Page last updated: 2024-10-24

phosphatidylinositol 3-kinase complex, class III, type I

Definition

Target type: cellularcomponent

A class III phosphatidylinositol 3-kinase complex that is involved in autophagy. In budding yeast, this complex consists of Vps30p, Vps34p, Apg14p and Vps15p. [GOC:ha, GOC:rb, PMID:11157979, PMID:16421251]

The phosphatidylinositol 3-kinase (PI3K) complex, class III, type I, is a multi-protein complex involved in the regulation of autophagy and other cellular processes. This complex is comprised of four core components:

1. **VPS34 (vacuolar protein sorting 34)**: This is the catalytic subunit of the complex, responsible for the phosphorylation of phosphatidylinositol (PtdIns) to produce phosphatidylinositol-3-phosphate (PtdIns(3)P). VPS34 is a lipid kinase that belongs to the PI3K family.

2. **VPS15 (vacuolar protein sorting 15)**: This is a regulatory subunit that acts as a scaffold protein, interacting with VPS34 and other components of the complex. VPS15 is also a protein kinase and is required for the activation of VPS34.

3. **ATG14 (autophagy-related protein 14)**: This protein is essential for the formation of autophagosomes, the double-membrane vesicles that engulf cellular components during autophagy. ATG14 binds to VPS34 and VPS15, and its presence directs the complex to specific membranes where autophagosome formation occurs.

4. **Beclin 1 (BECN1)**: This protein is a key regulator of autophagy and plays a critical role in the initiation of autophagosome formation. Beclin 1 interacts with VPS34, VPS15, and ATG14, and its phosphorylation by VPS15 promotes the activation of the complex.

The class III PI3K complex type I is localized to specific cellular compartments, including the endoplasmic reticulum (ER), the Golgi apparatus, and endosomes. It is also found at sites of autophagosome formation. The complex is involved in a variety of cellular processes, including autophagy, vesicle trafficking, and membrane homeostasis.
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Proteins (1)

ProteinDefinitionTaxonomy
Phosphatidylinositol 3-kinase catalytic subunit type 3A phosphatidylinositol 3-kinase catalytic subunit type 3 that is encoded in the genome of human. [PRO:DNx]Homo sapiens (human)

Compounds (23)

CompoundDefinitionClassesRoles
ML162ML162 : A monochlorobenzene that is benzene substituted by (chloroacetyl){2-oxo-2-[(2-phenylethyl)amino]-1-(thiophen-2-yl)ethyl}amino, chloro and methoxy groups at positions 1, 3 and 4, respectively. It is a covalent inhibitor of glutathione peroxidase 4 (GPX4) that induces ferroptosis in cells.monochlorobenzenes;
monomethoxybenzene;
organochlorine compound;
secondary carboxamide;
tertiary carboxamide;
thiophenes
EC 1.11.1.9 (glutathione peroxidase) inhibitor;
ferroptosis inducer
PI3-Kinase alpha Inhibitor 2organic heterobicyclic compound;
organonitrogen heterocyclic compound;
organosulfur heterocyclic compound
idelalisibidelalisib : A member of the class of quinazolines that is 5-fluoro-3-phenylquinazolin-4-one in which the hydrogen at position 2 is replaced by a (1S)-1-(3H-purin-6-ylamino)propyl group. used for for the treatment of refractory indolent non-Hodgkin's lymphoma and relapsed chronic lymphocytic leukemia.

idelalisib: an antineoplastic agent and p110delta inhibitor; structure in first source
aromatic amine;
organofluorine compound;
purines;
quinazolines;
secondary amino compound
antineoplastic agent;
apoptosis inducer;
EC 2.7.1.137 (phosphatidylinositol 3-kinase) inhibitor
zstk474ZSTK-474 : A triamino-1,3,5-triazine that is 1,3,5-triazine in which two of the hydrogens have been replaced by morpholin-4-yl groups while the third hydrogen has been replaced by a 2-(difluoromethyl)benzimidazol-1-yl group. It is an inhibitor of phosphatidylinositol 3-kinase.benzimidazoles;
morpholines;
organofluorine compound;
triamino-1,3,5-triazine
antineoplastic agent;
EC 2.7.1.137 (phosphatidylinositol 3-kinase) inhibitor
dactolisibdactolisib : An imidazoquinoline that is 3-methyl-2-oxo-2,3-dihydro-1H-imidazo[4,5-c]quinoline substituted at position 1 by a 4-(1-cyanoisopropyl)phenyl group and at position 8 by a quinolin-3-yl group. A dual PI3K/mTOR inhibitor used in cancer treatment.

dactolisib: antineoplastic agent that inhibits both phosphatidylinositol 3-kinase and mTOR
imidazoquinoline;
nitrile;
quinolines;
ring assembly;
ureas
antineoplastic agent;
EC 2.7.1.137 (phosphatidylinositol 3-kinase) inhibitor;
mTOR inhibitor
ku 60019
buparlisibNVP-BKM120: a pan class I PI3 kinase inhibitor with antineoplastic activity; structure in first sourceaminopyridine;
aminopyrimidine;
morpholines;
organofluorine compound
antineoplastic agent;
EC 2.7.1.137 (phosphatidylinositol 3-kinase) inhibitor
gdc 0941pictrelisib : A sulfonamide composed of indazole, morpholine, and methylsulfonyl-substituted piperazine rings bound to a thienopyrimidine ring.indazoles;
morpholines;
piperazines;
sulfonamide;
thienopyrimidine
EC 2.7.1.137 (phosphatidylinositol 3-kinase) inhibitor
gdc 0980
azd2014vistusertib: potent and selective dual mTORC1 and mTORC2 inhibitor; structure in first source
pki 587gedatolisib: inhibits both phosphatidylinositol 3-kinase and mTOR; structure in first source
5-(4-amino-1-propan-2-yl-3-pyrazolo[3,4-d]pyrimidinyl)-1,3-benzoxazol-2-aminesapanisertib: an mTOR inhibitorbenzoxazole
ch 5132799CH 5132799: structure in first source
torin 1torin 1 : A member of the class of pyridoquinolines that is 9-(quinolin-3-yl)benzo[h][1,6]naphthyridin-2-one bearing an additional 4-(4-propionylpiperazin-1-yl)-3-(trifluoromethyl)phenyl substituent at position 1. It is a potent inhibitor of mTOR and exhibits anti-cancer properties.N-acylpiperazine;
N-arylpiperazine;
organofluorine compound;
pyridoquinoline;
quinolines
antineoplastic agent;
mTOR inhibitor
gdc-0032
spautin-1
torin 2torin 2 : A member of the class of pyridoquinolines that is benzo[h][1,6]naphthyridin-2-one carrying additional 3-(trifluoromethyl)phenyl and 6-aminopyridin-3-yl substituents at positions 1 and 9 respectively. It is a potent inhibitor of mTOR and exhibits anti-cancer properties.aminopyridine;
organofluorine compound;
primary amino compound;
pyridoquinoline
antineoplastic agent;
mTOR inhibitor
cudc-907
sar245408
byl719proline derivative
amg 511AMG 511: structure in first source
cc-223
sar405SAR405: a Vps34 inhibitor with antineoplastic activity; structure in first source