Huang H.,University of Chicago |
Suslov N.B.,University of Chicago |
Suslov N.B.,Takeda California |
Li N.-S.,University of Chicago |
And 5 more authors.
Nature Chemical Biology | Year: 2014
Spinach is an in vitro-selected RNA aptamer that binds a GFP-like ligand and activates its green fluorescence. Spinach is thus an RNA analog of GFP and has potentially widespread applications for in vivo labeling and imaging. We used antibody-assisted crystallography to determine the structures of Spinach both with and without bound fluorophore at 2.2-Å and 2.4-Å resolution, respectively. Spinach RNA has an elongated structure containing two helical domains separated by an internal bulge that folds into a G-quadruplex motif of unusual topology. The G-quadruplex motif and adjacent nucleotides comprise a partially preformed binding site for the fluorophore. The fluorophore binds in a planar conformation and makes extensive aromatic stacking and hydrogen bond interactions with the RNA. Our findings provide a foundation for structure-based engineering of new fluorophore-binding RNA aptamers. © 2014 Nature America, Inc. All rights reserved. Source
Miyahisa I.,Takeda Pharmaceutical |
Sameshima T.,Takeda Pharmaceutical |
Hixon M.S.,Takeda California
Angewandte Chemie - International Edition | Year: 2015
Owing to their covalent target occupancy, irreversible inhibitors require low exposures and offer long duration, and their use thus represents a powerful strategy for achieving pharmacological efficacy. Importantly, the potency metric of irreversible inhibitors is kinact/KI not IC50. A simple approach to measuring kinact/KI was developed that makes use of an irreversible probe for competitive assays run to completion against test compounds. In this system, the kinact/KI value of the test compound is equal to (kinact/KI)probe×[probe]/IC50. The advantages of this method include simplicity, high throughput, and application to all target classes, and it only requires an in-depth kinetic evaluation of the probe. © 2015 Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim. Source
Chan W.K.,St Jude Childrens Research Hospital |
Sutherland M.K.,Seattle Genetics |
Li Y.,St Jude Childrens Research Hospital |
Zalevsky J.,Xencor |
And 4 more authors.
Clinical Cancer Research | Year: 2012
Purpose: Leukemias with MLL gene rearrangement are associated with a poor prognosis. Natural killer (NK) cell therapy is a potential treatment, but leukemia cells may be resistant. Here, we sought to determine the susceptibility of MLL-rearranged leukemia cells to NK cell lysis and to develop a novel immunotherapeutic approach to optimize NK cell therapy, including the use of an antibody against leukemia-associated antigen and the elimination of killer-cell immunoglobulin-like receptor (KIR)-mediated inhibition. Experimental Design: Three MLL-rearranged leukemia cell lines (RS4;11, SEM, and MV4-11) and primary leukemia blasts were assessed for surface phenotype and susceptibility to NK cell lysis with or without antibodies against CD19 (XmAb5574), CD33 (lintuzumab), or KIR ligands. Results: All three cell lines were resistant to NK cell lysis, had some inhibitory KIR ligands and protease inhibitor-9, and expressed low levels of NKG2D activating ligands and adhesion molecules. After treatment with XmAb5574 or lintuzumab, MLL-rearranged leukemia cells were efficiently killed by NK cells. The addition of pan-major histocompatibility complex class I antibody, which blocked inhibitory KIR-HLA interaction, further augmented degranulation in all three KIR2DL1, KIR2DL2/3, and KIR3DL1 subsets of NK cells based on the rule of missing-self recognition. A mouse model showed a decreased rate of leukemia progression in vivo as monitored by bioluminescence imaging and longer survival after antibody treatment. Conclusion: Our data support the use of a triple immunotherapy approach, including an antibody directed against tumor-associated antigen, KIR-mismatched NK cell transplantation, and inhibitory KIR blockade, for the treatment of NK cell-resistant MLL -rearranged leukemias. ©2012 AACR. Source
Takeda California | Date: 2013-10-02
Compounds are provided for use with glucokinase that comprise the formula: wherein the variables are as defined herein. Also provided are pharmaceutical compositions, kits and articles of manufacture comprising such compounds; methods and intermediates useful for making the compounds; and methods of using said compounds.
Takeda California | Date: 2011-03-04
A process for the production of fluorinated compound represented by the formula (I): or salts thereof wherein R