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-Structure paper
タイトル | Structural basis for the extended CAP-Gly domains of p150(glued) binding to microtubules and the implication for tubulin dynamics. |
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ジャーナル・号・ページ | Proc Natl Acad Sci U S A, Vol. 111, Issue 31, Page 11347-11352, Year 2014 |
掲載日 | 2014年8月5日 |
著者 | Qianmin Wang / Alvaro H Crevenna / Ines Kunze / Naoko Mizuno / |
PubMed 要旨 | p150(glued) belongs to a group of proteins accumulating at microtubule plus ends (+TIPs). It plays a key role in initiating retrograde transport by recruiting and tethering endosomes and dynein to ...p150(glued) belongs to a group of proteins accumulating at microtubule plus ends (+TIPs). It plays a key role in initiating retrograde transport by recruiting and tethering endosomes and dynein to microtubules. p150(glued) contains an N-terminal microtubule-binding cytoskeleton-associated protein glycine-rich (CAP-Gly) domain that accelerates tubulin polymerization. Although this copolymerization is well-studied using light microscopic techniques, structural consequences of this interaction are elusive. Here, using electron-microscopic and spectroscopic approaches, we provide a detailed structural view of p150(glued) CAP-Gly binding to microtubules and tubulin. Cryo-EM 3D reconstructions of p150(glued)-CAP-Gly complexed with microtubules revealed the recognition of the microtubule surface, including tubulin C-terminal tails by CAP-Gly. These binding surfaces differ from other retrograde initiation proteins like EB1 or dynein, which could facilitate the simultaneous attachment of all accessory components. Furthermore, the CAP-Gly domain, with its basic extensions, facilitates lateral and longitudinal interactions of tubulin molecules by covering the tubulin acidic tails. This shielding effect of CAP-Gly and its basic extensions may provide a molecular basis of the roles of p150(glued) in microtubule dynamics. |
リンク | Proc Natl Acad Sci U S A / PubMed:25059720 / PubMed Central |
手法 | EM (らせん対称) |
解像度 | 9.7 - 12.0 Å |
構造データ | EMDB-2673: EMDB-2674: EMDB-2675: |
由来 |
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