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Institute for Systems Biology

NonprofitSeattle, Washington, United States
About: Institute for Systems Biology is a nonprofit organization based out in Seattle, Washington, United States. It is known for research contribution in the topics: Population & Proteomics. The organization has 1277 authors who have published 2777 publications receiving 353165 citations.


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Journal ArticleDOI
01 Mar 2011-Mbio
TL;DR: The time is at hand to redefine the pathogen-host research paradigm, because the first decade of the twenty-first century has seen remarkable innovations in technology and computational methods.
Abstract: The twentieth century was marked by extraordinary advances in our understanding of microbes and infectious disease, but pandemics remain, food and waterborne illnesses are frequent, multidrug-resistant microbes are on the rise, and the needed drugs and vaccines have not been developed. The scientific approaches of the past-including the intense focus on individual genes and proteins typical of molecular biology-have not been sufficient to address these challenges. The first decade of the twenty-first century has seen remarkable innovations in technology and computational methods. These new tools provide nearly comprehensive views of complex biological systems and can provide a correspondingly deeper understanding of pathogen-host interactions. To take full advantage of these innovations, the National Institute of Allergy and Infectious Diseases recently initiated the Systems Biology Program for Infectious Disease Research. As participants of the Systems Biology Program, we think that the time is at hand to redefine the pathogen-host research paradigm.

113 citations

Journal ArticleDOI
TL;DR: Experimental evidence is provided for how archaea likely accomplish similar large-scale transcriptional segregation and modulation of physiological functions and provides an example for how to use various experimental techniques to rapidly learn significant portions of a global gene regulatory network of organisms for which little has been previously known.
Abstract: Cells responding to dramatic environmental changes or undergoing a developmental switch typically change the expression of numerous genes. In bacteria, σ factors regulate much of this process, whereas in eukaryotes, four RNA polymerases and a multiplicity of generalized transcription factors (GTFs) are required. Here, by using a systems approach, we provide experimental evidence (including protein-coimmunoprecipitation, ChIP-Chip, GTF perturbation and knockout, and measurement of transcriptional changes in these genetically perturbed strains) for how archaea likely accomplish similar large-scale transcriptional segregation and modulation of physiological functions. We are able to associate GTFs to nearly half of all putative promoters and show evidence for at least 7 of the possible 42 functional GTF pairs. This report represents a significant contribution toward closing the gap in our understanding of gene regulation by GTFs for all three domains of life and provides an example for how to use various experimental techniques to rapidly learn significant portions of a global gene regulatory network of organisms for which little has been previously known.

113 citations

Journal ArticleDOI
TL;DR: Results indicate that these four proteins are components of the RNA editing complex and that Tb MP63 and TbMP52 can interact.
Abstract: RNA editing in kinetoplastid mitochondria occurs by a series of enzymatic steps that is catalyzed by a macromolecular complex. Four novel proteins and their corresponding genes were identified by mass spectrometric analysis of purified editing complexes from Trypanosoma brucei. These four proteins, TbMP81, TbMP63, TbMP42, and TbMP18, contain conserved sequences to various degrees. All four proteins have sequence similarity in the C terminus; TbMP18 has considerable sequence similarity to the C-terminal region of TbMP42, and TbMP81, TbMP63, and TbMP42 contain zinc finger motif(s). Monoclonal antibodies that are specific for TbMP63 and TbMP42 immunoprecipitate in vitro RNA editing activities. The proteins are present in the immunoprecipitates and sediment at 20S along with the in vitro editing, and RNA editing ligases TbMP52 and TbMP48. Recombinant TbMP63 and TbMP52 coimmunoprecipitate. These results indicate that these four proteins are components of the RNA editing complex and that TbMP63 and TbMP52 can interact. RNA editing in trypanosomes posttranscriptionally inserts and deletes uridylates (U’s) at multiple sites in most mitochondrial pre-mRNAs to produce mature mRNAs. U insertion and deletion are directed by guide RNAs (gRNAs) and are catalyzed by a macromolecular complex. Editing occurs by a series of enzymatic steps that include endoribonuclease, 3 terminal uridylyl transferase (TUTase), 3 exouridylylase, and RNA ligase activities (reviewed in references 3, 8, 21, and 23). Although editing can be extensive, with the insertion and deletion of numerous U’s, it is also very specific. The characteristics of the enzymatic activities contribute to this specificity (7), but noncatalytic proteins may be required for editing and may contribute to the specificity. RNA editing is catalyzed by a 20S ribonucleoprotein complex (2, 15), and identification of its components and the composition of the fully functional complex is at an early stage. Initial studies estimated that a complex that can catalyze at least some of the steps of editing in vitro contains 7 to 20 polypeptides (11, 14, 16). Two related proteins, TbMP52 and TbMP48, were identified by mass spectrometric analysis of purified editing complexes (14), and TbMP52 was shown to be essential for RNA editing and for survival of bloodstream forms in vivo and in vitro (19). In addition, TbMP52 and TbMP48 correspond to the larger and smaller adenylatable proteins in the RNA editing complex, respectively, and were found to be RNA ligases (12, 17, 19). TbMP52 corresponds to T. brucei V and T. brucei p52 and TbMP48 corresponds to T. brucei IV and T. brucei p48 (12, 17). The fully functional editing complex, which may consist of a catalytic core complex and accessory and regulatory factors may contain numerous proteins. Several other candidate proteins, some of which have RNA binding activities, have been described and may play a role in RNA editing (6, 9, 11, 13, 25). However, except for mHel61p (13), none of these proteins have been shown to play a direct role in editing. In this study, we describe the identification of four additional proteins that are present in the RNA editing complex by immunoprecipitation, mass spectrometric, and/or gradient sedimentation analyses. These four proteins have sequence similarities to each other and the three largest contain one or two C2H2 zinc finger motif(s). One protein was also shown to interact in vitro with the TbMP52 editing RNA ligase.

113 citations

Journal ArticleDOI
TL;DR: This report summarizes the efforts to comprehensively characterize the human CSF proteome to date by utilizing several different separation methodologies and mass spectrometric platforms that greatly enhanced the identification coverage and the depth of protein profiling of CSF to characterize CSFroteome.
Abstract: Human cerebrospinal fluid (CSF) is an important source for studying protein biomarkers of age-related neurodegenerative diseases. Before characterizing biomarkers unique to each disease, it is necessary to categorize CSF proteins systematically and extensively. However, the enormous complexity, great dynamic range of protein concentrations, and tremendous protein heterogeneity due to post-translational modification of CSF create significant challenges to the existing proteomics technologies for an in-depth, nonbiased profiling of the human CSF proteome. To circumvent these difficulties, in the last few years, we have utilized several different separation methodologies and mass spectrometric platforms that greatly enhanced the identification coverage and the depth of protein profiling of CSF to characterize CSF proteome. In total, 2594 proteins were identified in well-characterized pooled human CSF samples using stringent proteomics criteria. This report summarizes our efforts to comprehensively characterize the human CSF proteome to date.

113 citations

Journal ArticleDOI
TL;DR: Proteomic analysis of urine from patients with prostate cancer identified CD90; conversely, CD90 was not detected in the urine of post-prostatectomy patients, and this urinary CD90 protein was a variant CD90protein not known to be expressed by such cells as lymphocytes that express CD90.

113 citations


Authors

Showing all 1292 results

NameH-indexPapersCitations
Younan Xia216943175757
Ruedi Aebersold182879141881
David Haussler172488224960
Steven P. Gygi172704129173
Nahum Sonenberg167647104053
Leroy Hood158853128452
Mark H. Ellisman11763755289
Wei Zhang112118993641
John Ralph10944239238
Eric H. Davidson10645447058
James R. Heath10342558548
Alan Aderem9924646682
Anne-Claude Gingras9733640714
Trey Ideker9730672276
Michael H. Gelb9450634714
Performance
Metrics
No. of papers from the Institution in previous years
YearPapers
20233
202260
2021216
2020204
2019188
2018168