2.A.106.1.5
Chloroplast thylakoid GDT-1-like protein or photosynthesis-affected protein-71, PAM71 or CCHA1 of 370 aas with 6 TMSs in a 3 + 3 TMS arrangement. It takes up Mn²⁺ and influences both Mn²⁺ and Ca²⁺ homeostasis in the chloroplast.  It is necessary for photosystem II function due to its Mn²⁺ uptake activity (Schneider et al. 2016; Hoecker et al. 2017).  It is an Mn²⁺/H⁺ exchanger, which transport Mn²⁺ from the chloroplast stroma into the acidic thylakoid lumen (Schneider et al. 2016).  It might be a chloroplast-localized Ca²⁺/H⁺ antiporter as well (Wang et al. 2016) since it regulates Ca²⁺, Mn²⁺ and pH homeostasis and is required for chloroplast development.