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PIK3C3

Enables 1-phosphatidylinositol-3-kinase activity. Involved in early endosome to late endosome transport and regulation of cytokinesis. Acts upstream of or within autophagy and protein lipidation. Located in autolysosome; late endosome; and midbody.
Protein class

Enzymes, Metabolic proteins

Predicted location

Intracellular

Single cell type specificity

Cell type enhanced (Oligodendrocytes, Excitatory neurons, Inhibitory neurons)

Immune cell specificity

Low immune cell specificity

Cell line specificity

Low cell line specificity

Interaction

Component of the PI3K (PI3KC3/PI3K-III/class III phosphatidylinositol 3-kinase) complex the core of which is composed of the catalytic subunit PIK3C3, the regulatory subunit PIK3R4 and BECN1 associating with additional regulatory/auxilliary subunits to form alternative complex forms. Alternative complex forms containing a forth regulatory subunit in a mutually exclusive manner are: the PI3K complex I (PI3KC3-C1) containing ATG14, and the PI3K complex II (PI3KC3-C2) containing UVRAG. PI3KC3-C1 displays a V-shaped architecture with PIK3R4 serving as a bridge between PIK3C3 and the ATG14:BECN1 subcomplex. Both, PI3KC3-C1 and PI3KC3-C2, can associate with further regulatory subunits such as RUBCN, SH3GLB1/Bif-1 and AMBRA1 (PubMed:7628435, PubMed:19050071, PubMed:20643123, PubMed:19270696, PubMed:23878393, PubMed:25490155). PI3KC3-C1 probably associates with PIK3CB (By similarity). Interacts with RAB7A in the presence of PIK3R4 (PubMed:14617358). Interacts with AMBRA1 (By similarity). Interacts with BECN1P1/BECN2 (PubMed:23954414). Interacts with SLAMF1(PubMed:22493499). May be a component of a complex composed of RAB5A (in GDP-bound form), DYN2 and PIK3C3 (By similarity). Interacts with NCKAP1L (PubMed:16417406). Interacts with ATG14; this interaction is increased in the absence of TMEM39A (PubMed:31806350). Interacts with STEEP1; the interaction is STING1-dependent and required for trafficking of STING1 from the endoplasmic reticulum (PubMed:32690950). Interacts with YWHAG (PubMed:33473107).

Molecular function

Kinase, Transferase

More Types Infomation

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