9bgz

From Proteopedia

Ancestral uncoupled aspartate transporter, apo conditions, high-affinity state

Structural highlights

9bgz is a 1 chain structure with sequence from Synthetic construct. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance.
Method:	Electron Microscopy, Resolution 3Å
Resources:	FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT

Publication Abstract from PubMed

Secondary active membrane transporters harness the energy of ion gradients to concentrate their substrates. Homologous transporters evolved to couple transport to different ions in response to changing environments and needs. The bases of such diversification, and thus principles of ion coupling, are unexplored. Employing phylogenetics and ancestral protein reconstruction, we investigated sodium-coupled transport in prokaryotic glutamate transporters, a mechanism ubiquitous across life domains and critical to neurotransmitter recycling in humans. We found that the evolutionary transition from sodium-dependent to independent substrate binding to the transporter preceded changes in the coupling mechanism. Structural and functional experiments suggest that the transition entailed allosteric mutations, making sodium binding dispensable without affecting ion-binding sites. Allosteric tuning of transporters' energy landscapes might be a widespread route of their functional diversification.

Evolutionary analysis reveals the origin of sodium coupling in glutamate transporters.,Reddy KD, Rasool B, Akher FB, Kutlesic N, Pant S, Boudker O bioRxiv [Preprint]. 2024 Apr 25:2023.12.03.569786. doi: , 10.1101/2023.12.03.569786. PMID:38106174^[1]

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

References

↑ Reddy KD, Rasool B, Akher FB, Kutlešić N, Pant S, Boudker O. Evolutionary analysis reveals the origin of sodium coupling in glutamate transporters. bioRxiv [Preprint]. 2024 Apr 25:2023.12.03.569786. PMID:38106174 doi:10.1101/2023.12.03.569786