Pho1 family

The Pho1 phosphate permease family is a family of phosphate transporters belonging to the ion transporter (IT) superfamily. Representative members of the Pho1 family include the putative phosphate transporter PHO1 of Arabidopsis thaliana, and the xenotropic and polytropic murine-leukemia virus receptor Xpr1 of Metazoa, such as Homo sapiens, Drosophila, and Culex pipiens.

Pho1

Pho1 of A. thaliana is a member of the PHO1 family. This protein is 782 amino acyl residues in length and possesses 7 transmembrane segments. It functions in inorganic phosphate transport and homeostasis. Pho1 catalyzes efflux of phosphate from epidermal and cortical cells into the xylem. The SPX superfamily domain is an N-terminal soluble domain. These proteins belong to the EXS superfamily.
The generalized reaction catalyzed by Pho1 is:

P_i → P_i