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How to protect biocatalysts from oxygen
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How to protect biocatalysts from oxygen
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An international research team from the Photobiotechnology Research Group at Ruhr-Universität Bochum (RUB) led by Professor Thomas Happe and the Laboratoire de Bioénergétique et Ingénierie des Protéines (CNRS) in Marseille has been able to get to the bottom of this unique feature. They describe the molecular mechanism in
Nature Communications on 2 February 2021.
Enzyme repeatedly survives the attack unharmed
Representatives of the [FeFe]-hydrogenase enzyme group combine protons and electrons to form molecular hydrogen at particularly high turnover rates. Some of them even use sunlight as a primary energy source for this. However, even low oxygen concentrations quickly lead to the irreversible breakdown of the catalytic cofactor, called the H-cluster. This has so far been observed in all representatives of this enzyme group - except for CbA5H. This enzyme has a molecular mechanism that allows it to repeatedly survive the oxygen attack unharmed, says Thomas Happe.
(Ruhr University Bochum) Green algae have two almost identical hydrogen-producing enzymes. One has been researched for decades, the other received little attention – until recently.
Hydrogen-producing enzymes, so-called hydrogenases, could be a source of regenerative energy. The RUB photobiotechnology working group has now characterized a hydrogenase from the green alga
Chlamydomonas reinhardtii that has so far hardly been researched . Green algae have two almost identical hydrogenases. Although they differ in only one single amino acid, they have different properties, the Bochum team found. The researchers headed by Dr. Vera Engelbrecht and Prof. Dr. Thomas Happe in the “International Journal of Hydrogen Energy” on December 16, 2020.
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