Purification of time-resolved insulin granules reveals proteomic and lipidomic changes during granule aging.
ARHGAP1
CLIP tag
CP: Cell biology
CP: Metabolism
KIF5b
RAB3a
SNAP tag
granule aging
insulin granule
lipidomics
organelle purification
proteomics
Journal
Cell reports
ISSN: 2211-1247
Titre abrégé: Cell Rep
Pays: United States
ID NLM: 101573691
Informations de publication
Date de publication:
27 Feb 2024
27 Feb 2024
Historique:
received:
05
06
2023
revised:
29
12
2023
accepted:
05
02
2024
medline:
29
2
2024
pubmed:
29
2
2024
entrez:
29
2
2024
Statut:
aheadofprint
Résumé
Endocrine cells employ regulated exocytosis of secretory granules to secrete hormones and neurotransmitters. Secretory granule exocytosis depends on spatiotemporal variables such as proximity to the plasma membrane and age, with newly generated granules being preferentially released. Despite recent advances, we lack a comprehensive view of the molecular composition of insulin granules and associated changes over their lifetime. Here, we report a strategy for the purification of insulin secretory granules of distinct age from insulinoma INS-1 cells. Tagging the granule-resident protein phogrin with a cleavable CLIP tag, we obtain intact fractions of age-distinct granules for proteomic and lipidomic analyses. We find that the lipid composition changes over time, along with the physical properties of the membrane, and that kinesin-1 heavy chain (KIF5b) as well as Ras-related protein 3a (RAB3a) associate preferentially with younger granules. Further, we identify the Rho GTPase-activating protein (ARHGAP1) as a cytosolic factor associated with insulin granules.
Identifiants
pubmed: 38421874
pii: S2211-1247(24)00164-5
doi: 10.1016/j.celrep.2024.113836
pii:
doi:
Types de publication
Journal Article
Langues
eng
Sous-ensembles de citation
IM
Pagination
113836Informations de copyright
Copyright © 2024 The Author(s). Published by Elsevier Inc. All rights reserved.
Déclaration de conflit d'intérêts
Declaration of interests The authors declare no competing interests.