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2017 ; 28
(7
): 858-864
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An intramolecular interaction within the lipid kinase Fab1 regulates cellular
phosphatidylinositol 3,5-bisphosphate lipid levels
#MMPMID28148651
Lang MJ
; Strunk BS
; Azad N
; Petersen JL
; Weisman LS
Mol Biol Cell
2017[Apr]; 28
(7
): 858-864
PMID28148651
show ga
Phosphorylated phosphoinositide lipids (PPIs) are low-abundance signaling
molecules that control signal transduction pathways and are necessary for
cellular homeostasis. The PPI phosphatidylinositol (3,5)-bisphosphate
(PI(3,5)P(2)) is essential in multiple organ systems. PI(3,5)P(2) is generated
from PI3P by the conserved lipid kinase Fab1/PIKfyve. Defects in the dynamic
regulation of PI(3,5)P(2) are linked to human diseases. However, few mechanisms
that regulate PI(3,5)P(2) have been identified. Here we report an intramolecular
interaction between the yeast Fab1 kinase region and an upstream conserved
cysteine-rich (CCR) domain. We identify mutations in the kinase domain that lead
to elevated levels of PI(3,5)P(2) and impair the interaction between the kinase
and CCR domain. We also identify mutations in the CCR domain that lead to
elevated levels of PI(3,5)P(2) Together these findings reveal a regulatory
mechanism that involves the CCR domain of Fab1 and contributes to dynamic control
of cellular PI(3,5)P(2) synthesis.