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netLibrary - eBook Summary Structure-based Drug Design by ...

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Document<br />

Figure 5<br />

Velcro-key model of IFN-γ binding to its<br />

receptor. (From Reference 25. Copyright<br />

1992. The American Association of<br />

Immunologists.)<br />

Page 447<br />

results in decreased receptor binding [34]. Deletions or substitutions at the C- terminus have a direct<br />

effect on function of the molecule [35–38]. Epitope mapping of neutralizing monoclonal antibodies has<br />

also revealed an internal region of the molecule (from residues 84–94) as being functionally important<br />

[39]. This sequence bears strong homology to the nuclear localization sequence (NLS) of the SV40 large<br />

T antigen and has recently been demonstrated to be fully functional as an NLS for IFN-γ [40]. Thus,<br />

internal regions of the IFN-γ molecule are also likely to play an important functional role.<br />

B. IFN-γ Receptor α Chain Sites of Interaction with IFN-γ<br />

Both the human and the murine IFN-γ receptors consist of a ligand-binding subunit and a speciesspecific<br />

cofactor molecule. It is through interaction with this cell-surface receptor complex that IFN-γ<br />

exerts its biological effects. The IFN-γ molecule and its N-terminal peptide IFN-γ (1–39) bind<br />

specifically to the<br />

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