Molecular scaffold protein for various multimeric protein complexes. Involved in response to hypoxia by acting as a negative regulator of HIF1A/HIF-1-alpha via its interaction with EGLN3/PHD3. May promote degradation of HIF1A. May act by recruiting signaling complexes to a specific upstream activator (By similarity). Also acts as a module in the assembly of a multicomponent scaffold for the ERK pathway, linking ERK responses to specific agonists. At low concentrations it enhances ERK activation, whereas high concentrations lead to the inhibition of ERK activation. May also be involved in pre-mRNA splicing. Interacts with EGLN3/PHD3. Identified in the spliceosome C complex (By similarity). Interacts with ERK signaling proteins MAP2K1/MEK1, MAP2K2/MEK2, LAMTOR3, ARAF/Raf-1, MAPK1/ERK2 and MAPK3/ERK1. Predominantly cytoplasmic. Partially nuclear. Ubiquitous. Belongs to the WD repeat MORG1 family.