1.8.99.2 AMP + sulfite + acceptor = adenylyl sulfate + reduced acceptor - - 1.8.99.2 AMP + sulfite + acceptor = adenylyl sulfate + reduced acceptor catalysis involves a nucleophilic attack of the N5-atom of reduced FAD on the sulfur atom of the enzyme 393934 1.8.99.2 AMP + sulfite + acceptor = adenylyl sulfate + reduced acceptor mechanism -, 393943, 393952