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Comparative phosphoproteomic analysis of mammalian glomeruli reveals conserved podocin C‐terminal phosphorylation as a determinant of slit diaphragm complex architecture
Author(s) -
Rinschen Markus M.,
Pahmeyer Caroline,
Pisitkun Trairak,
Schnell Nicole,
Wu Xiongwu,
Maaß Martina,
Bartram Malte P.,
Lamkemeyer Tobias,
Schermer Bernhard,
Benzing Thomas,
Brinkkoetter Paul T.
Publication year - 2015
Publication title -
proteomics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.26
H-Index - 167
eISSN - 1615-9861
pISSN - 1615-9853
DOI - 10.1002/pmic.201400235
Subject(s) - phosphorylation , podocin , nephrin , slit diaphragm , biology , protein phosphorylation , podocyte , microbiology and biotechnology , phosphoproteomics , tyrosine phosphorylation , dephosphorylation , biochemistry , phosphatase , protein kinase a , genetics , proteinuria , kidney
Glomerular biology is dependent on tightly controlled signal transduction networks that control phosphorylation of signaling proteins such as cytoskeletal regulators or slit diaphragm proteins of kidney podocytes. Cross-species comparison of phosphorylation events is a powerful mean to functionally prioritize and identify physiologically meaningful phosphorylation sites. Here, we present the result of phosphoproteomic analyses of cow and rat glomeruli to allow cross-species comparisons. We discovered several phosphorylation sites with potentially high biological relevance, e.g. tyrosine phosphorylation of the cytoskeletal regulator synaptopodin and the slit diaphragm protein neph-1 (Kirrel). Moreover, cross-species comparisons revealed conserved phosphorylation of the slit diaphragm protein nephrin on an acidic cluster at the intracellular terminus and conserved podocin phosphorylation on the very carboxyl terminus of the protein. We studied a highly conserved podocin phosphorylation site in greater detail and show that phosphorylation regulates affinity of the interaction with nephrin and CD2AP. Taken together, these results suggest that species comparisons of phosphoproteomic data may reveal regulatory principles in glomerular biology. All MS data have been deposited in the ProteomeXchange with identifier PXD001005 (http://proteomecentral.proteomexchange.org/dataset/PXD001005).

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