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The HisJ protein from Escherichia coli and related Gram negative bacteria is the periplasmic component of a bacterial ATP‐cassette (ABC) transporter system. Together these proteins form a transmembrane complex that can take up L‐histidine from the environment and translocate it into the cytosol. We have studied the specificity of HisJ for binding L‐His and many related naturally occurring compounds...
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