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Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)

Vanadate-dependent photomodification of serine 319 and 321 in the active site of isocitrate lyase from Escherichia coli.

Vanadate was used as a substrate analogue to modify and subsequently localize active site serine residues of isocitrate lyase from Escherichia coli. Irradiation of the enzyme on ice with UV light in the presence of vanadate resulted in inactivation. Inactivation was prevented by the substrates glyoxylate or Ds-isocitrate and to a much lesser extent by succinate. Reduction of photoinactivated isocitrate lyase by NaBH4 partially restored enzyme activity. The photomodified enzyme was labeled by reduction with NaB[3H]4 in the presence and absence of the substrates succinate plus glyoxylate. Highly differential labeling of serine residues 319 and 321 in the absence of substrates suggests their importance in the action of isocitrate lyase. These residues are highly conserved in all five known sequences of this enzyme.[1]


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