Dimer opening of the nucleotide binding domains of ABC transporters after ATP hydrolysis

68Citations
Citations of this article
75Readers
Mendeley users who have this article in their library.

This article is free to access.

Abstract

ABC transporters constitute one of the most abundant membrane transporter families. The most common feature shared in the family is the highly conserved nucleotide binding domains (NBDs) that drive the transport process through binding and hydrolysis of ATP. Molecular dynamics simulations are used to investigate the effect of ATP hydrolysis in the NBDs. Starting with the ATP-bound, closed dimer of MalK, four simulation systems with all possible combinations of ATP or ADP-Pi bound to the two nucleotide binding sites are constructed and simulated with equilibrium molecular dynamics for ∼70 ns each. The results suggest that the closed form of the NBD dimer can only be maintained with two bound ATP molecules; in other words, hydrolysis of one ATP can lead to the opening of the dimer interface of the NBD dimer. Furthermore, we observed that the opening is an immediate effect of hydrolysis of ATP into ADP and Pi rather than the dissociation of hydrolysis products. In addition, the opening is mechanistically triggered by the dissociation of the LSGGQ motif from the bound nucleotide. A metastable ADP-Pi bound conformational state is consistently observed before the dimer opening in all the simulation systems. © 2008 by the Biophysical Society.

Cite

CITATION STYLE

APA

Wen, P. C., & Tajkhorshid, E. (2008). Dimer opening of the nucleotide binding domains of ABC transporters after ATP hydrolysis. Biophysical Journal, 95(11), 5100–5110. https://doi.org/10.1529/biophysj.108.139444

Register to see more suggestions

Mendeley helps you to discover research relevant for your work.

Already have an account?

Save time finding and organizing research with Mendeley

Sign up for free