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Neurochem Res. 2007 Apr-May;32(4-5):871-91. Epub 2007 Mar 7. PubMed; doi 10.1007/s11064-006-9239-z

Enzyme-catalyzed side reactions with molecular oxygen may contribute to cell signaling and neurodegenerative diseases.

Bunik, V. I.; Schloss, J. V.; Pinto, J. T.; Gibson, G. E.; Cooper, A. J.

A link between neurodegeneration and well-characterized enzymatic and non-enzymatic reactions that produce reactive oxygen species (ROS) from O(2) is well established. Several enzymes that contain pyridoxal 5'-phosphate (PLP) or thiamine diphosphate (ThDP) catalyze side reactions (paracatalytic reactions) in the presence of ambient O(2). These side reactions produce oxidants such as hydrogen peroxide [H(2)O(2)] or extremely reactive peracids [RC(O)OOH]. We hypothesize that although these enzymes normally produce oxidants at low or undetectable levels, changes in substrate levels or disease-induced structural alterations may enhance interactions with O(2), thereby generating higher levels of reactive oxidants. These oxidants may damage the enzymes producing them, alter nearby macromolecules and/or destroy important metabolites/coenzymes. We propose that paracatalytic reactions with O(2) catalyzed by PLP-dependent decarboxylases and by ThDP-dependent enzymes within the alpha-keto acid dehydrogenase complexes may contribute to normal cellular signaling and to cellular damage in neurodegenerative diseases.



 


  Московский Государственный Университет имени М.В.Ломоносова



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