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TitleVisualization of lysosomal membrane proteins by cryo electron tomography.
Journal, issue, pagesNat Commun, Vol. 16, Issue 1, Page 9234, Year 2025
Publish dateOct 17, 2025
AuthorsBridget M McVeigh / José J De Jesús-Pérez / Dirk H Siepe / Prerana Gogoi / Shrawan Kumar Mageswaran / Marian Kalocsay / Elaine M Mihelc / Vera Y Moiseenkova-Bell /
PubMed AbstractLysosomes are essential organelles for cellular homeostasis and signaling, with dysfunction linked to neurological disorders, lysosomal storage diseases, and cancer. While proteomics has advanced our ...Lysosomes are essential organelles for cellular homeostasis and signaling, with dysfunction linked to neurological disorders, lysosomal storage diseases, and cancer. While proteomics has advanced our understanding of lysosomal composition, the structural characterization of lysosomal membrane proteins in their native environment remains a significant challenge. Here, we developed a cryo electron tomography workflow to visualize lysosomal membrane proteins within intact, native lysosomal membranes. We isolated endolysosomes by independently targeting two lysosomal membrane proteins, transient receptor potential mucolipin 1 and transmembrane protein 192, enriching organelles that exhibited the expected morphology and proteomic composition of the endolysosomal system. Sub-tomogram averaging enabled the structural refinement of key membrane and membrane-associated proteins, including V-ATPase, Flotillin, and Clathrin, directly within the lysosomal membrane, revealing their heterogeneous distribution across endolysosomal organelles. By integrating proteomics with structural biology, our workflow establishes a powerful platform for studying lysosomal membrane protein function in health and disease, paving the way for future discoveries in membrane-associated lysosomal mechanisms.
External linksNat Commun / PubMed:41107240 / PubMed Central
MethodsEM (subtomogram averaging)
Resolution13.8 - 26.6 Å
Structure data

EMDB-47080: Sub-tomogram average of the V-ATPase from isolated lysosomes
Method: EM (subtomogram averaging) / Resolution: 24.3 Å

EMDB-47081: Sub-tomogram average of the Flotillin from isolated lysosomes
Method: EM (subtomogram averaging) / Resolution: 13.8 Å

EMDB-49944: Sub-tomogram average of the Clathrin from isolated lysosomes
Method: EM (subtomogram averaging) / Resolution: 26.6 Å

Source
  • Homo sapiens (human)

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