FKBP14is an essential gene that regulates Presenilin protein levels and Notch signaling inDrosophila

Abstract

SUMMARYPresenilins were identified as causative factors in familial Alzheimer's disease and also play an essential role in Notch signaling during development. We previously identified FKBP14, a member of the family of FK506-binding proteins (FKBPs), as a modifier of Presenilin in Drosophila. FKBPs are highly conserved peptidyl-prolyl cis-trans isomerases that play integral roles in protein folding, assembly and trafficking. Although FKBPs have been implicated in a broad range of biological processes, they are non-essential in yeast and their role in the development of multicellular organisms remains unclear. We show that FKBP14 is an essential gene in Drosophila and that loss of FKBP14 gives rise to specific defects in eye, bristle and wing development. FKBP14 mutants genetically interact with components of the Notch pathway, indicating that these phenotypes are associated, at least in part, with dysregulation of Notch signaling. We show that whereas Notch trafficking to the membrane is unaffected in FKBP14 mutants, levels of Notch target genes are reduced, suggesting that FKBP14 acts downstream of Notch activation at the membrane. Consistent with this model, we find that Presenilin protein levels and -secretase activity are reduced in FKBP14 null mutants. Altogether, our data demonstrate that FKBP14 plays an essential role in development, one aspect of which includes regulating members of the Notch signaling pathway.

Downregulation of FKBP14 by RNA interference inhibits the proliferation, adhesion and invasion of gastric cancer cells

“…FKBP14 is an important regulator for the development of Drosophila (16) and its mutation is associated with a variant of Ehlers-Danlos syndrome (17,18). FKBP14 belongs to the FKBP family, which perform important biological functions in the cell.…”

The Ubiquitin-Proteasome System and Molecular Chaperone Deregulation in Alzheimer’s Disease

“…Whereas other FKBPs are commonly found in the cytoplasm, FKBP14 is located in the ER [318]. FKBP14 plays an important role in Notch signaling in Drosophila and may control γ-secretase activity via the regulation of presenilin, which thereby affects Notch cleavage [319].…”

A Substrate Preference for the Rough Endoplasmic Reticulum Resident Protein FKBP22 during Collagen Biosynthesis

“…The two EF-hand motifs are missing, but it has the dimerization domain in the amino-terminal region (42). The lack of FKBP22 in Drosophila leads to embryonic lethality and may be involved in the Notch signaling pathway (43). Recently, FKBP22 was reported to be possibly involved in collagen biosynthesis in mammals.…”