Dcytb (duodenal cytochrome b) is an iron-regulated ferric reductase highly expressed in duodenal enterocytes. Its location and strong regulation by iron has indicated it plays an important role in iron absorption. Expression of Dcytb in cells (Caco-2 and MDCK) was found to increase both ferric reductase activity and stimulate uptake of 59Fe. An additional increase in cupric reductase activity was found in MDCK (Madin–Darby canine kidney) cells expressing Dcytb. Expression and purification of Dcytb in insect cells reveals that Dcytb is a di-haem protein and that the haems are reducible by ascorbate, indicating that ascorbate is the likely intracelluar electron donor. Studies underway in Dcytb-knockout mice reveal that Dcytb is the only iron-regulated ferric reductase in the duodenal mucosa and that loss of Dcytb affects iron absorption.
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December 2008
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Conference Article|
November 19 2008
The role of Dcytb in iron metabolism: an update
Andrew T. McKie
Andrew T. McKie
1
1Division of Nutritional Sciences, King's College London, Franklin–Wilkins Building, 150 Stamford Street, London SE1 9NH, U.K.
1email andrew.t.mckie@kcl.ac.uk
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Publisher: Portland Press Ltd
Received:
June 13 2008
Online ISSN: 1470-8752
Print ISSN: 0300-5127
© The Authors Journal compilation © 2008 Biochemical Society
2008
Biochem Soc Trans (2008) 36 (6): 1239–1241.
Article history
Received:
June 13 2008
Citation
Andrew T. McKie; The role of Dcytb in iron metabolism: an update. Biochem Soc Trans 1 December 2008; 36 (6): 1239–1241. doi: https://doi.org/10.1042/BST0361239
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