Arabidopsis SNAREs SYP61 and SYP121 Coordinate the Trafficking of Plasma Membrane Aquaporin PIP2;7 to Modulate the Cell Membrane Water Permeability

• Published in: The Plant cell 2014-07, Vol.26 (7), p.3132-3147
• Main Authors: Hachez, Chartes, Laloux, Timothée, Reinhardt, Hagen, Cavez, Damien, Degand, Hervé, Grefen, Christopher, De Rycke, Riet, lnzé, Dirk, Blatt, Michael R., Russinova, Eugenia, Chaumont, François
• Format: Article
• Language: English
• Subjects: Aquaporins; Aquaporins - genetics; Aquaporins - metabolism; Arabidopsis - cytology; Arabidopsis - genetics; Arabidopsis - physiology; Arabidopsis Proteins - genetics; Arabidopsis Proteins - metabolism; Cell Membrane - metabolism; Cell Membrane Permeability; Cell membranes; Epidermal cells; Genes, Reporter; Golgi Apparatus - metabolism; Mutagenesis, Insertional; Physiological regulation; Plant cells; Plant Roots - cytology; Plant Roots - genetics; Plant Roots - physiology; Plant Stomata - cytology; Plant Stomata - genetics; Plant Stomata - physiology; Plants; Plants, Genetically Modified; Plasma interactions; Protein Transport; Proteins; Proteomics; Protoplasts; Qa-SNARE Proteins - genetics; Qa-SNARE Proteins - metabolism; Recombinant Fusion Proteins; Seedlings - cytology; Seedlings - genetics; Seedlings - physiology; SNARE proteins; SNARE Proteins - genetics; SNARE Proteins - metabolism; Water - metabolism
• ISSN: 1040-4651; 1532-298X
• DOI: 10.1105/tpc.114.127159

Plant plasma membrane intrinsic proteins (PIPs) are aquaporins that facilitate the passive movement of water and small neutral solutes through biological membranes. Here, we report that post-Golgi trafficking of PIP2;7 in Arabidopsis thaliana involves specific interactions with two syntaxin proteins, namely, the Qc-SNARE SYP61 and the Qa-SNARE SYP121, that the proper delivery of PIP2;7 to the plasma membrane depends on the activity of the two SNAREs, and that the SNAREs colocalize and physically interact. These findings are indicative of an important role for SYP61 and SYP121, possibly forming a SNARE complex. Our data support a model in which direct interactions between specific SNARE proteins and PIP aquaporins modulate their post-Golgi trafficking and thus contribute to the fine-tuning of the water permeability of the plasma membrane.