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Crystal structure of the WT SPL from Geobacillus thermodenitrificans which contains a SAM and a dinucleoside SP in the enzyme active site. The distance between the SP methylene carbon to the conserved cysteine (C140) was found to be 4.6 Å, and that between the methylene carbon and a conserved tyrosine (Y98) was found to be 4.3 Å.
