Title
Cytochromes b561 : ascorbate-mediated trans-membrane electron transport Cytochromes b561 : ascorbate-mediated trans-membrane electron transport
Author
Faculty/Department
Faculty of Sciences. Biology
Publication type
article
Publication
Subject
Biology
Source (journal)
Antioxidants and redox signaling. - -
Volume/pages
19(2013) :9 , p. 1026-1035
ISSN
1523-0864
ISI
000323886400011
Carrier
E
Target language
English (eng)
Full text (Publishers DOI)
Affiliation
University of Antwerp
Abstract
Significance: Cytochromes b561 (CYB561s) constitute a family of trans-membrane (TM), di-heme proteins, occurring in a variety of organs and cell types, in plants and animals, and using ascorbate (ASC) as an electron donor. CYB561s function as monodehydroascorbate reductase, regenerating ASC, and as Fe3+-reductases, providing reduced iron for TM transport. A CYB561-core domain is also associated with dopamine β-monooxygenase redox domains (DOMON) in ubiquitous CYBDOM proteins. In plants, CYBDOMs form large protein families. Physiological functions supported by CYB561s and CYBDOMs include stress defense, cell wall modifications, iron metabolism, tumor suppression, and various neurological processes, including memory retention. CYB561s, therefore, significantly broaden our view on the physiological roles of ASC. Recent Advances: The ubiquitous nature of CYB561s is only recently being recognized. Significant advances have been made through the study of recombinant CYB561s, revealing structural and functional properties of a unique two-heme four-helix protein configuration. In addition, the DOMON domains of CYBDOMs are suggested to contain another heme b. Critical Issues: New CYB561 proteins are still being identified, and there is a need to provide an insight and overview on the various roles of these proteins and their structural properties. Future Directions: Mutant studies will reveal in greater detail the mechanisms by which CYB561s and CYBDOMs participate in cell metabolism in plants and animals. Moreover, the availability of efficient heterologous expression systems should allow protein crystallization, more detailed (atomic-level) structural information, and insights into the intra-molecular mechanism of electron transport.
Full text (open access)
https://repository.uantwerpen.be/docman/irua/14a943/9117c459.pdf
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