Sulfur transfer onto MOCS2A is closely preceded by its adenylylation and deadenylylation. After release of MOCS2A-CO-S(1-), two cysteines on MOCS3 form a disulfide bridge. This means that MOCS3 has to be reduced to be able to participate in the next round. The reducing agent is not known (Marelja et al, 2008).
Leimkühler, S, Nimtz, M, Stöcklein, W, Marelja, Z
sulfurtransferase activity of MOCS3-S-S(1-):Zn2+ [cytosol]
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