in Their Parent Rieske/Cytochrome b Complexes.,Hauser D, Sode M, Andreeva EA, Parey K, Barends TRM Proteins. 2025 Nov 12. doi: 10.1002/prot.70084. PMID:41222066 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

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