Torin 1, mTOR inhibitor

Supplementary information

This supplementary information is collated from multiple sources and compiled automatically.

DNA-PKcs also known as DNA-dependent protein kinase catalytic subunit is a large serine/threonine protein kinase with a mass of approximately 469 kDa. It is mainly expressed in the nucleus of cells and is involved in DNA damage repair processes. Another key molecule mTOR (mechanistic target of rapamycin) a 289 kDa protein integrates signals for nutrient and energy status to control cell growth. PI 3 Kinase family members including PI 3 Kinase p110 delta PI 3 Kinase p85 alpha VPS34 (Class III PI3K) PI 3 Kinase catalytic subunit alpha/PIK3CA PI 3 Kinase Class 2A/Cpk and PI 3 Kinase catalytic subunit gamma/PI3K-gamma contribute to various cellular functions through lipid signaling within the cytoplasm and plasma membrane. PI4 kinase beta (PI4KB) facilitates phosphatidylinositol 4-phosphate production relevant in multiple cell processes.

Biological function summary

DNA-PKcs plays a vital role in the non-homologous end joining (NHEJ) repair pathway essential for fixing DNA double-strand breaks. mTOR is a central regulator of cell metabolism growth proliferation and survival. PI 3 Kinase proteins through phosphorylation of inositol lipids on the cell membrane involve themselves in signal transduction pathways that regulate cell growth proliferation survival and differentiation. Some PI 3 Kinases such as p110 delta and VPS34 function within specific complexes like the phosphatidylinositol 3-kinase complex I. CDC42 binding protein kinase alpha (also known as MRCK alpha) influences cytoskeletal dynamics and cell motility by interacting with small GTPase CDC42.

Pathways

These targets participate in key pathways such as the PI3K-AKT-mTOR signaling pathway and the DNA damage response (DDR) pathway. The PI3K-AKT-mTOR pathway featuring proteins like mTOR and PI 3 Kinase catalytic subunits is important for regulating cell growth and metabolism. In the DDR pathway DNA-PKcs and related proteins like ATM (ataxia-telangiectasia mutated) and ATR (ATM and Rad3-related) help in recognizing and repairing DNA damages. These pathways ensure cellular responses to external and internal stimuli maintaining cellular homeostasis and genomic integrity.

Dysregulation in these proteins links to conditions like cancer and diabetes. For instance mutations in PI 3 Kinase catalytic subunit alpha (PIK3CA) frequently occur in various cancers affecting cell proliferation and survival. Abnormal mTOR signaling is associated with metabolic disorders including type 2 diabetes due to its role in insulin signaling pathways. Furthermore DNA repair defects involving DNA-PKcs could contribute to the development of cancer particularly in combination with mutations in other DDR-related proteins such as BRCA1/2. These relations in pathways highlight the importance of these proteins in disease progression and therapeutic targeting.