Cysteine desulfurase IscS

UniProtKB accession:  P0A6B9

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UniProtKB description:  Master enzyme that delivers sulfur to a number of partners involved in Fe-S cluster assembly, tRNA modification or cofactor biosynthesis (biotin, thiamine, molybdopterin). Catalyzes the removal of elemental sulfur and selenium atoms from cysteine and selenocysteine to produce alanine, then delivers the sulfur to an acceptor protein such as CyaY, IscU, IscX, MoaD/MoeB, ThiI, or TusA. Transfers sulfur to acceptor proteins via a transpersulfidation reaction; the flexibility of the persulfide sulfur-carrying Cys-328 allows it to reach different partners docked on the homodimer surface. May function as a selenium delivery protein in the pathway for the biosynthesis of selenophosphate.