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2017 ; 8
(ä): 15035
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Subnanometre-resolution structure of the doublet microtubule reveals new classes
of microtubule-associated proteins
#MMPMID28462916
Ichikawa M
; Liu D
; Kastritis PL
; Basu K
; Hsu TC
; Yang S
; Bui KH
Nat Commun
2017[May]; 8
(ä): 15035
PMID28462916
show ga
Cilia are ubiquitous, hair-like appendages found in eukaryotic cells that carry
out functions of cell motility and sensory reception. Cilia contain an intriguing
cytoskeletal structure, termed the axoneme that consists of nine doublet
microtubules radially interlinked and longitudinally organized in multiple
specific repeat units. Little is known, however, about how the axoneme allows
cilia to be both actively bendable and sturdy or how it is assembled. To answer
these questions, we used cryo-electron microscopy to structurally analyse several
of the repeating units of the doublet at sub-nanometre resolution. This
structural detail enables us to unambiguously assign ?- and ?-tubulins in the
doublet microtubule lattice. Our study demonstrates the existence of an inner
sheath composed of different kinds of microtubule inner proteins inside the
doublet that likely stabilizes the structure and facilitates the specific
building of the B-tubule.