he development of novel and improved mass spectrometric and proteomic methods for the analysis of complex protein mixtures and the detailed characterization of proteins within these mixtures, including the analysis of post-translational protein modifications and the quantitation of protein abundances.
Development of instrument platforms for the detection and identification of disease-markers with special emphasis on pediatric diseases.
The use of mass spectrometry to identify mechanisms of cell cycle control during neurogenesis.
Development and applications of strategies to solve systems biological questions and problems at the proteome level. To achieve our goals we use proteomic and mass spectrometric technology in addition to biochemistry and molecular biology approaches, cell culture systems and animal models, including the mouse, the rat, and the African clawfrog.
Research Background
Judith Steen studied chemistry and biochemistry at the University of Toronto. She then studied mass spectrometry and cell biology under the mentorship of Peter Roepstorff (University of Southern Denmark) and Marc Kirschner (Harvard University), respectively.
Publications
Chemogenomic analysis reveals key role for lysine acetylation in regulating Arc stability. Nat Commun. 2017 11 21; 8(1):1659. View Abstract
Human iPSC-Derived Neuronal Model of Tau-A152T Frontotemporal Dementia Reveals Tau-Mediated Mechanisms of Neuronal Vulnerability. Stem Cell Reports. 2016 09 13; 7(3):325-340. View Abstract
FLEXITau: Quantifying Post-translational Modifications of Tau Protein in Vitro and in Human Disease. Anal Chem. 2016 Apr 05; 88(7):3704-14. View Abstract
Doublecortin-Like Kinases Promote Neuronal Survival and Induce Growth Cone Reformation via Distinct Mechanisms. Neuron. 2015 Nov 18; 88(4):704-19. View Abstract
Injury-induced decline of intrinsic regenerative ability revealed by quantitative proteomics. Neuron. 2015 May 20; 86(4):1000-1014. View Abstract
Quantitative comparison of a human cancer cell surface proteome between interphase and mitosis. EMBO J. 2015 Jan 13; 34(2):251-65. View Abstract
Quantitative profiling of peptides from RNAs classified as noncoding. Nat Commun. 2014 Nov 18; 5:5429. View Abstract
Basal activity of a PARP1-NuA4 complex varies dramatically across cancer cell lines. Cell Rep. 2014 Sep 25; 8(6):1808-1818. View Abstract
Co-regulation proteomics reveals substrates and mechanisms of APC/C-dependent degradation. EMBO J. 2014 Feb 18; 33(4):385-99. View Abstract
Nonparametric Bayesian evaluation of differential protein quantification. J Proteome Res. 2013 Oct 04; 12(10):4556-65. View Abstract
Diaminothiazoles modify Tau phosphorylation and improve the tauopathy in mouse models. J Biol Chem. 2013 Jul 26; 288(30):22042-56. View Abstract
Gas2l3, a novel constriction site-associated protein whose regulation is mediated by the APC/C Cdh1 complex. PLoS One. 2013; 8(2):e57532. View Abstract
SweetSEQer, simple de novo filtering and annotation of glycoconjugate mass spectra. Mol Cell Proteomics. 2013 Jun; 12(6):1735-40. View Abstract
A classifier based on accurate mass measurements to aid large scale, unbiased glycoproteomics. Mol Cell Proteomics. 2013 Apr; 12(4):1017-25. View Abstract
A non-parametric cutout index for robust evaluation of identified proteins. Mol Cell Proteomics. 2013 Mar; 12(3):807-12. View Abstract
FLEXIQinase, a mass spectrometry-based assay, to unveil multikinase mechanisms. Nat Methods. 2012 Apr 08; 9(5):504-8. View Abstract
Pleiotropic effects of miR-183~96~182 converge to regulate cell survival, proliferation and migration in medulloblastoma. Acta Neuropathol. 2012 Apr; 123(4):539-52. View Abstract
A practical guide to the FLEXIQuant method. Methods Mol Biol. 2012; 893:295-319. View Abstract
mz5: space- and time-efficient storage of mass spectrometry data sets. Mol Cell Proteomics. 2012 Jan; 11(1):O111.011379. View Abstract
A screen for regulators of survival of motor neuron protein levels. Nat Chem Biol. 2011 Jun 19; 7(8):544-52. View Abstract
Interaction of survival of motor neuron (SMN) and HuD proteins with mRNA cpg15 rescues motor neuron axonal deficits. Proc Natl Acad Sci U S A. 2011 Jun 21; 108(25):10337-42. View Abstract
libfbi: a C++ implementation for fast box intersection and application to sparse mass spectrometry data. Bioinformatics. 2011 Apr 15; 27(8):1166-7. View Abstract
Estimating the confidence of peptide identifications without decoy databases. Anal Chem. 2010 Jun 01; 82(11):4314-8. View Abstract
MGFp: an open Mascot Generic Format parser library implementation. J Proteome Res. 2010 May 07; 9(5):2762-3. View Abstract
Deuteration distribution estimation with improved sequence coverage for HX/MS experiments. Bioinformatics. 2010 Jun 15; 26(12):1535-41. View Abstract
When less can yield more - Computational preprocessing of MS/MS spectra for peptide identification. Proteomics. 2009 Nov; 9(21):4978-84. View Abstract
Computational protein profile similarity screening for quantitative mass spectrometry experiments. Bioinformatics. 2010 Jan 01; 26(1):77-83. View Abstract
The mechanism and pattern of yolk consumption provide insight into embryonic nutrition in Xenopus. Development. 2009 May; 136(9):1539-48. View Abstract
NITPICK: peak identification for mass spectrometry data. BMC Bioinformatics. 2008 Aug 28; 9:355. View Abstract
Different phosphorylation states of the anaphase promoting complex in response to antimitotic drugs: a quantitative proteomic analysis. Proc Natl Acad Sci U S A. 2008 Apr 22; 105(16):6069-74. View Abstract
Temporal variations of the postnatal rat urinary proteome as a reflection of systemic maturation. Proteomics. 2008 Mar; 8(5):1097-112. View Abstract
Brain-specific phosphorylation of MeCP2 regulates activity-dependent Bdnf transcription, dendritic growth, and spine maturation. Neuron. 2006 Oct 19; 52(2):255-69. View Abstract
Global methods for protein glycosylation analysis by mass spectrometry. Biochim Biophys Acta. 2006 Dec; 1764(12):1870-80. View Abstract
A new hybrid electrospray Fourier transform mass spectrometer: design and performance characteristics. Rapid Commun Mass Spectrom. 2006; 20(2):259-66. View Abstract
Characterization of a new qQq-FTICR mass spectrometer for post-translational modification analysis and top-down tandem mass spectrometry of whole proteins. J Am Soc Mass Spectrom. 2005 Dec; 16(12):1985-99. View Abstract
Phosphorylation analysis by mass spectrometry: myths, facts, and the consequences for qualitative and quantitative measurements. Mol Cell Proteomics. 2006 Jan; 5(1):172-81. View Abstract
Stable isotope-free relative and absolute quantitation of protein phosphorylation stoichiometry by MS. Proc Natl Acad Sci U S A. 2005 Mar 15; 102(11):3948-53. View Abstract
Using optimized collision energies and high resolution, high accuracy fragment ion selection to improve glycopeptide detection by precursor ion scanning. J Am Soc Mass Spectrom. 2003 Jul; 14(7):777-84. View Abstract
Tome-1, a trigger of mitotic entry, is degraded during G1 via the APC. Cell. 2003 Apr 04; 113(1):101-13. View Abstract
Toll and interleukin-1 receptor (TIR) domain-containing proteins in plants: a genomic perspective. Trends Plant Sci. 2002 Sep; 7(9):388-91. View Abstract
A rapid screening method to monitor expression of recombinant proteins from various prokaryotic and eukaryotic expression systems using matrix-assisted laser desorption ionization-time-of-flight mass spectrometry. Anal Biochem. 2002 Jun 15; 305(2):242-50. View Abstract
Association of carbonic anhydrase with a Calvin cycle enzyme complex in Nicotiana tabacum. Planta. 1998 Feb; 204(2):177-82. View Abstract