Background: The mammalian bombesin receptor family comprises three G proteincoupled
receptors: the neuromedin B receptor, the gastrin-releasing peptide receptor (BB2), and the
bombesin receptor subtype 3. BB2 receptor plays a role in gastrointestinal functions; however, at present
the role of this subtype in physiological and pathological conditions is unknown due to the lack
of specific binders for all subclasses of bombesin receptors.
Results: Here, we present a study focused on the properties of the peptoid bombesin antagonist called
PD176252, and other structural analogues with the aim to elucidate causes of their different affinity
towards the BB2 receptor.
Conclusion: By means of computational techniques, based on QSAR, docking and homology building,
supported by experimental data (X-ray diffraction and NMR spectroscopy) fresh insights on
binding modes of this class of biological targets were achieved.