Abstract：
:Cell and organelle membranes consist of a complex mixture of phospholipids (PLs) that determine their size, shape, and function. Phosphatidylcholine (PC) is the most abundant phospholipid in eukaryotic membranes, yet how cells sense and regulate its levels in vivo remains unclear. Here we show that PCYT1A, the rate-limiting enzyme of PC synthesis, is intranuclear and re-locates to the nuclear membrane in response to the need for membrane PL synthesis in yeast, fly, and mammalian cells. By aligning imaging with lipidomic analysis and data-driven modeling, we demonstrate that yeast PCYT1A membrane association correlates with membrane stored curvature elastic stress estimates. Furthermore, this process occurs inside the nucleus, although nuclear localization signal mutants can compensate for the loss of endogenous PCYT1A in yeast and in fly photoreceptors. These data suggest an ancient mechanism by which nucleoplasmic PCYT1A senses surface PL packing defects on the inner nuclear membrane to control PC homeostasis.
journal_name
Dev Celljournal_title
Developmental cellauthors
Haider A,Wei YC,Lim K,Barbosa AD,Liu CH,Weber U,Mlodzik M,Oras K,Collier S,Hussain MM,Dong L,Patel S,Alvarez-Guaita A,Saudek V,Jenkins BJ,Koulman A,Dymond MK,Hardie RC,Siniossoglou S,Savage DBdoi
10.1016/j.devcel.2018.04.012subject
Has Abstractpub_date
2018-05-21 00:00:00pages
481-495.e8issue
4eissn
1534-5807issn
1878-1551pii
S1534-5807(18)30287-9journal_volume
45pub_type
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