PMID:15498577

Citation	Burman, JD, Harris, RL, Hauton, KA, Lawson, DM and Sawers, RG (2004) The iron-sulfur cluster in the L-serine dehydratase TdcG from Escherichia coli is required for enzyme activity. FEBS Lett. 576:442-4
Abstract	The anaerobically inducible L-serine dehydratase, TdcG, from Escherichia coli was characterized. Based on UV-visible spectroscopy, iron and labile sulfide analyses, the homodimeric enzyme is proposed to have two oxygen-labile [4Fe-4S]2+ clusters. Anaerobically isolated dimeric TdcG had a kcat of 544 s(-1) and an apparent KM for L-serine of 4.8 mM. L-threonine did not act as a substrate for the enzyme. Exposure of the active enzyme to air resulted in disappearance of the broad absorption band at 400-420 nm, indicating a loss of the [4Fe-4S]2+ cluster. A concomitant loss of dehydratase activity was demonstrated, indicating that integrity of the [4Fe-4S]2+ cluster is essential for enzyme activity.
Links	PubMed Online version:10.1016/j.febslet.2004.09.058
Keywords	Dimerization; Escherichia coli/enzymology; Escherichia coli Proteins/metabolism; Iron-Sulfur Proteins/metabolism; Kinetics; L-Serine Dehydratase/metabolism; Spectrophotometry; Sulfides/metabolism
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