NDLI: Large-Scale Protein Identification in Intracellular Aquaporin-2 Vesicles from Renal Inner Medullary Collecting Duct

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Large-Scale Protein Identification in Intracellular Aquaporin-2 Vesicles from Renal Inner Medullary Collecting Duct

Content Provider	PubMed Central
Author	Barile, Maria Pisitkun, Trairak Yu, Ming-jiun Chou, Chung-lin Verbalis, Michael J. Shen, Rong-fong Knepper, Mark A.
Abstract	Vasopressin acts on renal collecting duct cells to stimulate translocation of aquaporin-2(AQP2)-containing membrane vesicles from throughout the cytoplasm to the apical region. The vesicles fuse with the plasma membrane to increase water permeability. To identify the intracellular membrane compartments that contain AQP2, we carried out LC-MS/MS-based proteomic analysis of immunoisolated AQP2-containing intracellular vesicles from rat IMCD. Immuno-gold EM and immunoblotting confirmed heavy AQP2 labeling of immunoisolated vesicles. Vesicle proteins were separated by SDS-PAGE, followed by in-gel trypsin digestion in consecutive gel slices and identification by LC-MS/MS. Identification of Rab GTPases 4, 5, 18, and 21 (associated with early endosomes), Rab7 (late endosomes), and Rab11 and Rab25 (recycling endosomes) indicate that a substantial fraction of intracellular AQP2 is present in endosomal compartments. In addition, several endosome-associated SNARE proteins were identified including syntaxin-7, syntaxin-12, syntaxin-13, Vti1a, VAMP2, and VAMP3. Rab3 was not found, however, either by mass spectrometry or immunoblotting, suggesting a relative lack of AQP2 in secretory vesicles. Additionally, we identified markers of the trans-Golgi network (TGN), components of the exocyst complex, and several motor proteins including myosin IC, non-muscle myosin IIA&B, myosin VI, and myosin IXB. Beyond this, identification of multiple ER-resident proteins and ribosomal proteins indicated that a substantial fraction of intracellular AQP2 is present in rough endoplasmic reticulum (RER). These results show that AQP2-containing vesicles are heterogeneous and that intracellular AQP2 resides chiefly in endosomes, TGN, and RER.
Related Links	http://dx.doi.org/10.1074/mcp.m500049-mcp200
Ending Page	1106
Page Count	12
Starting Page	1095
File Format	PDF
ISSN	15359476
e-ISSN	15359484
Journal	Molecular & cellular proteomics : MCP
Issue Number	8
Volume Number	4
Language	English
Publisher Date	2005-05-01
Access Restriction	Open
Subject Keyword	Analytical Chemistry Biochemistry Molecular Biology Research in Higher Education
Content Type	Text
Resource Type	Article
Subject	Medicine Analytical Chemistry Molecular Biology Biochemistry

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