Abstract

The protein MA4561 from the archaeon Methanosarcina acetivorans is not the phytochrome-like photoreceptor that it was first thought to be, but is instead a heme-binding protein that likely acts as a redox sensor, according to Nicole Frankenberg-Dinkel at the Ruhr-Universitat in Bochum, Germany, and her collaborators. While some bacteria use heme-containing proteins as redox sensors, M. acetivorans is the first archaeon known to do so, she says. Details appeared May 9, 2013 in the Journal of Biological Chemistry (doi: 10.1074/jbc.M113.476267 jbc.M113.476267).

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