Structure and transport mechanism of P5B-ATPases

Ping Li, Kaituo Wang, Nina Salustros, Christina Grønberg and Pontus Gourdon ()
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Ping Li: Lund University
Kaituo Wang: University of Copenhagen
Nina Salustros: University of Copenhagen
Christina Grønberg: University of Copenhagen
Pontus Gourdon: Lund University

Nature Communications, 2021, vol. 12, issue 1, 1-8

Abstract: Abstract In human cells, P5B-ATPases execute the active export of physiologically important polyamines such as spermine from lysosomes to the cytosol, a function linked to a palette of disorders. Yet, the overall shape of P5B-ATPases and the mechanisms of polyamine recognition, uptake and transport remain elusive. Here we describe a series of cryo-electron microscopy structures of a yeast homolog of human ATP13A2-5, Ypk9, determined at resolutions reaching 3.4 Å, and depicting three separate transport cycle intermediates, including spermine-bound conformations. Surprisingly, in the absence of cargo, Ypk9 rests in a phosphorylated conformation auto-inhibited by the N-terminus. Spermine uptake is accomplished through an electronegative cleft lined by transmembrane segments 2, 4 and 6. Despite the dramatically different nature of the transported cargo, these findings pinpoint shared principles of transport and regulation among the evolutionary related P4-, P5A- and P5B-ATPases. The data also provide a framework for analysis of associated maladies, such as Parkinson’s disease.

Date: 2021
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DOI: 10.1038/s41467-021-24148-y

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