Neuroglobin and cytoglobin as potential enzyme or substrate
2007 (English)In: Gene, ISSN 0378-1119, E-ISSN 1879-0038, Vol. 398, no 1-2, 103-113 p.Article in journal (Refereed) Published
The possible enzymatic activities of neuro- and cytoglobin as well as their potential function as substrates in enzymatic reactions were studied. Neuro- and cytoglobin are found to show no appreciable superoxide dismutase, catalase, and peroxidase activities. However, the internal disulfide bond (CD7-D5) of human neuroglobin can be reduced by thioredoxin reductase. Furthermore, our in vivo and in vitro studies show that Escherichia coli cells contain an enzymatic reducing system that keeps the heme iron atom of neuroglobin in the Fe2+ form in the presence of dioxygen despite the high autoxidation rate of the molecule. This reducing system needs a low-molecular-weight compound as co-factor. In vitro tests show that both NADH and NADPH can play this role. Furthermore, the reducing system is not specific for neuroglobin but allows the reduction of the ferric forms of other globins such as cytoglobin and myoglobin. A similar reducing system is present in eukaryotic tissue protein extracts.
Place, publisher, year, edition, pages
2007. Vol. 398, no 1-2, 103-113 p.
Research subject Medical Engineering for Healthcare
IdentifiersURN: urn:nbn:se:ltu:diva-9217DOI: 10.1016/j.gene.2007.02.038Local ID: 7c7b09c0-fd54-11db-b816-000ea68e967bOAI: oai:DiVA.org:ltu-9217DiVA: diva2:982155
Validerad; 2007; 20070508 (ramser)2016-09-292016-09-292016-10-19Bibliographically approved