A Proposed Time-Resolved X-Ray Scattering Approach to Track Localand Global Conformational Changes in Membrane Transport Proteins
2008 (English)In: Structure, ISSN 0969-2126, E-ISSN 1878-4186, Vol. 16, 21-28 p.Article in journal (Refereed) Published
Time-resolved X-ray scattering has emerged as a powerful technique for studying the rapid structural dynamics of small molecules in solution. Membrane-protein-catalyzed transport processes frequently couple large-scale conformational changes of the transporter with local structural changes perturbing the uptake and release of the transported substrate. Using light-driven halide ion transport catalyzed by halorhodopsin as a model system, we combine molecular dynamics simulations with X-ray scattering calculations to demonstrate how small-molecule time-resolved X-ray scattering can be extended to the study of membrane transport processes. In particular, by introducing strongly scattering atoms to label specific positions within the protein and substrate, the technique of time-resolved wide-angle X-ray scattering can reveal both local and global conformational changes. This approach simultaneously enables the direct visualization of global rearrangements and substrate movement, crucial concepts that underpin the alternating access paradigm for membrane transport proteins.
Place, publisher, year, edition, pages
2008. Vol. 16, 21-28 p.
Computer and Information Science
IdentifiersURN: urn:nbn:se:kth:diva-75451DOI: 10.1016/j.str.2007.10.016ISI: 000252286700008OAI: oai:DiVA.org:kth-75451DiVA: diva2:490495
QC 201202102012-02-052012-02-052012-02-10Bibliographically approved