1.1.1.3	Calmodulin	in the presence of above 0.1 mM Ca2+	246395	
1.1.1.3	dithiothreitol	the enzyme is 2.5fold activated by the addition of 0.8 mM dithiothreitol. The activation is caused by cleavage of the disulfide bond formed between two cysteine residues in the C-terminal regions of the two subunits	739972	
1.1.1.3	additional information	the HSD from the hyperthermophilic archaeon Sulfolobus tokodaii (StHSD) is activated by reductive cleavage of the disulfide bond formed between cysteine residues (Cys304) in the C-terminal regions of the homodimer subunits	762453