MRP4 — Zea mays

Summary

ZM00001EB314470, designated MRP4 on maize chromosome 7, encodes an ATP-binding cassette (ABC) transporter of the ABCC subfamily, possessing ATP hydrolase activity and annotated with aluminium ion transporter, sulfate ABC transporter, thiosulphate ABC transporter, UDP-glucose transmembrane transporter, and phosphate transmembrane transporter activities. The gene is associated with detoxification of hydrogen peroxide and aluminium ions, aluminium ion transmembrane transport, cellular responses to potassium ion starvation, inositol phosphate metabolism, cell wall biogenesis and assembly, oxidative phosphorylation, and secretion. MRP4 has been linked to agronomically important traits including aluminium tolerance, drought tolerance, biomass yield, plant height, tassel branch number, root length and branching, leaf necrosis, seed viability and maturation, anthocyanin and proline content, lignin content, transpiration rate, and stomatal resistance. The encoded protein localises to the tonoplast, mitochondria, vesicle membrane, and ABC transporter complex.