Javascript is not enabled on this browser. This site will not work properly without Javascript.
PhosphoSitePlus Homepage Cell Signaling Technology
Home | Login
About PhosphoSiteUsing PhosphoSiteprivacy & cookiesCuration ProcessContact
logos LINCs Logo Mt Sinai Logo NIH Logo NCI Logo
Search / Browse Functions
Protein Page:

LKB1 a S/T protein kinase of the CAMKL family. A tumor suppressor that helps control cell structure, polarity, apoptosis and energy homeostasis. Phosphorylates AGS3 (activator of G-protein signaling 3) GPR domains, regulating the interaction of GPR-containing proteins with G-proteins. A cytosolic protein complex comprised of LKB1, the pseudokinase STRAD, and the MO25 scaffold protein. Activates AMPK and several related protein kinases. AMPK plays a predominant role as the master regulator of cellular energy homeostasis, controlling downstream effectors that regulate cell growth and apoptosis in response to cellular ATP concentrations. The Lkb1/Strad/Mo25 complex can polarize single epithelial cells, leading to the formation of a brush border containing microvilli on the apical surface. Mutation in the corresponding gene causes Peutz-Jeghers syndrome (PJS), an autosomal dominant disorder characterized by benign GI tract polyps and dark skin lesions of the mouth, hands and feet. A variety of other LKB1 gene mutations have been associated with the formation of sporadic cancers in several tissues. Note: This description may include information from UniProtKB.
Protein type: Autophagy; CAMK group; CAMKL family; EC; Kinase, protein; LKB subfamily; Protein kinase, CAMK; Protein kinase, Ser/Thr (non-receptor); Tumor suppressor
Chromosomal Location of Human Ortholog: 19p13.3
Cellular Component: cytoplasm; cytosol; membrane; mitochondrion; nucleoplasm; nucleus
Molecular Function: ATP binding; magnesium ion binding; p53 binding; protein binding; protein kinase activator activity; protein serine/threonine kinase activity
Biological Process: anoikis; cell cycle arrest; cell differentiation; establishment of cell polarity; glucose homeostasis; negative regulation of cell growth; negative regulation of cell proliferation; nervous system development; peptidyl-serine phosphorylation; peptidyl-threonine phosphorylation; positive regulation of autophagy; positive regulation of transforming growth factor beta receptor signaling pathway; protein amino acid autophosphorylation; protein amino acid phosphorylation; regulation of cell growth; response to DNA damage stimulus; response to ionizing radiation; vasculature development
Disease: Pancreatic Cancer; Peutz-jeghers Syndrome; Testicular Germ Cell Tumor
Reference #:  Q15831 (UniProtKB)
Alt. Names/Synonyms: LKB1; PAR-4; PAR4; PJS; polarization-related protein LKB1; Renal carcinoma antigen NY-REN-19; serine/threonine kinase 11; Serine/threonine-protein kinase 11; Serine/threonine-protein kinase LKB1; STK11
Gene Symbols: STK11
Molecular weight: 48,636 Da
Basal Isoelectric point: 7.12  Predict pI for various phosphorylation states
CST Pathways:  AMPK Signaling  |  Insulin Receptor Signaling  |  mTOR Signaling  |  Translation: eIF4E and p70S6K  |  Warburg Effect
Protein-Specific Antibodies or siRNAs from Cell Signaling Technology® Total Proteins
Select Structure to View Below


Protein Structure Not Found.
Download PyMol Script
Download ChimeraX Script

Substrate Sequence Logo
Sequence Logo

STRING  |  cBioPortal  |  Wikipedia  |  Reactome  |  neXtProt  |  Protein Atlas  |  BioGPS  |  Scansite  |  KinBase  |  Pfam  |  RCSB PDB  |  ENZYME  |  Phospho3D  |  Phospho.ELM  |  NetworKIN  |  GeneCards  |  UniProtKB  |  Entrez-Gene  |  GenPept  |  Ensembl Gene  |  InnateDB