title: Pim-1 ligand-bound structures reveal the mechanism of serine/threonine kinase inhibition by LY294002.
abstract: Pim-1 is an oncogene-encoded serine/threonine kinase primarily expressed in hematopoietic and germ cell lines. Pim-1 kinase was originally identified in Maloney murine leukemia virus-induced T-cell lymphomas and is associated with multiple cellular functions such as proliferation, survival, differentiation, apoptosis, and tumorigenesis (Wang, Z., Bhattacharya, N., Weaver, M., Petersen, K., Meyer, M., Gapter, L., and Magnuson, N. S. (2001) J. Vet. Sci. 2, 167-179). The crystal structures of Pim-1 complexed with staurosporine and adenosine were determined. Although a typical two-domain serine/threonine protein kinase fold is observed, the inter-domain hinge region is unusual in both sequence and conformation; a two-residue insertion causes the hinge to bulge away from the ATP-binding pocket, and a proline residue in the hinge removes a conserved main chain hydrogen bond donor. Without this hydrogen bond, van der Waals interactions with the hinge serve to position the ligand. The hinge region of Pim-1 resembles that of phosphatidylinositol 3-kinase more closely than it does other protein kinases. Although the phosphatidylinositol 3-kinase inhibitor LY294002 also inhibits Pim-1, the structure of the LY294002.Pim-1 complex reveals a new binding mode that may be general for Ser/Thr kinases.
authors.affiliation: Vertex Pharmaceuticals Incorporated, Cambridge, Massachusetts 02139, USA. marc_jacobs@vrtx.com
authors.forename: Marc D
authors.initials: MD
authors.lastname: Jacobs
authors.forename: James
authors.initials: J
authors.lastname: Black
authors.forename: Olga
authors.initials: O
authors.lastname: Futer
authors.forename: Lora
authors.initials: L
authors.lastname: Swenson
authors.forename: Brian
authors.initials: B
authors.lastname: Hare
authors.forename: Mark
authors.initials: M
authors.lastname: Fleming
authors.forename: Kumkum
authors.initials: K
authors.lastname: Saxena
mesh_terms: D000241:Adenosine / Q000737:chemistry / Q000378:metabolism; D000595:Amino Acid Sequence; D001665:Binding Sites; D002867:Chromones / Q000737:chemistry / Q000378:metabolism*; D017868:Cyclic AMP-Dependent Protein Kinases / Q000737:chemistry / Q000235:genetics; D004791:Enzyme Inhibitors / Q000737:chemistry / Q000378:metabolism*; D006801:Humans; D006860:Hydrogen Bonding; D008024:Ligands; D008958:Models, Molecular; D008969:Molecular Sequence Data; D015394:Molecular Structure; D009025:Morpholines / Q000737:chemistry / Q000378:metabolism*; D019869:Phosphatidylinositol 3-Kinases / Q000737:chemistry / Q000235:genetics; D011485:Protein Binding; D011487:Protein Conformation; D017346:Protein Serine-Threonine Kinases / Q000037:antagonists & inhibitors / Q000737:chemistry* / Q000235:genetics / Q000378:metabolism*; D011518:Proto-Oncogene Proteins / Q000037:antagonists & inhibitors / Q000737:chemistry* / Q000235:genetics / Q000378:metabolism*; D051573:Proto-Oncogene Proteins c-pim-1; D016415:Sequence Alignment; D019311:Staurosporine / Q000737:chemistry / Q000378:metabolism
chemical_list: D000241:Adenosine; D002867:Chromones; D017868:Cyclic AMP-Dependent Protein Kinases; D004791:Enzyme Inhibitors; D008024:Ligands; D009025:Morpholines; D019869:Phosphatidylinositol 3-Kinases; D017346:Protein Serine-Threonine Kinases; D011518:Proto-Oncogene Proteins; D051573:Proto-Oncogene Proteins c-pim-1; D019311:Staurosporine; C085911:2-(4-morpholinyl)-8-phenyl-4H-1-benzopyran-4-one; C496634:PIM1 protein, human