G-protein-signaling modulator 2 - P81274 (GPSM2_HUMAN)


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Plays an important role in mitotic spindle pole organization via its interaction with NUMA1 (PubMed:11781568, PubMed:15632202, PubMed:21816348). Required for cortical dynein-dynactin complex recruitment during metaphase (PubMed:22327364). Plays a role in metaphase spindle orientation (PubMed:22327364). Plays also an important role in asymmetric cell divisions (PubMed:21816348). Has guanine nucleotide dissociation inhibitor (GDI) activity towards G(i) alpha proteins, such as GNAI1 and GNAI3, and thereby regulates their activity (By similarity). UniProt
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Subunit Structure
Interacts with the dynein-dynactin complex; this interaction is inhibited in a PLK1-dependent manner (PubMed:22327364). Part of a spindle orientation complex at least composed of GNAI1, GPSM2 and NUMA1 (PubMed:26766442). Interacts with LLGL2 (PubMed:15632202). Interacts (via TPR repeat region) with INSC/inscuteable (PubMed:16458856, PubMed:22074847). Interacts (via TPR repeat region) with NUMA1 (via C-terminus); this interaction is direct, inhibited in a PLK1-dependent manner, prevents the binding of NUMA1 with SPAG5 and promotes spindle pole organization (PubMed:11781568, PubMed:22327364, PubMed:27462074). INSC and NUMA1 compete for the same binding site, but INSC has higher affinity and can displace NUMA1 (in vitro) (PubMed:22074847). Interacts with GNAI2 (PubMed:8973305). Interacts (via GoLoco domains) with the GDP-bound form of GNAI1 and GNAI3; has much lower affinity for the GTP-bound form. Interaction with GDP-bound GNAI3 strongly enhances the affinity for NUMA1 (By similarity). Interacts (via TPR repeat region) with FRMPD1 (PubMed:22074847). INSC and FRMPD1 compete for the same binding site, but INSC has higher affinity and can displace FRMPD1 (in vitro) (By similarity). Interacts (via TPR repeat region) with FRMPD4 (PubMed:22074847, PubMed:25664792). Identified in a complex with INSC and F2RL2/Par3 (PubMed:16458856). UniProt
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