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Single transporter for sulfate, selenate, and selenite in Escherichia coli K-12
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A Michaelis-Menten kinetic analysis of the transport of sulfate, selenate, and selenite into Escherichia coli K-12 showed that the three dianions were transported by the same carrier. Km values, used as a measure of the affinity of each ligand for the carrier, showed that sulfate was bound 5 times more tightly than selenate and 37 times more tightly than selenite. The specificity ratio, Vmax/Km, also indicated that sulfate was the preferred ligand. There was little difference in the ratios for selenate and selenite.
Title: Single transporter for sulfate, selenate, and selenite in Escherichia coli K-12
Description:
A Michaelis-Menten kinetic analysis of the transport of sulfate, selenate, and selenite into Escherichia coli K-12 showed that the three dianions were transported by the same carrier.
Km values, used as a measure of the affinity of each ligand for the carrier, showed that sulfate was bound 5 times more tightly than selenate and 37 times more tightly than selenite.
The specificity ratio, Vmax/Km, also indicated that sulfate was the preferred ligand.
There was little difference in the ratios for selenate and selenite.
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