title: Quantitative proteomics reveals novel protein interaction partners of PP2A catalytic subunit in pancreatic β-cells.
abstract: Protein phosphatase 2A (PP2A) is one of the major serine/threonine phosphatases. We hypothesize that PP2A regulates signaling cascades in pancreatic β-cells in the context of glucose-stimulated insulin secretion (GSIS). Using co-immunoprecipitation (co-IP) and tandem mass spectrometry, we globally identified the protein interaction partners of the PP2A catalytic subunit (PP2Ac) in insulin-secreting pancreatic β-cells. Among the 514 identified PP2Ac interaction partners, 476 were novel. This represents the first global view of PP2Ac protein-protein interactions caused by hyperglycemic conditions. Additionally, numerous PP2Ac partners were found involved in a variety of signaling pathways in the β-cell function, such as insulin secretion. Our data suggest that PP2A interacts with various signaling proteins necessary for physiological insulin secretion as well as signaling proteins known to regulate cell dysfunction and apoptosis in the pancreatic β-cells.
authors.affiliation: Department of Pharmaceutical Sciences, Eugene Applebaum College of Pharmacy and Health Sciences, Wayne State University, Detroit, MI, 48201, USA.
authors.forename: Xiangmin
authors.initials: X
authors.lastname: Zhang
authors.affiliation: Department of Pharmaceutical Sciences, Eugene Applebaum College of Pharmacy and Health Sciences, Wayne State University, Detroit, MI, 48201, USA.
authors.forename: Divyasri
authors.initials: D
authors.lastname: Damacharla
authors.affiliation: Department of Pharmaceutical Sciences, Eugene Applebaum College of Pharmacy and Health Sciences, Wayne State University, Detroit, MI, 48201, USA.
authors.forename: Danjun
authors.initials: D
authors.lastname: Ma
authors.affiliation: Department of Pharmaceutical Sciences, Eugene Applebaum College of Pharmacy and Health Sciences, Wayne State University, Detroit, MI, 48201, USA.
authors.forename: Yue
authors.initials: Y
authors.lastname: Qi
authors.affiliation: Department of Computer Science, College of Engineering, Wayne State University, Detroit, MI, USA.
authors.forename: Rebecca
authors.initials: R
authors.lastname: Tagett
authors.affiliation: Department of Computer Science, College of Engineering, Wayne State University, Detroit, MI, USA.
authors.forename: Sorin
authors.initials: S
authors.lastname: Draghici
authors.affiliation: Department of Pharmaceutical Sciences, Eugene Applebaum College of Pharmacy and Health Sciences, Wayne State University, Detroit, MI, 48201, USA; β-Cell Biochemistry Laboratory, John D. Dingell VA Medical Center, Detroit, MI, 48201, USA.
authors.forename: Anjaneyulu
authors.initials: A
authors.lastname: Kowluru
authors.affiliation: Department of Pharmaceutical Sciences, Eugene Applebaum College of Pharmacy and Health Sciences, Wayne State University, Detroit, MI, 48201, USA. Electronic address: zhengping.yi@wayne.edu.
authors.forename: Zhengping
authors.initials: Z
authors.lastname: Yi
mesh_terms: D002478:Cells, Cultured; D053263:Gene Regulatory Networks; D005947:Glucose / Q000494:pharmacology; D006801:Humans; D050417:Insulin-Secreting Cells / Q000502:physiology*; D025941:Protein Interaction Mapping / Q000379:methods; D054648:Protein Phosphatase 2 / Q000378:metabolism*; D040901:Proteomics / Q000379:methods*; D053719:Tandem Mass Spectrometry
chemical_list: D054648:Protein Phosphatase 2; D005947:Glucose
keywords: Glucotoxic condition; Interaction partner; Pancreatic β-cell; Quantitative proteomics; Serine/threonine protein phosphatase 2A (PP2A)