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Michelot A, et al.  (2010) Reconstitution and protein composition analysis of endocytic actin patches. Curr Biol 20(21):1890-9

Abstract: BACKGROUND: Clathrin-actin-mediated endocytosis in yeast involves the progressive assembly of at least 60 different proteins at cortical sites. More than half of these proteins are involved in the assembly of a branched network of actin filaments to provide the forces required for plasma membrane invagination. RESULTS: To gain insights into the regulation of endocytic actin patch dynamics, we developed an in vitro actin assembly assay using microbeads functionalized with the nucleation promoting factor (NPF) Las17 (yeast WASP). When incubated in a yeast extract, these beads assembled actin networks, and a significant fraction became motile. Multidimensional protein identification technology (MudPIT) showed that the recruitment of actin-binding proteins to these Las17-derived actin networks is selective. None of the proteins known to exclusively regulate the in vivo formation of actin cables or the actin contractile ring were identified. Our analysis also identified components of three other cortical structures, eisosomes, phosphoinositide kinase (PIK) patches, and the TORC2 complex, establishing intriguing biochemical connections between four different yeast cortical complexes. Finally, we identified Aim3 as a regulator of actin dynamics at endocytic sites. CONCLUSIONS: WASP is sufficient to trigger assembly of actin networks composed selectively of actin patch proteins. These experiments establish that the protein composition of different F-actin structures is determined by the protein factor that initiates the network. The identification of binding partners revealed new biochemical connections between WASP-derived networks and other cortical complexes and identified Aim3 as a novel regulator of the endocytic actin patch.CI - Copyright (c) 2010 Elsevier Ltd. All rights reserved.

Status: Published Type: Journal Article PubMed ID: 21035341

Topics addressed in this paper

Number of different genes curated to this paper: 90

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Topics Topics not linked to Genes Genes linked to topics (#1 - 10 )
ABP1 ABP140 ACB1 ACT1 ADE17 AIM3 APP1 ARC15 ARC18 ARC19
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Topics Genes linked to topics (#11 - 20 )
ARC35 ARC40 ARP2 ARP3 AVO1 AVO2 BBC1 BIT61 BSP1 BZZ1
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Topics Genes linked to topics (#21 - 30 )
CAJ1 CAP1 CAP2 CMD1 CRN1 CUE5 EFR3 EIS1 FAA1 GCS1
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Topics Genes linked to topics (#31 - 40 )
HSC82 HSL1 HSP42 HSP82 IVY1 KES1 KOG1 LAS17 LSB3 LSP1
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Topics Genes linked to topics (#41 - 50 )
MAE1 MDJ1 MLC1 MSC3 MSS4 MYO3 MYO5 NDT80 NSP1 NUP2
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Topics Genes linked to topics (#51 - 60 )
OPY1 OSH2 PBP1 PCT1 PIL1 PPZ1 PRK1 RVS161 RVS167 SAC6
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Topics Genes linked to topics (#61 - 70 )
SAP1 SCP1 SEC16 SEG1 SEG2 SHE3 SLA1 SLM1 SLM2 SPA2
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Topics Genes linked to topics (#71 - 80 )
STT4 SYP1 TAX4 TCO89 TOR1 TOR2 TRX2 TSC11 TWF1 UBP7
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Topics Genes linked to topics (#81 - 90 )
VMA2 VPS13 YFR016C YGR130C YGR266W YLR278C YPL150W YPP1 YSC84 YTA6
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