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Humboldt-Universitaet zu Berlin - Structural Biology / Biochemistry

Humboldt-Universitaet zu Berlin | Department of Biology | Structural Biology / Biochemistry | A novel [Fe8S9] double-cubane cluster for ATP-dependent substrate reduction

A novel [Fe8S9] double-cubane cluster for ATP-dependent substrate reduction

 

 

 

 

 

 

 

 

 

 

In their paper published in PNASJae-Hun Jeoung and Holger Dobbek used bioinformatic tools, kinetics and x-ray crystallography to describe a novel two-component enzyme catalyzing the chemically demanding reduction of small molecules (acetylene, azide, hydrazine), reactions so far known to be the hallmark of nitrogenases.

The two components are the DCCP (double-cubane cluster protein) and its reductase, DCCP-R (R for Reductase). DCCP-R energizes electrons at the expense of ATP hydrolysis and these electrons are then used by the DCCP to reduce small molecule substrates at the active site [Fe8S9] double-cubane cluster. Although known from synthetic inorganic chemistry, this double-cubane cluster is unprecedented in biology. Comparison with members of the same ATP-dependent energizing electron systems, suggest it to be the first member of a novel enzyme family.

Citation:

Jae-Hun Jeoung and Holger Dobbek (2018): “ATP-dependent substrate reduction at an [Fe8S9] double-cubane cluster.“

PNAS doi: 10.1073/pnas.1720489115

Link: https://www.ncbi.nlm.nih.gov/pubmed/29507223