Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
10872588 | FEBS Letters | 2007 | 6 Pages |
Abstract
The activity of one of the eukaryotic initiation factor 2α kinases, heme-regulated inhibitor (HRI), is modulated by heme binding. Here, we demonstrate for the first time that Hg2+ strongly inhibits the function of HRI (IC50 = 0.6 μM), and nitric oxide fully reverses this inhibition. Other divalent metal cations, such as Fe2+, Cu2+, Cd2+, Zn2+ and Pb2+, also significantly inhibit kinase activity with IC50 values of 1.9-8.5 μM. Notably, inhibition by cations other than Hg2+ is not reversed by nitric oxide. Our present data support dual roles of Hg2+ and nitric oxide in the regulation of protein synthesis during cell emergency states.
Keywords
Related Topics
Life Sciences
Agricultural and Biological Sciences
Plant Science
Authors
Marketa Martinkova, Jotaro Igarashi, Toru Shimizu,