title: Impaired KLHL3-mediated ubiquitination of WNK4 causes human hypertension.
abstract: Mutations in WNK kinases cause the human hypertensive disease pseudohypoaldosteronism type II (PHAII), but the regulatory mechanisms of the WNK kinases are not well understood. Mutations in kelch-like 3 (KLHL3) and Cullin3 were also recently identified as causing PHAII. Therefore, new insights into the mechanisms of human hypertension can be gained by determining how these components interact and how they are involved in the pathogenesis of PHAII. Here, we found that KLHL3 interacted with Cullin3 and WNK4, induced WNK4 ubiquitination, and reduced the WNK4 protein level. The reduced interaction of KLHL3 and WNK4 by PHAII-causing mutations in either protein reduced the ubiquitination of WNK4, resulting in an increased level of WNK4 protein. Transgenic mice overexpressing WNK4 showed PHAII phenotypes, and WNK4 protein was indeed increased in Wnk4(D561A/+) PHAII model mice. Thus, WNK4 is a target for KLHL3-mediated ubiquitination, and the impaired ubiquitination of WNK4 is a common mechanism of human hereditary hypertension.
authors: Department of Nephrology, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University, 1-5-45 Yushima, Bunkyo, Tokyo 113-8519, Japan.
authors: Mai
authors: M
authors: Wakabayashi
authors: Takayasu
authors: T
authors: Mori
authors: Kiyoshi
authors: K
authors: Isobe
authors: Eisei
authors: E
authors: Sohara
authors: Koichiro
authors: K
authors: Susa
authors: Yuya
authors: Y
authors: Araki
authors: Motoko
authors: M
authors: Chiga
authors: Eriko
authors: E
authors: Kikuchi
authors: Naohiro
authors: N
authors: Nomura
authors: Yutaro
authors: Y
authors: Mori
authors: Hiroshi
authors: H
authors: Matsuo
authors: Tomohiro
authors: T
authors: Murata
authors: Shinsuke
authors: S
authors: Nomura
authors: Takako
authors: T
authors: Asano
authors: Hiroyuki
authors: H
authors: Kawaguchi
authors: Shigeaki
authors: S
authors: Nonoyama
authors: Tatemitsu
authors: T
authors: Rai
authors: Sei
authors: S
authors: Sasaki
authors: Shinichi
authors: S
authors: Uchida
mesh_terms: D048868:Adaptor Proteins, Signal Transducing; D000818:Animals; D002352:Carrier Proteins / Q000235:genetics / Q000378:metabolism*; D044842:Cullin Proteins / Q000378:metabolism; D057809:HEK293 Cells; D006801:Humans; D051379:Mice; D008840:Microfilament Proteins; D009154:Mutation; D010641:Phenotype; D011485:Protein Binding; D017346:Protein Serine-Threonine Kinases / Q000235:genetics / Q000378:metabolism*; D011546:Pseudohypoaldosteronism / Q000209:etiology / Q000235:genetics / Q000378:metabolism*; D014158:Transcription, Genetic; D054875:Ubiquitination
chemical_list: D048868:Adaptor Proteins, Signal Transducing; D002352:Carrier Proteins; D044842:Cullin Proteins; C489837:KLHL3 protein, human; D008840:Microfilament Proteins; C499024:Prkwnk4 protein, mouse; D017346:Protein Serine-Threonine Kinases