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Structural and mechanistic insights into regulation of the retromer coat by TBC1d5
Abstract
Retromer is a membrane coat complex that is recruited to endosomes by the small GTPase Rab7 and sorting nexin 3. The timing of this interaction and consequent endosomal dynamics are thought to be regulated by the guanine nucleotide cycle of Rab7. Here we demonstrate that TBC1d5, a GTPase-activating protein (GAP) for Rab7, is a high-affinity ligand of the retromer cargo selective complex VPS26/VPS29/VPS35. The crystal structure of the TBC1d5 GAP domain bound to VPS29 and complementary biochemical and cellular data show that a loop from TBC1d5 binds to a conserved hydrophobic pocket on VPS29 opposite the VPS29–VPS35 interface. Additional data suggest that a distinct loop of the GAP domain may contact VPS35. Loss of TBC1d5 causes defective retromer-dependent trafficking of receptors. Our findings illustrate how retromer recruits a GAP, which is likely to be involved in the timing of Rab7 inactivation leading to membrane uncoating, with important consequences for receptor trafficking.
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In the citing paper
“Consistent with published structural data, AlphaFold2 predicted the association of a conserved surface-exposed hydrophobic cavity on VPS29 (defined by Leu152) with Pro-Leu (PL) motifs from TBC1D5 (141PL142) and VARP (713PL714) and for TBC1D5, the association of an additional 283Ile-Pro-Phe285 hydrophobic motif with VPS35 (Supplementary Fig. 5)77,82.”
From Mapping of endosomal proximity proteomes reveals Retromer as a hub for RAB GTPase regulation (2025) · cites this paper as [77]
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“The Retromer proximity proteome has highlighted a close association with regulators of small GTPases, including well-established Retromer accessory proteins TBC1D5 and ANKRD2777,82.”
From Mapping of endosomal proximity proteomes reveals Retromer as a hub for RAB GTPase regulation (2025) · cites this paper as [77]
In the citing paper
“These included known Retromer accessory proteins, the RAB7 GAP TBC1D546,77–81, the RAB21/RAB32/RAB38 GEF VARP (a.k.a. ANKRD27)47,48,82, and the RAB10 GEFs DENND4A and DENND4C83,84.”
From Mapping of endosomal proximity proteomes reveals Retromer as a hub for RAB GTPase regulation (2025) · cites this paper as [77]
In the citing paper
“As for TBC domain-containing GAPs, confident prediction was observed for VPS29 with TBC1D13 and the previously characterised TBC1D577.”
From Mapping of endosomal proximity proteomes reveals Retromer as a hub for RAB GTPase regulation (2025) · cites this paper as [77]
In the citing paper
“In all cases, the accessory protein directly associates with Retromer through presentation of PL motifs to the same hydrophobic pocket in VPS29 that accommodates PL motifs from TBC1D5, ANKRD27 and the FAM21 subunit of the WASH complex44,77,82,114.”
From Mapping of endosomal proximity proteomes reveals Retromer as a hub for RAB GTPase regulation (2025) · cites this paper as [77]
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Structural organization of the retriever–CCC endosomal recycling complex
Boesch, D. J., Singla, A., Han, Y., Kramer, D. A., Liu, Q., Suzuki, K., Juneja, P., Zhao, X., Long, X., Medlyn, M. J., et al. (2024) · Nature Structural & Molecular Biology · doi:10.1038/s41594-023-01184-4 · Cited by 52
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Mapping of endosomal proximity proteomes reveals Retromer as a hub for RAB GTPase regulation
Antón-Plágaro, C., Chen, K.-E., Guo, Q., Liu, M., Evans, A. J., Lewis, P. A., Heesom, K. J., Wilkinson, K. A., Collins, B. M., & Cullen, P. J. (2025) · Nature Communications · doi:10.1038/s41467-025-61802-1 · Cited by 14
Metadata
- Authors
- Jia, D., Zhang, J.-S., Li, F., Wang, J., Deng, Z., White, M. A., Osborne, D. G., Phillips-Krawczak, C., Gomez, T. S., Li, H., Singla, A., Burstein, E., Billadeau, D. D., & Rosen, M. K.
- Venue
- Nature Communications
- Published
- 2016-11-09
- Volume
- 7
- Issue
- 1
- ISSN
- 2041-1723
- PMC
- PMC5105194
- Cited by
- 118
- References
- 2
- Language
- en
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