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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 J+Cell+Sci
2017 ; 130
(9
): 1637-1651
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SKIP controls lysosome positioning using a composite kinesin-1 heavy and light
chain-binding domain
#MMPMID28302907
Sanger A
; Yip YY
; Randall TS
; Pernigo S
; Steiner RA
; Dodding MP
J Cell Sci
2017[May]; 130
(9
): 1637-1651
PMID28302907
show ga
The molecular interplay between cargo recognition and regulation of the activity
of the kinesin-1 microtubule motor is not well understood. Using the lysosome
adaptor SKIP (also known as PLEKHM2) as model cargo, we show that the kinesin
heavy chains (KHCs), in addition to the kinesin light chains (KLCs), can
recognize tryptophan-acidic-binding determinants on the cargo when presented in
the context of an extended KHC-interacting domain. Mutational separation of KHC
and KLC binding shows that both interactions are important for SKIP-kinesin-1
interaction in vitro and that KHC binding is important for lysosome transport in
vivo However, in the absence of KLCs, SKIP can only bind to KHC when
autoinhibition is relieved, suggesting that the KLCs gate access to the KHCs. We
propose a model whereby tryptophan-acidic cargo is first recognized by KLCs,
resulting in destabilization of KHC autoinhibition. This primary event then makes
accessible a second SKIP-binding site on the KHC C-terminal tail that is adjacent
to the autoinhibitory IAK region. Thus, cargo recognition and concurrent
activation of kinesin-1 proceed in hierarchical stepwise fashion driven by a
dynamic network of inter- and intra-molecular interactions.
|Adaptor Proteins, Signal Transducing/chemistry/*metabolism
[MESH]