Class Ia Phosphatidylinositol 3-Kinase

**Definition:** A phosphatidylinositol 3-kinase subclass that includes enzymes formed through the heterodimerization of a p110 catalytic and a p85, p55, or p50 regulatory subunit. This subclass of enzymes is a downstream target of TYROSINE KINASE RECEPTORS and G PROTEIN-COUPLED RECEPTORS.

**Tree numbers:** - D08.811.913.696.620.500.100.100.100 - D08.811.913.696.620.500.200.100.100 - D12.776.476.556.100.100.100 - D12.776.476.556.200.100.100

**Synonyms:** - Class Ia Phosphatidylinositol 3-Kinases - Phosphatidylinositol 3-Kinase, Class Ia