Aquaporins facilitate the transport of water and small neutral solutes across cell membranes. Interacts with cucumber mosaic virus (CMV) Protein 1a. Tonoplast. Expressed above groung and in roots. Aquaporins contain two tandem repeats each containing three membrane-spanning domains and a pore-forming loop with the signature motif Asn-Pro-Ala (NPA). Belongs to the MIP/aquaporin (TC 1.A.8) family. TIP (TC 1.A.8.10) subfamily.