Structure and function of the Arabidopsis ABC transporter ABCB19 in brassinosteroid export.

The article focuses on the role of Arabidopsis ABC transporter ABCB19 in exporting brassinosteroids, vital for plant growth and stress response. Topics discussed include ABCB19's ATPase activity stimulated by brassinosteroids, its binding affinities, transport mechanisms, structural analyses, and its positive regulation of brassinosteroid signaling alongside ABCB1, shedding light on molecular architecture and signaling cross-talk in plants.