Nephrocystin-1 interacts directly with Ack1 and is expressed in human collecting duct.
Nephronophthisis is characterised by renal fibrosis, tubular basement membrane disruption and corticomedullary cyst formation leading to end stage renal failure. Mutations in NPHP1 account for the underlying genetic defect in 25% of patients with nephronophthisis. Loss of urine concentration ability may be an early feature of nephronophthisis. Using yeast-2-library screening with the SH3 domain of nephrocystin-1 as bait, we identify Ack1 as a novel interaction partner. This interaction is confirmed using exogenous over-expression followed by co-immunoprecipitation. Ack1 is an activated Cdc42-associated kinase, and like nephrocystin-1, is a known interactor of p130Cas. Nephrocystin-1 partially colocalises with Ack1 at cell-cell contacts in IMCD3 cells. In human kidney, nephrocystin-1 expression is limited to cell-cell junctions in renal collecting duct cells. These data define Ack1 as a novel interaction partner of nephrocystin-1 and implicate cell-cell junctions and the renal collecting duct in the pathology of nephronophthisis.
Eley
Lorraine
L
Institute of Human Genetics, International Centre For Life, University of Newcastle upon Tyne, NE1 3BZ, UK.
Moochhala
Shabbir H
SH
Simms
Roslyn
R
Hildebrandt
Friedhelm
F
Sayer
John A
JA
D048868:Adaptor Proteins, Signal Transducing; D002460:Cell Line; D003598:Cytoskeletal Proteins; D006801:Humans; D047468:Immunoprecipitation; D007365:Intercellular Junctions / Q000378:metabolism; D007685:Kidney Tubules, Collecting / Q000166:cytology / Q000378:metabolism*; D008565:Membrane Proteins; D011505:Protein-Tyrosine Kinases / Q000378:metabolism*; D011506:Proteins / Q000235:genetics / Q000378:metabolism*; D020798:Two-Hybrid System Techniques; D018909:src Homology Domains
D048868:Adaptor Proteins, Signal Transducing; D003598:Cytoskeletal Proteins; D008565:Membrane Proteins; C108725:NPHP1 protein, human; D011506:Proteins; D011505:Protein-Tyrosine Kinases; C403262:TNK2 protein, human