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.jpg): Failed to open stream: No such file or directory in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 117 Nat+Commun
2016 ; 7
(ä): 10777
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Phosphatidylinositol phosphate kinase PIPKI? and phosphatase INPP5E coordinate
initiation of ciliogenesis
#MMPMID26916822
Xu Q
; Zhang Y
; Wei Q
; Huang Y
; Hu J
; Ling K
Nat Commun
2016[Feb]; 7
(ä): 10777
PMID26916822
show ga
Defective primary cilia are causative to a wide spectrum of human genetic
disorders, termed ciliopathies. Although the regulation of ciliogenesis is
intensively studied, how it is initiated remains unclear. Here we show that type
I? phosphatidylinositol 4-phosphate (PtdIns(4)P) 5-kinase (PIPKI?) and inositol
polyphosphate-5-phosphatase E (INPP5E), a Joubert syndrome protein, localize to
the centrosome and coordinate the initiation of ciliogenesis. PIPKI? counteracts
INPP5E in regulating tau-tubulin kinase-2 (TTBK2) recruitment to the basal body,
which promotes the removal of microtubule capping protein CP110 and the
subsequent axoneme elongation. Interestingly, INPP5E and its
product--PtdIns(4)P--accumulate at the centrosome/basal body in non-ciliated, but
not ciliated, cells. PtdIns(4)P binding to TTBK2 and the distal appendage protein
CEP164 compromises the TTBK2-CEP164 interaction and inhibits the recruitment of
TTBK2. Our results reveal that PtdIns(4)P homoeostasis, coordinated by PIPKI? and
INPP5E at the centrosome/ciliary base, is vital for ciliogenesis by regulating
the CEP164-dependent recruitment of TTBK2.