Abstract
Monoclonal antibodies (mAbs) were generated to the extracellular domain of transcobalamin receptor (TCblR) and used to identify the regions of the receptor protein involved in antibody binding. Based on the effect of transcobalamin bound cobalamin (TC-Cbl) on antibody binding, this study identified both blocking and binding antibodies. Both types of antibodies bind apo as well as holo receptors, whereas the blocking antibody when bound to the apo receptor prevents the binding and cellular uptake of TC-Cbl. Binding of these antibodies to truncated receptor constructs has identified the peptide domains of the receptor involved in antibody binding. These antibodies have potential utility in blocking cellular uptake of Cbl and delivery of drugs via TCblR, which is over-expressed in many cancers.
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