Download MendeleyCryo-EM structures reveal the H + /citrate symport mechanism of Drosophila INDY.
Kim, S., Park, J.G., Choi, S.H., Kim, J.W., Jin, M.S.(2025) Life Sci Alliance 8
- PubMed: 39884835
- DOI: https://doi.org/10.26508/lsa.202402992
- Primary Citation of Related Structures:
8ZKW, 8ZKZ, 8ZL1, 8ZL2, 8ZL3, 8ZL4, 8ZL6 - PubMed Abstract:
Drosophila I'm Not Dead Yet (INDY) functions as a transporter for citrate, a key metabolite in the citric acid cycle, across the plasma membrane. Partial deficiency of INDY extends lifespan, akin to the effects of caloric restriction. In this work, we use cryo-electron microscopy to determine structures of INDY in the presence and absence of citrate and in complex with the well-known inhibitor 4,4'-diisothiocyano-2,2'-disulfonic acid stilbene (DIDS) at resolutions ranging from 2.7 to 3.6 Å. Together with functional data obtained in vitro, the INDY structures reveal the H + /citrate co-transport mechanism, in which aromatic residue F119 serves as a one-gate element. They also provide insight into how protein-lipid interactions at the dimerization interface affect the stability and function of the transporter, and how DIDS disrupts the transport cycle.
- School of Life Sciences, Gwangju Institute of Science and Technology (GIST), Gwangju, Republic of Korea.
Organizational Affiliation:
