2.A.94 The Phosphate Permease (Pho1) Family
Pho1 of A. thaliana is a member of the PHO1 family (11 paralogues in A. thaliana). It functions in inorganic phosphate transport and homeostasis. Pho1 catalyzes efflux of phosphate from epidermal and cortical cells into the xylem (Quaghebeur and Rengel, 2004; Stefanovic et al., 2007). The SPX superfamily domain is an N-terminal soluble domain. These proteins belong to the EXS (Erd1/Xpr1/Syg1) superfamily.
The generalized reaction catalyzed by Pho1 is:
Pi (cells) → Pi (xylem)
This family belongs to the IT Superfamily.