?:definition
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Catalysis of the reaction: 2 S-adenosyl-L-methionine + a [ribosomal protein S12] L-aspartate89 + a sulfurated [sulfur carrier] + a reduced electron acceptor = S-adenosyl-L-homocysteine + L-methionine + 5\'-deoxyadenosine + 2 H+ + a [ribosomal protein S12] 3-methylthio-L-aspartate89 + an unsulfurated [sulfur carrier] + an oxidized electron acceptor. [EC:2.8.4.4, GOC:pz]
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