期刊
FEBS LETTERS
卷 581, 期 7, 页码 1505-1508出版社
WILEY
DOI: 10.1016/j.febslet.2007.03.006
关键词
iron metabolism; Redox titration; trans-Membrane electron transfer; two-heme cytochrome b561; vacuole
资金
- NCRR NIH HHS [1P20RR17675] Funding Source: Medline
Ascorbate-reducible cytochromes b561 (Cyts-b561) are a class of intrinsic trans-membrane proteins. Tonoplast Cyt-b561 (TCytb), one of the four Cyt-b561 isoforms in Arabidopsis was localized to the tonoplast. We demonstrate here that the optical spectra, EPR spectra and redox potentials of recombinant TCytb are similar to those of the well characterized bovine chromaffin granule Cyt-b561. We provide evidence for the reduction of ferric-chelates by the reduced TCytb. It is also shown that TCytb is capable of trans-membrane electron transport from intracellular ascorbate to extracellular ferric-chelates in yeast cells. (c) 2007 Federation of European Biochemical Societies. Published by Elsevier B.V. All rights reserved.
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