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Facts about Phosphatidylinositol 3-kinase regulatory subunit alpha.
Plays an important role in signaling in response to FGFR1, FGFR2, FGFR3, FGFR4, KITLG/SCF, KIT, PDGFRA and PDGFRB. Likewise, plays a role in ITGB2 signaling (PubMed:17626883, PubMed:19805105, PubMed:7518429).
| Human | |
|---|---|
| Gene Name: | PIK3R1 |
| Uniprot: | P27986 |
| Entrez: | 5295 |

| Belongs to: |
|---|
| PI3K p85 subunit family |

GRB1; GRB1PI3-kinase subunit p85-alpha; p85; p85-ALPHA; Phosphatidylinositol 3-kinase 85 kDa regulatory subunit alpha; phosphatidylinositol 3-kinase regulatory subunit alpha; phosphatidylinositol 3-kinase, regulatory subunit, polypeptide 1 (p85 alpha); phosphatidylinositol 3-kinase, regulatory, 1; phosphatidylinositol 3-kinase-associated p-85 alpha; phosphoinositide-3-kinase, regulatory subunit 1 (alpha); PI 3Kinase p85 alpha; PI 3-Kinase p85 alpha; PI3K regulatory subunit alpha; PI3-kinase regulatory subunit alpha; PIK3R1; PtdIns-3-kinase regulatory subunit alpha; PtdIns-3-kinase regulatory s
Mass (kDA):
83.598 kDA

| Human | |
|---|---|
| Location: | 5q13.1 |
| Sequence: | 5; NC_000005.10 (68215737..68301821) |
Isoform 2 is expressed in skeletal muscle and brain, and at lower levels in kidney and cardiac muscle. Isoform 2 and isoform 4 are present in skeletal muscle (at protein level).




PMID: 1849461 by Skolnik E.Y., et al. Cloning of PI3 kinase-associated p85 utilizing a novel method for expression/cloning of target proteins for receptor tyrosine kinases.
PMID: 8628286 by Antonetti D.A., et al. Insulin receptor substrate 1 binds two novel splice variants of the regulatory subunit of phosphatidylinositol 3-kinase in muscle and brain.
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