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Phosphoethanolamine methyltransferases add three methyl groups successively to their substrate to produce phosphocholine, an important precursor for phospholipid biosynthesis in diverse organisms. New work from Lee and Jez reveals critical domain movements that explain how multiple methylation reactions are uniquely coordinated by plant methyltransferases and provides insights into the evolution of this class of enzymes.
Acquisition and distribution of metal ions support a number of biological processes. Here we show that respiratory growth of and iron acquisition by the yeast Saccharomyces cerevisiae relies on potassium (K+) compartmentalization to the trans-Golgi network via Kha1p, a K+/H+ exchanger. K+ in the trans-Golgi network facilitates binding of copper to the Fet3p multi-copper ferroxidase.
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