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Title: Uncovering the Role of Sgf73 in Maintaining SAGA Deubiquitinating Module Structure and Activity

Journal Article · · Journal of Molecular Biology
 [1];  [1]
  1. Johns Hopkins Univ., Baltimore, MD (United States). School of Medicine, Dept. of Biophysics and Biophysical Chemistry

The SAGA (Spt-Ada-Gcn5-acetyltransferase) complex performs multiple functions in transcription activation including deubiquitinating histone H2B, which is mediated by a subcomplex called the deubiquitinating module (DUBm). The yeast DUBm comprises a catalytic subunit, Ubp8, and three additional subunits, Sgf11, Sus1 and Sgf73, all of which are required for DUBm activity. A portion of the non-globular Sgf73 subunit lies between the Ubp8 catalytic domain and the ZnF-UBP domain and has been proposed to contribute to deubiquitinating activity by maintaining the catalytic domain in an active conformation. We report structural and solution studies of the DUBm containing two different Sgf73 point mutations that disrupt deubiquitinating activity. We find that the Sgf73 mutations abrogate deubiquitinating activity by impacting the Ubp8 ubiquitin-binding fingers region and have an unexpected effect on the overall folding and stability of the DUBm complex. Finally, taken together, our data suggest a role for Sgf73 in maintaining both the organization and ubiquitin-binding conformation of Ubp8, thereby contributing to overall DUBm activity.

Research Organization:
Argonne National Lab. (ANL), Argonne, IL (United States). Advanced Photon Source (APS)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
Grant/Contract Number:
AC02-06CH11357
OSTI ID:
1212204
Journal Information:
Journal of Molecular Biology, Journal Name: Journal of Molecular Biology Journal Issue: 8 Vol. 427; ISSN 0022-2836
Publisher:
ElsevierCopyright Statement
Country of Publication:
United States
Language:
ENGLISH

References (46)

The Combined Use of the Thermofluor Assay and ThermoQ Analytical Software for the Determination of Protein Stability and Buffer Optimization as an Aid in Protein Crystallization journal April 2011
Aberrant expression of USP22 is associated with liver metastasis and poor prognosis of colorectal cancer: Aberrant Expression of USP22 in Colorectal Cancer journal December 2010
Mechanisms for regulating deubiquitinating enzymes: Mechanisms for Regulating DUBs journal February 2014
Ubiquitin-specific protease 22: a novel molecular biomarker in cervical cancer prognosis and therapeutics journal August 2013
Crystal Structure of a UBP-Family Deubiquitinating Enzyme in Isolation and in Complex with Ubiquitin Aldehyde journal December 2002
Multiple Associated Proteins Regulate Proteasome Structure and Function journal September 2002
A Conserved RING Finger Protein Required for Histone H2B Monoubiquitination and Cell Size Control journal January 2003
Multiple faces of the SAGA complex journal June 2010
Histone Crosstalk between H2B Monoubiquitination and H3 Methylation Mediated by COMPASS journal December 2007
Structural Basis for Assembly and Activation of the Heterotetrameric SAGA Histone H2B Deubiquitinase Module journal May 2010
Molecular Regulation of Histone H3 Trimethylation by COMPASS and the Regulation of Gene Expression journal September 2005
A UAF1-Containing Multisubunit Protein Complex Regulates the Fanconi Anemia Pathway journal December 2007
A TFTC/STAGA Module Mediates Histone H2A and H2B Deubiquitination, Coactivates Nuclear Receptors, and Counteracts Heterochromatin Silencing journal January 2008
The Putative Cancer Stem Cell Marker USP22 Is a Subunit of the Human SAGA Complex Required for Activated Transcription and Cell-Cycle Progression journal January 2008
Mechanism of USP7/HAUSP Activation by Its C-Terminal Ubiquitin-like Domain and Allosteric Regulation by GMP-Synthetase journal October 2011
Multi-tasking on chromatin with the SAGA coactivator complexes journal May 2007
A Role for Intersubunit Interactions in Maintaining SAGA Deubiquitinating Module Structure and Activity journal August 2012
Kinetic and Mechanistic Studies on the Hydrolysis of Ubiquitin C-Terminal 7-Amido-4-Methylcoumarin by Deubiquitinating Enzymes journal January 1998
Polyubiquitin Binding and Disassembly By Deubiquitinating Enzymes journal April 2009
Insights into SAGA function during gene expression journal July 2009
Combinatorial depletion analysis to assemble the network architecture of the SAGA and ADA chromatin remodeling complexes journal January 2011
Histone H2A deubiquitinase activity of the Polycomb repressive complex PR-DUB journal May 2010
Proteasome recruitment and activation of the Uch37 deubiquitinating enzyme by Adrm1 journal August 2006
Yeast Ataxin-7 links histone deubiquitination with gene gating and mRNA export journal May 2008
Inducible gene expression: diverse regulatory mechanisms journal April 2010
Breaking the chains: structure and function of the deubiquitinases journal August 2009
Dissection of USP catalytic domains reveals five common insertion points journal January 2009
Protein partners of deubiquitinating enzymes journal August 2008
Deubiquitination of Histone H2B by a Yeast Acetyltransferase Complex Regulates Transcription journal January 2004
WDR20 Regulates Activity of the USP12·UAF1 Deubiquitinating Enzyme Complex journal April 2010
Amino-terminal Dimerization, NRDP1-Rhodanese Interaction, and Inhibited Catalytic Domain Conformation of the Ubiquitin-specific Protease 8 (USP8) journal October 2006
UAF1 Is a Subunit of Multiple Deubiquitinating Enzyme Complexes journal February 2009
The mRNA Export Factor Sus1 Is Involved in Spt/Ada/Gcn5 Acetyltransferase-mediated H2B Deubiquitinylation through Its Interaction with Ubp8 and Sgf11 journal October 2006
The tumor suppressor CDC73 interacts with the ring finger proteins RNF20 and RNF40 and is required for the maintenance of histone 2B monoubiquitination journal October 2011
Transcriptional activation via sequential histone H2B ubiquitylation and deubiquitylation, mediated by SAGA-associated Ubp8 journal October 2003
PHENIX : building new software for automated crystallographic structure determination journal October 2002
Features and development of Coot journal March 2010
Refinement of Macromolecular Structures by the Maximum-Likelihood Method journal May 1997
Role of Rpn11 Metalloprotease in Deubiquitination and Degradation by the 26S Proteasome journal August 2002
Structural Insights into the Assembly and Function of the SAGA Deubiquitinating Module journal April 2010
Rad6-Dependent Ubiquitination of Histone H2B in Yeast journal January 2000
The Tightly Controlled Deubiquitination Activity of the Human SAGA Complex Differentially Modifies Distinct Gene Regulatory Elements journal September 2011
The Deubiquitylation Activity of Ubp8 Is Dependent upon Sgf11 and Its Association with the SAGA Complex journal January 2005
Estrogen-Dependent Gene Transcription in Human Breast Cancer Cells Relies upon Proteasome-Dependent Monoubiquitination of Histone H2B journal August 2011
Yeast Sgf73/Ataxin-7 serves to anchor the deubiquitination module into both SAGA and Slik(SALSA) HAT complexes journal January 2009
USP22, an hSAGA subunit and potential cancer stem cell marker, reverses the polycomb-catalyzed ubiquitylation of histone H2A journal June 2008

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