Download MendeleyStructural basis for reversible photobleaching of a green fluorescent protein homologue.
Henderson, J.N., Ai, H.W., Campbell, R.E., Remington, S.J.(2007) Proc Natl Acad Sci U S A 104: 6672-6677
- PubMed: 17420458
- DOI: https://doi.org/10.1073/pnas.0700059104
- Primary Citation of Related Structures:
2OTB, 2OTE - PubMed Abstract:
Fluorescent protein (FP) variants that can be reversibly converted between fluorescent and nonfluorescent states have proven to be a catalyst for innovation in the field of fluorescence microscopy. However, the structural basis of the process remains poorly understood. High-resolution structures of a FP derived from Clavularia in both the fluorescent and the light-induced nonfluorescent states reveal that the rapid and complete loss of fluorescence observed upon illumination with 450-nm light results from cis-trans isomerization of the chromophore. The photoinduced change in configuration from the well ordered cis isomer to the highly nonplanar and disordered trans isomer is accompanied by a dramatic rearrangement of internal side chains. Taken together, the structures provide an explanation for the loss of fluorescence upon illumination, the slow light-independent recovery, and the rapid light-induced recovery of fluorescence. The fundamental mechanism appears to be common to all of the photoactivatable and reversibly photoswitchable FPs reported to date.
Organizational Affiliation:
Departments of Chemistry and Physics, and Institute of Molecular Biology, University of Oregon, Eugene, OR 97403, USA.
