PIM1

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Pim-1 oncogene
Protein PIM1 PDB 1xqz.png
PDB rendering based on 1xqz.
Available structures
PDB Ortholog search: PDBe, RCSB
Identifiers
Symbols PIM1 ; PIM
External IDs OMIM164960 MGI97584 HomoloGene11214 ChEMBL: 2147 GeneCards: PIM1 Gene
EC number 2.7.11.1
RNA expression pattern
PBB GE PIM1 209193 at tn.png
More reference expression data
Orthologs
Species Human Mouse
Entrez 5292 18712
Ensembl ENSG00000137193 ENSMUSG00000024014
UniProt P11309 P06803
RefSeq (mRNA) NM_001243186 NM_008842
RefSeq (protein) NP_001230115 NP_032868
Location (UCSC) Chr 6:
37.14 – 37.14 Mb
Chr 17:
29.49 – 29.5 Mb
PubMed search [1] [2]

Proto-oncogene serine/threonine-protein kinase Pim-1 is an enzyme that in humans is encoded by the PIM1 gene.[1][2][3]

Pim-1 is a proto-oncogene which encodes for the serine/threonine kinase of the same name. The pim-1 oncogene was first described in relation to murine T-cell lymphomas, as it was the locus most frequently activated by the Moloney murine leukemia virus.[4] Subsequently, the oncogene has been implicated in multiple human cancers, including prostate cancer, acute myeloid leukemia and other hematopoietic malignancies.[5] Primarily expressed in spleen, thymus, bone marrow, prostate, oral epithelial, hippocampus and fetal liver cells, Pim-1 has also been found to be highly expressed in cell cultures isolated from human tumors.[4] Pim-1 is mainly involved in cell cycle progression, apoptosis and transcriptional activation, as well as more general signal transduction pathways.[4]

Gene[edit]

Located on chromosome 6 (6p21.2), the gene encompasses 5Kb of DNA, including 6 exons and 5 introns. Expression of Pim-1 has been shown to be regulated by the JAK/STAT pathway. Direct binding of transcription factors STAT3 and STAT5 to the pim-1 promoter results in the transcription of pim-1.[4] The pim-1 gene has been found to be conserved in dogs, cows, mice, rats, zebrafish and C. elegans. Pim-1 deficient mice have been shown to be phenotypically normal, indicating that there is redundancy in the function of this kinase.[4] In fact, sequence homology searches have shown that two other Pim-1-like kinases, Pim-2 and Pim-3, are structurally and functionally similar.[4] Interestingly, the pim-1 gene encodes has multiple translation initiation sites, resulting in two proteins of 34 and 44kD.[4]

Protein structure[edit]

Human, murine and rat pim-1 contain 313 amino acids, and have a 94 – 97% amino acid identity.[4] The active site of the protein, ranging from amino acids 38-290, is composed of several conserved motifs, including a glycine loop motif, a phosphate binding site and a proton acceptor site.[4] Modification of the protein at amino acid 67 (lysine to methionine) results in the inactivation of the kinase.[4]

Activation and stabilization[edit]

Pim-1 is primarily involved in cytokine signaling, and has been implicated in many signal transduction pathways. Because Pim-1 translation is initiated by STAT3 and STAT5, its production is regulated by the cytokines that regulate the STAT pathway, or STAT factors. These include interleukins (IL-2, IL-3,IL-5, IL-6, IL-7, IL12, IL-15), prolactin, TNFα, EGF and IFNγ, among others.[4] Interestingly, Pim-1 itself can bind to negative regulators of the JAK/STAT pathway, resulting in a negative feedback loop.

Although little is known about the post-transcriptional modifications of Pim-1, it has been hypothesized that Hsp90 is responsible for the folding and stabilization of Pim-1, although the exact mechanism has yet to be discovered.[4] Furthermore, the serine/threonine phosphatase PP2 has been shown to degrade Pim-1.

Interactions[edit]

PIM1 has been shown to interact with:

Other known substrates/binding partners of Pim-1 include proteins involved in transcription regulation (nuclear adaptor protein p100, HP-1, PAP-1 and TRAF2 / SNX6), and regulation of the JAK/STAT pathway (SOCS1 and SOCS3).[4] Furthermore, Pim-1 has been shown to be a cofactor for c-Myc, a transcription factor believed to regulate 15% of all genes, and their synergy has been in prostate tumorigenesis.[14]

Pim-1 is able to phosphorylate many targets, including itself. Many of its targets are involved in cell cycle regulation.

Activates[edit]

  • Cdc25C (G1/S positive regulator): Activation results in increased G1S[4]
  • Cdc25C (G2/M positive regulator): Activation results in increased G2M[4]

Deactivates[edit]

  • Bad (Pro-apoptotic protein): Deactivation results in increased cell survival[4]
  • CKI (G1/S negative regulator): Deactivation results in increased G1 → S[4]
  • C-TAK1 (Cdc25C inhibitor): Deactivation results in increased G2 → M[4]

Clinical implications[edit]

Pim-1 is directly involved in the regulation of cell cycle progression and apoptosis, and has been implicated in numerous cancers including prostate cancer, Burkitt’s lymphoma and oral cancer, as well as numerous hematopoietic lymphomas. Single nucleotide polymorphisms in the Pim-1 gene have been associated with increased risk for lung cancer in Korean patients, and have also been found in diffuse large cell lymphomas.[15]

References[edit]

  1. ^ "Entrez Gene: PIM1 pim-1 oncogene". 
  2. ^ Domen J, Von Lindern M, Hermans A, Breuer M, Grosveld G, Berns A (June 1987). "Comparison of the human and mouse PIM-1 cDNAs: nucleotide sequence and immunological identification of the in vitro synthesized PIM-1 protein". Oncogene Res. 1 (1): 103–12. PMID 3329709. 
  3. ^ Meeker TC, Nagarajan L, ar-Rushdi A, Rovera G, Huebner K, Croce CM (June 1987). "Characterization of the human PIM-1 gene: a putative proto-oncogene coding for a tissue specific member of the protein kinase family". Oncogene Res. 1 (1): 87–101. PMID 3329711. 
  4. ^ a b c d e f g h i j k l m n o p q r Bachmann M, Möröy T (April 2005). "The serine/threonine kinase Pim-1". Int. J. Biochem. Cell Biol. 37 (4): 726–30. doi:10.1016/j.biocel.2004.11.005. PMID 15694833. 
  5. ^ "Pim-1 Oncogene". Retrieved 2010-05-24. [dead link]
  6. ^ Koike N, Maita H, Taira T, Ariga H, Iguchi-Ariga SM (February 2000). "Identification of heterochromatin protein 1 (HP1) as a phosphorylation target by Pim-1 kinase and the effect of phosphorylation on the transcriptional repression function of HP1(1)". FEBS Lett. 467 (1): 17–21. doi:10.1016/S0014-5793(00)01105-4. PMID 10664448. 
  7. ^ Mochizuki T, Kitanaka C, Noguchi K, Muramatsu T, Asai A, Kuchino Y (June 1999). "Physical and functional interactions between Pim-1 kinase and Cdc25A phosphatase. Implications for the Pim-1-mediated activation of the c-Myc signaling pathway". J. Biol. Chem. 274 (26): 18659–66. doi:10.1074/jbc.274.26.18659. PMID 10373478. 
  8. ^ Mizuno K, Shirogane T, Shinohara A, Iwamatsu A, Hibi M, Hirano T (March 2001). "Regulation of Pim-1 by Hsp90". Biochem. Biophys. Res. Commun. 281 (3): 663–9. doi:10.1006/bbrc.2001.4405. PMID 11237709. 
  9. ^ Rainio EM, Sandholm J, Koskinen PJ (February 2002). "Cutting edge: Transcriptional activity of NFATc1 is enhanced by the Pim-1 kinase". J. Immunol. 168 (4): 1524–7. doi:10.4049/jimmunol.168.4.1524. PMID 11823475. 
  10. ^ Bhattacharya N, Wang Z, Davitt C, McKenzie IF, Xing PX, Magnuson NS (July 2002). "Pim-1 associates with protein complexes necessary for mitosis". Chromosoma 111 (2): 80–95. doi:10.1007/s00412-002-0192-6. PMID 12111331. 
  11. ^ Wang Z, Bhattacharya N, Mixter PF, Wei W, Sedivy J, Magnuson NS (December 2002). "Phosphorylation of the cell cycle inhibitor p21Cip1/WAF1 by Pim-1 kinase". Biochim. Biophys. Acta 1593 (1): 45–55. doi:10.1016/S0167-4889(02)00347-6. PMID 12431783. 
  12. ^ Leverson JD, Koskinen PJ, Orrico FC, Rainio EM, Jalkanen KJ, Dash AB, Eisenman RN, Ness SA (October 1998). "Pim-1 kinase and p100 cooperate to enhance c-Myb activity". Mol. Cell 2 (4): 417–25. doi:10.1016/S1097-2765(00)80141-0. PMID 9809063. 
  13. ^ Nihira K, Ando Y, Yamaguchi T, Kagami Y, Miki Y, Yoshida K (April 2010). "Pim-1 controls NF-κB signalling by stabilizing RelA/p65". Cell Death Differ, 17 (4): 689–98. doi:10.1038/cdd.2009.174. PMID 19911008. 
  14. ^ Wang J, Kim J, Roh M, Franco OE, Hayward SW, Wills ML, Abdulkadir SA (April 2010). "Pim1 kinase synergizes with c-MYC to induce advanced prostate carcinoma". Oncogene 29 (17): 2477–87. doi:10.1038/onc.2010.10. PMC 2861731. PMID 20140016. 
  15. ^ Kim DS, Sung JS, Shin ES, Ryu JS, Choi IK, Park KH, Park Y, Kim EB, Park SJ, Kim YH (December 2008). "Association of Single Nucleotide Polymorphisms in PIM-1 Gene with the Risk of Korean Lung Cancer". Cancer Res Treat 40 (4): 190–6. doi:10.4143/crt.2008.40.4.190. PMC 2697471. PMID 19688129. 

Further reading[edit]