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Yamamoto-Hino, M., Katsumata, E., Suzuki, E., Maeda, Y., Kinoshita, T., Goto, S. (2018). Nuclear envelope localization of PIG-B is essential for GPI-anchor synthesis in Drosophila.  J. Cell Sci. 131(20): jcs218024.
FlyBase ID
FBrf0240437
Publication Type
Research paper
Abstract

Membrane lipid biosynthesis is a complex process that takes place in various intracellular compartments. Glycosylphosphatidylinositol (GPI), a lipid involved in membrane anchoring of some proteins, is synthesized by the PIG enzymes. Most PIGs are localized to the endoplasmic reticulum (ER), but Drosophila PIG-B (DmPIG-B) is localized to the nuclear envelope (NE). To determine whether the NE localization of DmPIG-B is functionally important, we defined the determinants of localization and generated an ER-localized form, denoted DmPIG-BER. The enzymatic activity of DmPIG-BER was comparable to that of NE-localized DmPIG-BNE. Expression of DmPIG-BER inefficiently rescued the lethality of the PIG-B mutant, whereas DmPIG-BNE rescued this lethality fully. DmPIG-BER was preferentially degraded by lysosomes, suggesting that the NE localization is essential for function and stability of the protein. In addition, we found that the region of the ER proximal to the NE is the site of translation of GPI-anchored proteins and addition of GPI. Thus, the NE and proximal ER may provide a platform for efficient GPI anchoring.

PubMed ID
PubMed Central ID
PMC6215393 (PMC) (EuropePMC)
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    Language of Publication
    English
    Additional Languages of Abstract
    Parent Publication
    Publication Type
    Journal
    Abbreviation
    J. Cell Sci.
    Title
    Journal of Cell Science
    Publication Year
    1966-
    ISBN/ISSN
    0021-9533
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