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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+Biol
2016 ; 215
(6
): 823-840
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MOZART1 and ?-tubulin complex receptors are both required to turn ?-TuSC into an
active microtubule nucleation template
#MMPMID27920216
Lin TC
; Neuner A
; Flemming D
; Liu P
; Chinen T
; Jäkle U
; Arkowitz R
; Schiebel E
J Cell Biol
2016[Dec]; 215
(6
): 823-840
PMID27920216
show ga
MOZART1/Mzt1 is required for the localization of ?-tubulin complexes to
microtubule (MT)-organizing centers from yeast to human cells. Nevertheless, the
molecular function of MOZART1/Mzt1 is largely unknown. Taking advantage of the
minimal MT nucleation system of Candida albicans, we reconstituted the
interactions of Mzt1, ?-tubulin small complex (?-TuSC), and ?-tubulin complex
receptors (?-TuCRs) Spc72 and Spc110 in vitro. With affinity measurements, domain
deletion, and swapping, we show that Spc110 and Mzt1 bind to distinct regions of
the ?-TuSC. In contrast, both Mzt1 and ?-TuSC interact with the conserved CM1
motif of Spc110/Spc72. Spc110/Spc72 and Mzt1 constitute "oligomerization
chaperones," cooperatively promoting and directing ?-TuSC oligomerization into MT
nucleation-competent rings. Consistent with the functions of Mzt1, human MOZART1
directly interacts with the CM1-containing region of the ?-TuCR CEP215. MOZART1
depletion in human cells destabilizes the large ?-tubulin ring complex and
abolishes CEP215(CM1)-induced ectopic MT nucleation. Together, we reveal
conserved functions of MOZART1/Mzt1 through interactions with ?-tubulin complex
subunits and ?-TuCRs.