Abstract
Cyanobacteriochromes are a structurally and spectrally highly diverse class of phytochrome-related photosensory biliproteins. They contain one or more GAF domains that bind phycocyanobilin (PCB) autocatalytically; some of these proteins are also capable of further modifying PCB to phycoviolobilin or rubins. We tested the chromophorylation with the non-photochromic phycoerythrobilin (PEB) of 16 cyanobacteriochrome GAFs from Nostoc sp. PCC 7120, of Slr1393 from Synechocystis sp. PCC 6803, and of Tlr0911 from Thermosynechococcus elongatus BP-1. Nine GAFs could be autocatalytically chromophorylated in vivo/in E. coli with PEB, resulting in highly fluorescent biliproteins with brightness comparable to that of fluorescent proteins like GFP. In several GAFs, PEB was concomitantly converted to phycourobilin (PUB) during binding. This not only shifted the spectra, but also increased the Stokes shift. The chromophorylated GAFs could be oligomerized further by attaching a GCN4 leucine zipper domain, thereby enhancing the absorbance and fluorescence of the complexes. The presence of both PEB and PUB makes these oligomeric GAF-“bundles” interesting models for energy transfer akin to the antenna complexes found in cyanobacterial phycobilisomes. The thermal and photochemical stability and their strong brightness make these constructs promising orange fluorescent biomarkers.
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Abbreviations
- CBCR:
-
Cyanobacteriochrome
- GAF:
-
Acronym of cGMP phosphodiesterase, adenylyl cyclase and FhlA protein domain (SMART acc. no. SM00065)
- GFP:
-
Green fluorescent protein
- HO1:
-
Heme oxygenase 1
- KPB:
-
Potassium phosphate buffer
- Nostoc:
-
Anabaena (Nostoc) sp. PCC 7120
- PCB:
-
Phycocyanobilin
- PEB:
-
Phycoerythrobilin
- PebS:
-
PEB synthase
- PUB:
-
Phycourobilin
- PVB:
-
Phycoviolobilin
- Phy:
-
Phytochrome
- RGS:
-
Red-green switchable protein encoded by rgs = slr1393.
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Sun, YF., Xu, JG., Tang, K. et al. Orange fluorescent proteins constructed from cyanobacteriochromes chromophorylated with phycoerythrobilin. Photochem Photobiol Sci 13, 757–763 (2014). https://doi.org/10.1039/c3pp50411e
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DOI: https://doi.org/10.1039/c3pp50411e