Seems to be a coreceptor in inhibin signaling, but seems not to be a high-affinity inhibin receptor. Antagonizes activin A signaling in the presence or absence of inhibin B. Necessary to mediate a specific antagonistic effect of inhibin B on activin-stimulated transcription.
Specificity
Natural and recombinant Mouse Immunoglobulin superfamily member 1
Interacts with INHA; the interaction is not confirmed by standard receptor binding assays (By similarity). Interacts with ACVR1B; the interaction appears to be ligand-dependent as it is diminished by inhibin B and activin A. Interacts with ACVR2A, ACVR2B, ACVRL1 and BMPR1B (By similarity). Interacts with HECTD1.