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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 Hum+Mol+Genet
2015 ; 24
(8
): 2185-200
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Nephrocystin proteins NPHP5 and Cep290 regulate BBSome integrity, ciliary
trafficking and cargo delivery
#MMPMID25552655
Barbelanne M
; Hossain D
; Chan DP
; Peränen J
; Tsang WY
Hum Mol Genet
2015[Apr]; 24
(8
): 2185-200
PMID25552655
show ga
Proper functioning of cilia, hair-like structures responsible for sensation and
locomotion, requires nephrocystin-5 (NPHP5) and a multi-subunit complex called
the Bardet-Biedl syndrome (BBS)ome, but their precise relationship is not
understood. The BBSome is involved in the trafficking of membrane cargos to
cilia. While it is known that a loss of any single subunit prevents ciliary
trafficking of the BBSome and its cargos, the mechanisms underlying ciliary entry
of this complex are not well characterized. Here, we report that a transition
zone protein NPHP5 contains two separate BBS-binding sites and interacts with the
BBSome to mediate its integrity. Depletion of NPHP5, or expression of NPHP5
mutant missing one binding site, specifically leads to dissociation of BBS2 and
BBS5 from the BBSome and loss of ciliary BBS2 and BBS5 without compromising the
ability of the other subunits to traffic into cilia. Depletion of Cep290, another
transition zone protein that directly binds to NPHP5, causes additional
dissociation of BBS8 and loss of ciliary BBS8. Furthermore, delivery of BBSome
cargos, smoothened, VPAC2 and Rab8a, to the ciliary compartment is completely
disabled in the absence of single BBS subunits, but is selectively impaired in
the absence of NPHP5 or Cep290. These findings define a new role of NPHP5 and
Cep290 in controlling integrity and ciliary trafficking of the BBSome, which in
turn impinge on the delivery of ciliary cargo.