Analysis of Phosphoinositide-Binding Properties and Subcellular Localization of GFP-Fusion Proteins

Specific protein-phosphoinositide (PI) interactions are known to play a key role in the targeting of proteins to specific cellular membranes. Investigation of these interactions would be greatly facilitated if GFP-fusion proteins expressed in mammalian cells and used for their subcellular localizati...

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Veröffentlicht in:Lipids 2015-04, Vol.50 (4), p.427-436
Hauptverfasser: Jun, Yong-Woo, Kim, Sangyeol, Kim, Kun-Hyung, Lee, Jin-A, Lim, Chae-Seok, Chang, Iksoo, Suh, Byung-Chang, Kaang, Bong-Kiun, Jang, Deok-Jin
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container_end_page 436
container_issue 4
container_start_page 427
container_title Lipids
container_volume 50
creator Jun, Yong-Woo
Kim, Sangyeol
Kim, Kun-Hyung
Lee, Jin-A
Lim, Chae-Seok
Chang, Iksoo
Suh, Byung-Chang
Kaang, Bong-Kiun
Jang, Deok-Jin
description Specific protein-phosphoinositide (PI) interactions are known to play a key role in the targeting of proteins to specific cellular membranes. Investigation of these interactions would be greatly facilitated if GFP-fusion proteins expressed in mammalian cells and used for their subcellular localization could also be employed for in vitro lipid binding. In this study, we found that lysates of cells overexpressing GFP-fusion proteins could be used for in vitro protein-PI binding assays. We applied this approach to examine the PI-binding properties of Aplysia Sec7 protein (ApSec7) and its isoform ApSec7(VPKIS), in which a VPKIS sequence is inserted into the PH domain of ApSec7. EGFP-ApSec7 but not EGFP-ApSec7(VPKIS) did specifically bind to PI(3,4,5)P 3 in an in vitro lipid-coated bead assay. Overexpression of EGFP-ApSec7 but not EGFP-ApSec7(VPKIS) did induce neurite outgrowth in Aplysia sensory neurons. Structure modeling analysis revealed that the inserted VPKIS caused misfolding around the PI(3,4,5)P 3 -binding pocket of ApSec7 and disturbed the binding of PI(3,4,5)P 3 to the pleckstrin homology (PH) domain. Our data indicate that plasma membrane localization of EGFP-ApSec7 via the interaction between its PH domain and PI(3,4,5)P 3 might play a key role in neurite outgrowth in Aplysia .
doi_str_mv 10.1007/s11745-015-3994-z
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subjects Amino Acid Sequence
Animals
Aplysia - cytology
Aplysia - genetics
Aplysia - metabolism
Aplysia Sec7
Biomedical and Life Sciences
GFP‐fusion protein
Green Fluorescent Proteins - analysis
Green Fluorescent Proteins - genetics
Green Fluorescent Proteins - metabolism
HEK293 Cells
Humans
In vitro protein‐phosphoinositide binding
Life Sciences
Lipidology
Medical Biochemistry
Medicinal Chemistry
Methods
Microbial Genetics and Genomics
Models, Molecular
Molecular Sequence Data
Neurite outgrowth
Neurochemistry
Nutrition
Phosphatidylinositols - metabolism
Phosphoinositide
PI(3,4,5)P3
Protein Binding
Proteins
Recombinant Fusion Proteins - analysis
Recombinant Fusion Proteins - genetics
Recombinant Fusion Proteins - metabolism
title Analysis of Phosphoinositide-Binding Properties and Subcellular Localization of GFP-Fusion Proteins
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