Download MendeleyThe solution structure of a transient photoreceptor intermediate: delta25 photoactive yellow protein
Bernard, C., Houben, K., Derix, N.M., Marks, D., van der Horst, M.A., Hellingwerf, K.J., Boelens, R., Kaptein, R., van Nuland, N.A.(2005) Structure 13: 953-962
- PubMed: 16004868
- DOI: https://doi.org/10.1016/j.str.2005.04.017
- Primary Citation of Related Structures:
1XFN, 1XFQ - PubMed Abstract:
The N-terminally truncated variant of photoactive yellow protein (Delta25-PYP) undergoes a very similar photocycle as the corresponding wild-type protein (WT-PYP), although the lifetime of its light-illuminated (pB) state is much longer. This has allowed determination of the structure of both its dark- (pG) as well as its pB-state in solution by nuclear magnetic resonance (NMR) spectroscopy. The pG structure shows a well-defined fold, similar to WT-PYP and the X-ray structure of the pG state of Delta25-PYP. In the long-lived photocycle intermediate pB, the central beta sheet is still intact, as well as a small part of one alpha helix. The remainder of pB is unfolded and highly flexible, as evidenced by results from proton-deuterium exchange and NMR relaxation studies. Thus, the partially unfolded nature of the presumed signaling state of PYP in solution, as suggested previously, has now been structurally demonstrated.
Organizational Affiliation:
Department of NMR Spectroscopy, Bijvoet Center for Biomolecular Research, Utrecht University, Padualaan 8, 3584 CH Utrecht, The Netherlands.
