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TitleA 192-heme electron transfer network in the hydrazine dehydrogenase complex.
Journal, issue, pagesSci Adv, Vol. 5, Issue 4, Page eaav4310, Year 2019
Publish dateApr 17, 2019
AuthorsM Akram / A Dietl / U Mersdorf / S Prinz / W Maalcke / J Keltjens / C Ferousi / N M de Almeida / J Reimann / B Kartal / M S M Jetten / K Parey / T R M Barends /
PubMed AbstractAnaerobic ammonium oxidation (anammox) is a major process in the biogeochemical nitrogen cycle in which nitrite and ammonium are converted to dinitrogen gas and water through the highly reactive ...Anaerobic ammonium oxidation (anammox) is a major process in the biogeochemical nitrogen cycle in which nitrite and ammonium are converted to dinitrogen gas and water through the highly reactive intermediate hydrazine. So far, it is unknown how anammox organisms convert the toxic hydrazine into nitrogen and harvest the extremely low potential electrons (-750 mV) released in this process. We report the crystal structure and cryo electron microscopy structures of the responsible enzyme, hydrazine dehydrogenase, which is a 1.7 MDa multiprotein complex containing an extended electron transfer network of 192 heme groups spanning the entire complex. This unique molecular arrangement suggests a way in which the protein stores and releases the electrons obtained from hydrazine conversion, the final step in the globally important anammox process.
External linksSci Adv / PubMed:31001586 / PubMed Central
MethodsEM (single particle) / X-ray diffraction
Resolution2.8 - 6.2 Å
Structure data

EMDB-0205:
Cryo-EM structure of the hydrazine dehydrogenase from Kuenia stuttgartiensis in the octameric state
Method: EM (single particle) / Resolution: 5.2 Å

EMDB-0206:
Cryo-EM structure of the hydrazine dehydrogenase from Kuenia stuttgartiensis in the octameric state at high salt condition
Method: EM (single particle) / Resolution: 5.5 Å

EMDB-0207:
Cryo-EM structure of the hydrazine dehydrogenase from Kuenia stuttgartiensis in the decameric state
Method: EM (single particle) / Resolution: 6.2 Å

PDB-6hif:
Kuenenia stuttgartiensis hydrazine dehydrogenase complex
Method: X-RAY DIFFRACTION / Resolution: 2.8 Å

Chemicals

ChemComp-HEC:
HEME C / Heme C

ChemComp-SO4:
SULFATE ION / Sulfate

ChemComp-GOL:
GLYCEROL / Glycerol

ChemComp-K:
Unknown entry

ChemComp-HOH:
WATER / Water

Source
  • Candidatus Kuenenia stuttgartiensis (bacteria)
  • kuenenia stuttgartiensis (bacteria)
KeywordsOXIDOREDUCTASE / anammox / hydrazine / dehydrogenase / P460 / redox

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