STK11

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Serine/threonine kinase 11
LKB1 complex structure 2WTK.png
Structure of the heterotrimeric LKB1-STRAD?-MO25? complex.
Available structures
PDB Ortholog search: PDBe, RCSB
Identifiers
Symbols STK11 ; LKB1; PJS; hLKB1
External IDs OMIM602216 MGI1341870 HomoloGene393 ChEMBL: 5606 GeneCards: STK11 Gene
EC number 2.7.11.1
RNA expression pattern
PBB GE STK11 41657 at tn.png
PBB GE STK11 204292 x at tn.png
More reference expression data
Orthologs
Species Human Mouse
Entrez 6794 20869
Ensembl ENSG00000118046 ENSMUSG00000003068
UniProt Q15831 Q9WTK7
RefSeq (mRNA) NM_000455 NM_011492
RefSeq (protein) NP_000446 NP_035622
Location (UCSC) Chr 19:
1.19 – 1.23 Mb
Chr 10:
80.12 – 80.13 Mb
PubMed search [1] [2]

Serine/threonine kinase 11 (STK11) also known as liver kinase B1 (LKB1) or renal carcinoma antigen NY-REN-19 is a protein kinase that in humans is encoded by the STK11 gene.[1]

Expression[edit]

Testosterone and DHT treatment of murine 3T3-L1 or human SGBS adipocytes for 24 h significantly decreased the mRNA expression of LKB1 via the androgen receptor and consequently reduced the activation of AMPK by phosphorylation. In contrast, 17β-estradiol treatment increased LKB1 mRNA, an effect mediated by oestrogen receptor alpha.[2]

However in ER-positive breast cancer cell line MCF-7, estradiol caused a dose-dependent decrease in LKB1 transcript and protein expression leading to a significant decrease in the phosphorylation of the LKB1 target AMPK. ERα binds to the STK11 promoter in a ligand-independent manner and this interaction is decreased in the presence of estradiol. Moreover, STK11 promoter activity is significantly decreased in the presence of estradiol.[3]

Function[edit]

The STK11/LKB1 gene, which encodes a member of the serine/threonine kinase family, regulates cell polarity and functions as a tumour suppressor.

LKB1 is a primary upstream kinase of adenine monophosphate-activated protein kinase (AMPK), a necessary element in cell metabolism that is required for maintaining energy homeostasis. It is now clear that LKB1 exerts its growth suppressing effects by activating a group of ~14 other kinases, comprising AMPK and AMPK-related kinases. Activation of AMPK by LKB1 suppresses growth and proliferation when energy and nutrient levels are scarce. Activation of AMPK-related kinases by LKB1 plays vital roles maintaining cell polarity thereby inhibiting inappropriate expansion of tumour cells. A picture from current research is emerging that loss of LKB1 leads to disorganization of cell polarity and facilitates tumour growth under energetically unfavorable conditions.

Clinical significance[edit]

Germline mutations in this gene have been associated with Peutz-Jeghers syndrome, an autosomal dominant disorder characterized by the growth of polyps in the gastrointestinal tract, pigmented macules on the skin and mouth, and other neoplasms.[4][5][6] However, the LKB1 gene was also found to be mutated in lung cancer of sporadic origin, predominantly adenocarcinomas.[7] Further, more recent studies have uncovered a large number of somatic mutations of the LKB1 gene that are present in cervical, breast, intestinal, testicular, pancreatic and skin cancer.[8][9]

Activation[edit]

LKB1 is activated allosterically by binding to the pseudokinase STRAD and the adaptor protein MO25. The LKB1-STRAD-MO25 heterotrimeric complex represents the biologically active unit, that is capable of phosphorylating and activating AMPK and at least 12 other kinases that belong to the AMPK-related kinase family.

Structure[edit]

The crystal structure of the LKB1-STRAD-MO25 complex was elucidated using X-ray crystallography,[10] and revealed the mechanism by which LKB1 is allosterically activated. LKB1 has a structure typical of other protein kinases, with two (small and large) lobes on either side of the ligand ATP-binding pocket. STRAD and MO25 together cooperate to promote LKB1 active conformation. The LKB1 activation loop, a critical element in the process of kinase activation, is held in place by MO25, thus explaining the huge increase in LKB1 activity in the presence of STRAD and MO25 .

Splice variants[edit]

Alternate transcriptional splice variants of this gene have been observed and characterized. There are two main splice isoforms denoted LKB1 long (LKB1L) and LKB1 short (LKB1S). The short LKB1 variant is predominantly found in testes.

Interactions[edit]

STK11 has been shown to interact with:


References[edit]

  1. ^ Jenne DE, Reimann H, Nezu J, Friedel W, Loff S, Jeschke R, Müller O, Back W, Zimmer M (January 1998). "Peutz-Jeghers syndrome is caused by mutations in a novel serine threonine kinase". Nature Genetics 18 (1): 38–43. doi:10.1038/ng0198-38. PMID 9425897. 
  2. ^ McInnes KJ, Brown KA, Hunger NI, Simpson ER (August 2011). "Regulation of LKB1 expression by sex hormones in adipocytes". Int J Obes (Lond). doi:10.1038/ijo.2011.172. PMID 21876548. 
  3. ^ Brown KA, McInnes KJ, Takagi K, Ono K, Hunger NI, Wang L, Sasano H, Simpson ER (November 2011). "LKB1 expression is inhibited by estradiol-17β in MCF-7 cells". J. Steroid Biochem. Mol. Biol. 127 (3-5): 439–43. doi:10.1016/j.jsbmb.2011.06.005. PMID 21689749. 
  4. ^ Hemminki A, Tomlinson I, Markie D, Järvinen H, Sistonen P, Björkqvist AM, Knuutila S, Salovaara R, Bodmer W, Shibata D, de la Chapelle A, Aaltonen LA (January 1997). "Localization of a susceptibility locus for Peutz-Jeghers syndrome to 19p using comparative genomic hybridization and targeted linkage analysis". Nat. Genet. 15 (1): 87–90. doi:10.1038/ng0197-87. PMID 8988175. 
  5. ^ Hemminki A, Markie D, Tomlinson I, Avizienyte E, Roth S, Loukola A, Bignell G, Warren W, Aminoff M, Höglund P, Järvinen H, Kristo P, Pelin K, Ridanpää M, Salovaara R, Toro T, Bodmer W, Olschwang S, Olsen AS, Stratton MR, de la Chapelle A, Aaltonen LA (January 1998). "A serine/threonine kinase gene defective in Peutz-Jeghers syndrome". Nature 391 (6663): 184–7. doi:10.1038/34432. PMID 9428765. 
  6. ^ Scott R, Crooks R, Meldrum C (October 2008). "Gene symbol: STK11. Disease: Peutz-Jeghers Syndrome". Human Genetics 124 (3): 300. PMID 18846624. 
  7. ^ Sanchez-Cespedes M, Parrella P, Esteller M, Nomoto S, Trink B, Engles JM, Westra WH, Herman JG, Sidransky D. (2002). "Inactivation of LKB1/STK11 is a common event in adenocarcinomas of the lung.". Cancer Res. 62 (13): 3659–62. PMID 12097271. 
  8. ^ Sanchez-Cespedes M' (2007). "A role for LKB1 gene in human cancer beyond the Peutz-Jeghers syndrome.". Oncogene 26 (57): 7825–32. doi:10.1038/sj.onc.1210594. PMID 17599048. 
  9. ^ "Distribution of somatic mutations in STK11". Catalogue of Somatic Mutations in Cancer. Wellcome Trust Genome Campus, Hinxton, Cambridge. Retrieved 2009-11-11. 
  10. ^ PDB 2WTK; Zeqiraj E, Filippi BM, Deak M, Alessi DR, van Aalten DM (November 2009). "Structure of the LKB1-STRAD-MO25 Complex Reveals an Allosteric Mechanism of Kinase Activation". Science 326 (5960): 1707–11. doi:10.1126/science.1178377. PMC 3518268. PMID 19892943. 
  11. ^ a b Boudeau J, Deak M, Lawlor MA, Morrice NA, Alessi DR (2003). "Heat-shock protein 90 and Cdc37 interact with LKB1 and regulate its stability". Biochem. J. 370 (Pt 3): 849–57. doi:10.1042/BJ20021813. PMC 1223241. PMID 12489981. 
  12. ^ Yamada, Eijiro; Claire C. Bastie (February 2014). "Disruption of Fyn SH3 Domain Interaction with a Proline-Rich Motif in Liver Kinase B1 Results in Activation of AMP-Activated Protein Kinase.". PloS One (United States) 9 (2): e89604. doi:10.1371/journal.pone.0089604. 
  13. ^ Boudeau J, Scott JW, Resta N, Deak M, Kieloch A, Komander D, Hardie DG, Prescott AR, van Aalten DM, Alessi DR (2004). "Analysis of the LKB1-STRAD-MO25 complex". J. Cell. Sci. 117 (Pt 26): 6365–75. doi:10.1242/jcs.01571. PMID 15561763. 
  14. ^ Baas AF, Boudeau J, Sapkota GP, Smit L, Medema R, Morrice NA, Alessi DR, Clevers HC (2003). "Activation of the tumour suppressor kinase LKB1 by the STE20-like pseudokinase STRAD". EMBO J. 22 (12): 3062–72. doi:10.1093/emboj/cdg292. PMC 162144. PMID 12805220. 
  15. ^ Marignani PA, Kanai F, Carpenter CL (2001). "LKB1 associates with Brg1 and is necessary for Brg1-induced growth arrest". J. Biol. Chem. 276 (35): 32415–8. doi:10.1074/jbc.C100207200. PMID 11445556. 

Further reading[edit]

External links[edit]

This article incorporates text from the United States National Library of Medicine, which is in the public domain.