PIK3R1

Phosphatidylinositol 3-kinase regulatory subunit alpha is an is_associated_with::enzyme that in humans is encoded by the PIK3R1 is_associated_with::gene.

Function
is_associated_with::Phosphatidylinositol 3-kinase phosphorylates the is_associated_with::inositol ring of is_associated_with::phosphatidylinositol at the 3-prime position. The enzyme comprises a 110 kD catalytic subunit and a regulatory subunit of either 85, 55, or 50 kD. This gene encodes the 85 kD regulatory subunit. Phosphatidylinositol 3-kinase plays an important role in the metabolic actions of is_associated_with::insulin, and a mutation in this gene has been associated with is_associated_with::insulin resistance. Alternative splicing of this gene results in three transcript variants encoding different isoforms.

Clinical significance
Mutations in PIK3R1 are implicated in cases of breast cancer.

Mutations in PIK3R1 are associated to SHORT syndrome.

Interactions
PIK3R1 has been shown to interact with:


 * is_associated_with::ADAM12,
 * is_associated_with::BCAR1,
 * CBLB,
 * is_associated_with::CD117,
 * is_associated_with::CD28,
 * is_associated_with::CD7,
 * is_associated_with::CENTG1,
 * CBL,
 * EPHA2,
 * EPOR,
 * is_associated_with::ERBB3,
 * EZR,
 * is_associated_with::FCGR2A,
 * is_associated_with::GAB1,
 * is_associated_with::GAB2,
 * is_associated_with::Grb2,
 * is_associated_with::HRAS,
 * is_associated_with::IRS1
 * is_associated_with::IRS2,
 * IL1R1,
 * JAK2,
 * is_associated_with::KHDRBS1,
 * LTK,
 * LAT,
 * LCP2,
 * PIK3CD,
 * is_associated_with::PTK2,
 * SHB,
 * is_associated_with::TUBA1B,
 * is_associated_with::TYRO3,
 * is_associated_with::VAV1, and
 * WAS.