[PMID]: | 23733933 |
[Au] Autor: | Park M; Song K; Reichardt I; Kim H; Mayer U; Stierhof YD; Hwang I; Jürgens G |
[Ad] Endereço: | Entwicklungsgenetik and Microscopy, Zentrum für Molekularbiologie der Pflanzen (ZMBP), University of Tübingen, 72076 Tübingen, Germany. |
[Ti] Título: | Arabidopsis µ-adaptin subunit AP1M of adaptor protein complex 1 mediates late secretory and vacuolar traffic and is required for growth. |
[So] Source: | Proc Natl Acad Sci U S A;110(25):10318-23, 2013 Jun 18. |
[Is] ISSN: | 1091-6490 |
[Cp] País de publicação: | United States |
[La] Idioma: | eng |
[Ab] Resumo: | Adaptor protein (AP) complexes are the predominant coat proteins of membrane vesicles in post-Golgi trafficking of mammalian cells. Each AP complex contains a specific medium subunit, µ-adaptin, that selects cargo proteins bearing sequence-specific sorting motifs. Much less is known about the AP complexes and their µ subunits in plants. Because of uncertain homology, the µ-adaptins of Arabidopsis have been designated muA through muD [Happel et al. (2004) Plant J 37(5):678-693]. Furthermore, only muD has been assigned to a specific AP complex, AP-3, involved in Golgi-vacuolar trafficking [Niihama et al. (2009) Plant Cell Physiol 50(12):2057-2068, Zwiewka et al. (2011) Cell Res 21(12):1711-1722, and Wolfenstetter et al. (2012) Plant Cell 24(1):215-232]. In contrast, the µ subunit of neither the post-Golgi trafficking AP-1 complex nor the endocytic AP-2 complex has been identified. Here, we report the functional analysis of redundant AP-1 µ-adaptins AP1M1 (also known as muB1) and AP1M2 (also known as muB2). Coimmunoprecipitation revealed that both AP1M2 and its less strongly expressed isoform AP1M1 are complexed with the large subunit γ-adaptin of AP-1. In addition, AP1M2 was localized at or near the trans-Golgi network. Knockout mutations of AP1M2 impaired pollen function and arrested plant growth whereas the ap1m1 ap1m2 double mutant was nearly pollen-lethal. At the cellular level, the absence of AP1M2 entailed inhibition of multiple trafficking pathways from the trans-Golgi network to the vacuole and to the plasma membrane in interphase and to the plane of cell division in cytokinesis. Thus, AP-1 is crucial in post-Golgi trafficking in plant cells and required for cell division and plant growth. |
[Mh] Termos MeSH primário: |
Complexo 1 de Proteínas Adaptadoras/metabolismo Subunidades mu do Complexo de Proteínas Adaptadoras/metabolismo Proteínas de Arabidopsis/metabolismo Arabidopsis/crescimento & desenvolvimento Arabidopsis/genética Transporte Proteico/fisiologia
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[Mh] Termos MeSH secundário: |
Complexo 1 de Proteínas Adaptadoras/genética Subunidades alfa do Complexo de Proteínas Adaptadoras/metabolismo Subunidades gama do Complexo de Proteínas Adaptadoras/metabolismo Subunidades mu do Complexo de Proteínas Adaptadoras/genética Arabidopsis/metabolismo Proteínas de Arabidopsis/genética Membrana Celular/fisiologia Membrana Celular/ultraestrutura Citocinese/fisiologia Complexo de Golgi/metabolismo Complexo de Golgi/ultraestrutura Interfase/fisiologia Microscopia Eletrônica de Transmissão Mutagênese Insercional Vesículas Secretórias/metabolismo Vesículas Secretórias/ultraestrutura Vacúolos/metabolismo Vacúolos/ultraestrutura Rede trans-Golgi/metabolismo Rede trans-Golgi/ultraestrutura
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[Pt] Tipo de publicação: | JOURNAL ARTICLE; RESEARCH SUPPORT, NON-U.S. GOV'T |
[Nm] Nome de substância:
| 0 (AP1M1 protein, Arabidopsis); 0 (AP1M2 protein, Arabidopsis); 0 (Adaptor Protein Complex 1); 0 (Adaptor Protein Complex alpha Subunits); 0 (Adaptor Protein Complex gamma Subunits); 0 (Adaptor Protein Complex mu Subunits); 0 (Arabidopsis Proteins); 0 (adaptor protein complex 1, mu 1 subunit); 0 (adaptor protein complex 1, mu 2 subunit) |
[Em] Mês de entrada: | 1309 |
[Cu] Atualização por classe: | 170220 |
[Lr] Data última revisão:
| 170220 |
[Sb] Subgrupo de revista: | IM |
[Da] Data de entrada para processamento: | 130605 |
[St] Status: | MEDLINE |
[do] DOI: | 10.1073/pnas.1300460110 |
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