ジャーナル: Cell / 年: 2024 タイトル: Extensive structural rearrangement of intraflagellar transport trains underpins bidirectional cargo transport. 著者: Samuel E Lacey / Andrea Graziadei / Gaia Pigino / 要旨: Bidirectional transport in cilia is carried out by polymers of the IFTA and IFTB protein complexes, called anterograde and retrograde intraflagellar transport (IFT) trains. Anterograde trains deliver ...Bidirectional transport in cilia is carried out by polymers of the IFTA and IFTB protein complexes, called anterograde and retrograde intraflagellar transport (IFT) trains. Anterograde trains deliver cargoes from the cell to the cilium tip, then convert into retrograde trains for cargo export. We set out to understand how the IFT complexes can perform these two directly opposing roles before and after conversion. We use cryoelectron tomography and in situ cross-linking mass spectrometry to determine the structure of retrograde IFT trains and compare it with the known structure of anterograde trains. The retrograde train is a 2-fold symmetric polymer organized around a central thread of IFTA complexes. We conclude that anterograde-to-retrograde remodeling involves global rearrangements of the IFTA/B complexes and requires complete disassembly of the anterograde train. Finally, we describe how conformational changes to cargo-binding sites facilitate unidirectional cargo transport in a bidirectional system.
全体 : In situ retrograde intraflagellar transport trains in dhc1b-3 mut...
全体
名称: In situ retrograde intraflagellar transport trains in dhc1b-3 mutant Chlamydomonas reinhardtii cilia
要素
細胞: In situ retrograde intraflagellar transport trains in dhc1b-3 mutant Chlamydomonas reinhardtii cilia
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超分子 #1: In situ retrograde intraflagellar transport trains in dhc1b-3 mut...
超分子
名称: In situ retrograde intraflagellar transport trains in dhc1b-3 mutant Chlamydomonas reinhardtii cilia タイプ: cell / ID: 1 / 親要素: 0 詳細: Temperature sensitive cells incubated at restrictive temperature (34 degrees C) for 10 hours and plunge frozen on grids.