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TitleA helical inner scaffold provides a structural basis for centriole cohesion.
Journal, issue, pagesSci Adv, Vol. 6, Issue 7, Page eaaz4137, Year 2020
Publish dateFeb 14, 2020
AuthorsMaeva Le Guennec / Nikolai Klena / Davide Gambarotto / Marine H Laporte / Anne-Marie Tassin / Hugo van den Hoek / Philipp S Erdmann / Miroslava Schaffer / Lubomir Kovacik / Susanne Borgers / Kenneth N Goldie / Henning Stahlberg / Michel Bornens / Juliette Azimzadeh / Benjamin D Engel / Virginie Hamel / Paul Guichard /
PubMed AbstractThe ninefold radial arrangement of microtubule triplets (MTTs) is the hallmark of the centriole, a conserved organelle crucial for the formation of centrosomes and cilia. Although strong cohesion ...The ninefold radial arrangement of microtubule triplets (MTTs) is the hallmark of the centriole, a conserved organelle crucial for the formation of centrosomes and cilia. Although strong cohesion between MTTs is critical to resist forces applied by ciliary beating and the mitotic spindle, how the centriole maintains its structural integrity is not known. Using cryo-electron tomography and subtomogram averaging of centrioles from four evolutionarily distant species, we found that MTTs are bound together by a helical inner scaffold covering ~70% of the centriole length that maintains MTTs cohesion under compressive forces. Ultrastructure Expansion Microscopy (U-ExM) indicated that POC5, POC1B, FAM161A, and Centrin-2 localize to the scaffold structure along the inner wall of the centriole MTTs. Moreover, we established that these four proteins interact with each other to form a complex that binds microtubules. Together, our results provide a structural and molecular basis for centriole cohesion and geometry.
External linksSci Adv / PubMed:32110738 / PubMed Central
MethodsEM (subtomogram averaging)
Resolution16.7 - 32.7 Å
Structure data

EMDB-4926:
Microtubule triplet of isolated Paramecium tetraurelia centriole - inner core
Method: EM (subtomogram averaging) / Resolution: 16.7 Å

EMDB-4927:
Junction between microtubule triplet of isolated Paramecium tetraurelia centriole - inner core region
Method: EM (subtomogram averaging) / Resolution: 32.7 Å

EMDB-4929:
Junction between microtubules triplets of in situ Chlamydomonas reinardtii centriole - inner core region
Method: EM (subtomogram averaging) / Resolution: 31.1 Å

EMDB-4930:
Microtubules triplet of in situ Chlamydomonas reinhardtii centriole - inner core region
Method: EM (subtomogram averaging) / Resolution: 21.8 Å

Source
  • Paramecium tetraurelia (eukaryote)
  • Chlamydomonas reinhardtii (plant)

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