4.7 Article

Cryo-EM structures and transport mechanism of human P5B type ATPase ATP13A2

Journal

CELL DISCOVERY
Volume 7, Issue 1, Pages -

Publisher

SPRINGERNATURE
DOI: 10.1038/s41421-021-00334-6

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Funding

  1. National Key R&D Program of China [2017YFA0504600, 2016YFA0501100]
  2. National Science Fund for Distinguished Young Scholars [31625008]
  3. National Natural Science Foundation of China [21532004, 31570733, 81970299]
  4. capital health research and development of special [2020-4-2243]
  5. National Natural Science Foundation [81771188]
  6. Beijing Municipal Natural Science Foundation [5214024]
  7. Postdoctoral Fellowship of Tsinghua-Peking Center for Life Sciences
  8. China Postdoctoral Science Foundation [2017M62075]

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The cryo-EM structures of three distinct intermediates of human ATP13A2 were reported, providing insights into the spermine transport cycle in the lysosome. The transmembrane domain serves as a substrate binding site, and the C-terminal domain is essential for protein stability. These findings advance understanding of the polyamine transport mechanism and associated disease mutants of ATP13A2.
Polyamines are important polycations that play critical roles in mammalian cells. ATP13A2 belongs to the orphan P5B adenosine triphosphatases (ATPase) family and has been established as a lysosomal polyamine exporter to maintain the normal function of lysosomes and mitochondria. Previous studies have reported that several human neurodegenerative disorders are related to mutations in the ATP13A2 gene. However, the transport mechanism of ATP13A2 in the lysosome remains unclear. Here, we report the cryo-electron microscopy (cryo-EM) structures of three distinct intermediates of the human ATP13A2, revealing key insights into the spermine (SPM) transport cycle in the lysosome. The transmembrane domain serves as a substrate binding site and the C-terminal domain is essential for protein stability and may play a regulatory role. These findings advance our understanding of the polyamine transport mechanism, the lipid-associated regulation, and the disease-associated mutants of ATP13A2.

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