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- W2006756004 abstract "Human serum transferrin (hTF) is an iron transport protein, comprising two lobes (N and C), each containing a single metal-binding center. Despite substantial structural similarity between the two lobes, studies have demonstrated the existence of significant differences in their metal-binding properties. The nature of these differences has been elucidated through the use of electrospray ionization mass spectrometry to study both metal retention and conformational properties of hTF under a variety of conditions. In the absence of chelating agents or nonsynergistic anions, the diferric form of hTF remains intact until the pH is lowered to 4.5. The monoferric form of hTF retains the compact conformation until the pH is lowered to 4.0, whereas the apoprotein becomes partially unfolded at pH as high as 5.5. Selective (lobe-specific) modulation of the iron-binding properties of hTF using recombinant forms of the protein (in which the pH-sensitive elements in each lobe were mutated) verifies that the N-lobe of the protein has a lower affinity for ferric ion. Surprisingly, the apo-N-lobe is significantly less flexible compared to the apo-C-lobe. Furthermore, the conformation of the iron-free N-lobe is stabilized when the C-lobe contains iron, confirming the existence of an interlobe interaction within the protein. The experimental results provide strong support for the earlier suggestion that hTF interacts with its receptor (TFR) primarily through the C-lobe both at the cell surface and inside the endosome." @default.
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- W2006756004 date "2003-04-16" @default.
- W2006756004 modified "2023-10-09" @default.
- W2006756004 title "Interlobe Communication in Human Serum Transferrin: Metal Binding and Conformational Dynamics Investigated by Electrospray Ionization Mass Spectrometry" @default.
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- W2006756004 doi "https://doi.org/10.1021/bi020660b" @default.
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