National Institutes of Health/National Human Genome Research Institute (NIH/NHGRI)
GM031627
米国
Howard Hughes Medical Institute (HHMI)
米国
National Institutes of Health/National Human Genome Research Institute (NIH/NHGRI)
GM118099
米国
European Union (EU)
SAF2017-84565-R
European Union
引用
ジャーナル: Elife / 年: 2019 タイトル: Electron cryo-tomography provides insight into procentriole architecture and assembly mechanism. 著者: Sam Li / Jose-Jesus Fernandez / Wallace F Marshall / David A Agard / 要旨: Centriole is an essential structure with multiple functions in cellular processes. Centriole biogenesis and homeostasis is tightly regulated. Using electron cryo-tomography (cryoET) we present the ...Centriole is an essential structure with multiple functions in cellular processes. Centriole biogenesis and homeostasis is tightly regulated. Using electron cryo-tomography (cryoET) we present the structure of procentrioles from . We identified a set of non-tubulin components attached to the triplet microtubule (MT), many are at the junctions of tubules likely to reinforce the triplet. We describe structure of the A-C linker that bridges neighboring triplets. The structure infers that POC1 is likely an integral component of A-C linker. Its conserved WD40 β-propeller domain provides attachment sites for other A-C linker components. The twist of A-C linker results in an iris diaphragm-like motion of the triplets in the longitudinal direction of procentriole. Finally, we identified two assembly intermediates at the growing ends of procentriole allowing us to propose a model for the procentriole assembly. Our results provide a comprehensive structural framework for understanding the molecular mechanisms underpinning procentriole biogenesis and assembly.