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<p>Earlier this month, a new kind of covalent linkage between the
sidechains of Lys and Cys was reported in Nature, a
Nitrogen-Oxygen-Sulfur (NOS) bond. In the initial case of the
transaldolases studied, it serves as an allosteric redox switch
for enzymatic activity. NOS appears likely to occur in proteins in
all domains of life including <i>Homo sapiens</i>, apparently
overlooked in earlier interpretations of electron density maps.</p>
<p>Have a look at this new page:<br>
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<p><a class="moz-txt-link-freetext" href="https://proteopedia.org/w/Lysine-cysteine_NOS_bonds">https://proteopedia.org/w/Lysine-cysteine_NOS_bonds</a></p>
<p>-Eric</p>
<p>P.S. Thanks to crystallographer Fadel Samatey for pointing out
the original report to me.<br>
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