Structure and function of the hybrid cluster protein

Research output: Contribution to journalReview articleScientificpeer-review

2 Citations (Scopus)
11 Downloads (Pure)


A hybrid cluster (HC) is a 4Fe cluster with both sulfur and oxygen bridges. Hybrid cluster proteins (Hcps) contain two 4Fe clusters, a one electron transferring iron-sulfur cluster and a hybrid cluster. The structural gene, hcp, is diffusely found in bacteria, archaea, and monocellular eukarya, and the HC binding motif involving amino acids H, E, C, C, C, C, E, (K) appears to be fully conserved. HC is the active site of the enzyme Hcp. Of several reported Hcp enzymatic activities the conversion of nitric oxide into nitrous oxide, NO reductase, has been established as physiologically relevant. Other activities, notably signal transduction by NO transfer to other proteins, are controversial. The HC undergoes a complex structural change associated with single-electron iron based redox chemistry as well as electron-pair redox chemistry of a persulfidocysteine sulfur atom. A mechanistic scheme is proposed for the HC encompassing its structural, magnetic, and enzymatic properties.

Original languageEnglish
Article number214405
Number of pages16
JournalCoordination Chemistry Reviews
Publication statusPublished - 2022


  • CO dehydrogenase
  • Hybrid cluster protein
  • NO reductase
  • Persulfide
  • Prismane protein
  • S-nitrosylase


Dive into the research topics of 'Structure and function of the hybrid cluster protein'. Together they form a unique fingerprint.

Cite this