Transcription of the anti-viral guanylate-binding protein (GBP) is induced by interferon-gamma during macrophage induction. This family contains GBP1 and GPB2, both GTPases capable of binding GTP, GDP and GMP.

1: Structure of human guanylate-binding protein 1 representing a unique class of GTP-binding proteins. Prakash B, Praefcke GJ, Renault L, Wittinghofer A, Herrmann C; Nature 2000;403:567-571. PMID:10676968