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HAHAHA, HEHEHE, HIHIHI, or HKHKHK: influence of position and composition of histidine containing tags on biodistribution of [(99m)Tc(CO)3](+)-labeled affibody molecules. | LitMetric

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Article Abstract

Engineered affibody molecules can be used for high contrast in vivo molecular imaging. Extending a recombinantly produced HER2 binding affibody molecule with a hexa-histidine tag allows for convenient purification by immobilized metal-ion affinity chromatography and labeling with [(99m)Tc(CO)3](+) but increases radioactivity uptake in the liver. To investigate the impact of charge, lipophilicity, and position on biodistribution, 10 variants of a histidine-based tag was attached to a HER2 binding affibody molecule. The biochemical properties and the HER2 binding affinity appeared to be similar for all variants. In vivo, positive charge promoted liver uptake. For N-terminally placed tags, lipophilicity promoted liver uptake and decreased kidney uptake. Kidney uptake was higher for C-terminally placed tags compared to their N-terminal counterparts. The variant with the amino acid composition HEHEHE placed in the N-terminus gave the lowest nonspecific uptake.

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http://dx.doi.org/10.1021/jm400218yDOI Listing

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