THF1 is localised to the outer plastid membrane and the stroma. THF1 has a role in sugar signalling [1]. THF1 is also thought to have a role in chloroplast and leaf development. THF1 has been shown to play a crucial role in vesicle-mediated thylakoid membrane biogenesis [2].

1: The plastid protein THYLAKOID FORMATION1 and the plasma membrane G-protein GPA1 interact in a novel sugar-signaling mechanism in Arabidopsis. Huang J, Taylor JP, Chen JG, Uhrig JF, Schnell DJ, Nakagawa T, Korth KL, Jones AM; Plant Cell. 2006;18:1226-1238. PMID:16582010

2: Deletion of the chloroplast-localized Thylakoid formation1 gene product in Arabidopsis leads to deficient thylakoid formation and variegated leaves. Wang Q, Sullivan RW, Kight A, Henry RL, Huang J, Jones AM, Korth KL; Plant Physiol. 2004;136:3594-3604. PMID:15516501