The motor domain of the kinesin Kip2 promotes microtubule polymerization at microtubule tips
© 2023 Chen et al..
Kinesins are microtubule-dependent motor proteins, some of which moonlight as microtubule polymerases, such as the yeast protein Kip2. Here, we show that the CLIP-170 ortholog Bik1 stabilizes Kip2 at microtubule ends where the motor domain of Kip2 promotes microtubule polymerization. Live-cell imaging and mathematical estimation of Kip2 dynamics reveal that disrupting the Kip2-Bik1 interaction aborts Kip2 dwelling at microtubule ends and abrogates its microtubule polymerization activity. Structural modeling and biochemical experiments identify a patch of positively charged residues that enables the motor domain to bind free tubulin dimers alternatively to the microtubule shaft. Neutralizing this patch abolished the ability of Kip2 to promote microtubule growth both in vivo and in vitro without affecting its ability to walk along microtubules. Our studies suggest that Kip2 utilizes Bik1 as a cofactor to track microtubule tips, where its motor domain then recruits free tubulin and catalyzes microtubule assembly.
| Medienart: |
E-Artikel |
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| Erscheinungsjahr: |
2023 |
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| Erschienen: |
2023 |
| Enthalten in: |
Zur Gesamtaufnahme - volume:222 |
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| Enthalten in: |
The Journal of cell biology - 222(2023), 7 vom: 03. Juli |
| Sprache: |
Englisch |
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| Beteiligte Personen: |
Chen, Xiuzhen [VerfasserIn] |
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| Links: |
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| Anmerkungen: |
Date Completed 28.04.2023 Date Revised 24.05.2023 published: Print-Electronic Citation Status MEDLINE |
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| doi: |
10.1083/jcb.202110126 |
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| funding: |
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| Förderinstitution / Projekttitel: |
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| PPN (Katalog-ID): |
NLM355968312 |
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| 100 | 1 | |a Chen, Xiuzhen |e verfasserin |4 aut | |
| 245 | 1 | 4 | |a The motor domain of the kinesin Kip2 promotes microtubule polymerization at microtubule tips |
| 264 | 1 | |c 2023 | |
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| 500 | |a Date Completed 28.04.2023 | ||
| 500 | |a Date Revised 24.05.2023 | ||
| 500 | |a published: Print-Electronic | ||
| 500 | |a Citation Status MEDLINE | ||
| 520 | |a © 2023 Chen et al. | ||
| 520 | |a Kinesins are microtubule-dependent motor proteins, some of which moonlight as microtubule polymerases, such as the yeast protein Kip2. Here, we show that the CLIP-170 ortholog Bik1 stabilizes Kip2 at microtubule ends where the motor domain of Kip2 promotes microtubule polymerization. Live-cell imaging and mathematical estimation of Kip2 dynamics reveal that disrupting the Kip2-Bik1 interaction aborts Kip2 dwelling at microtubule ends and abrogates its microtubule polymerization activity. Structural modeling and biochemical experiments identify a patch of positively charged residues that enables the motor domain to bind free tubulin dimers alternatively to the microtubule shaft. Neutralizing this patch abolished the ability of Kip2 to promote microtubule growth both in vivo and in vitro without affecting its ability to walk along microtubules. Our studies suggest that Kip2 utilizes Bik1 as a cofactor to track microtubule tips, where its motor domain then recruits free tubulin and catalyzes microtubule assembly | ||
| 650 | 4 | |a Journal Article | |
| 650 | 4 | |a Research Support, Non-U.S. Gov't | |
| 650 | 7 | |a Kinesins |2 NLM | |
| 650 | 7 | |a EC 3.6.4.4 |2 NLM | |
| 650 | 7 | |a Microtubule-Associated Proteins |2 NLM | |
| 650 | 7 | |a Tubulin |2 NLM | |
| 650 | 7 | |a KIP2 protein, S cerevisiae |2 NLM | |
| 650 | 7 | |a Bik1 protein, S cerevisiae |2 NLM | |
| 650 | 7 | |a Saccharomyces cerevisiae Proteins |2 NLM | |
| 650 | 7 | |a Molecular Motor Proteins |2 NLM | |
| 700 | 1 | |a Portran, Didier |e verfasserin |4 aut | |
| 700 | 1 | |a Widmer, Lukas A |e verfasserin |4 aut | |
| 700 | 1 | |a Stangier, Marcel M |e verfasserin |4 aut | |
| 700 | 1 | |a Czub, Mateusz P |e verfasserin |4 aut | |
| 700 | 1 | |a Liakopoulos, Dimitris |e verfasserin |4 aut | |
| 700 | 1 | |a Stelling, Jörg |e verfasserin |4 aut | |
| 700 | 1 | |a Steinmetz, Michel O |e verfasserin |4 aut | |
| 700 | 1 | |a Barral, Yves |e verfasserin |4 aut | |
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| 856 | 4 | 0 | |u http://dx.doi.org/10.1083/jcb.202110126 |3 Volltext |
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