Structural highlights
8bgl is a 2 chain structure with sequence from Discosoma sp.. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance.
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| Method: | X-ray diffraction, Resolution 2Å |
| Ligands: | , , , , , |
| Resources: | FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT |
Function
RFP_DISSP Thought to play a role in photoprotection of the coral's resident symbiont microalgae's photosystems from photoinhibition caused by high light levels found near the surface of coral reefs. In deeper water, the fluorescence may be to convert blue light into longer wavelengths more suitable for use in photosynthesis by the microalgal symbionts.[1]
Publication Abstract from PubMed
rsCherryRev1.4 has been reported as one of the reversibly photoswitchable variants of mCherry, and is an improved version with a faster off-switching speed and lower switching fatigue at high light intensities than its precursor rsCherryRev. However, rsCherryRev1.4 still has some limitations such as a tendency to dimerize as well as complex photophysical properties. Here, the crystal structure of rsCherryRev1.4 was determined at a resolution of 2 A and it was discovered that it forms a dimer that shows disulfide bonding between the protomers. Mutagenesis, gel electrophoresis and size-exclusion chromatography strongly implicate Cys24 in this process. Replacing Cys24 in rsCherryRev1.4 resulted in a much lower tendency towards dimerization, while introducing Cys24 into mCherry correspondingly increased its dimerization. In principle, this finding opens the possibility of developing redox sensors based on controlled dimerization via disulfide cross-linking in fluorescent proteins, even though the actual application of engineering such sensors still requires additional research.
An unusual disulfide-linked dimerization in the fluorescent protein rsCherryRev1.4.,Bui TYH, Dedecker P, Van Meervelt L Acta Crystallogr F Struct Biol Commun. 2023 Feb 1;79(Pt 2):38-44. doi: , 10.1107/S2053230X23000572. Epub 2023 Feb 2. PMID:36748340[2]
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.
References
- ↑ Matz MV, Fradkov AF, Labas YA, Savitsky AP, Zaraisky AG, Markelov ML, Lukyanov SA. Fluorescent proteins from nonbioluminescent Anthozoa species. Nat Biotechnol. 1999 Oct;17(10):969-73. PMID:10504696 doi:http://dx.doi.org/10.1038/13657
- ↑ Bui TYH, Dedecker P, Van Meervelt L. An unusual disulfide-linked dimerization in the fluorescent protein rsCherryRev1.4. Acta Crystallogr F Struct Biol Commun. 2023 Feb 1;79(Pt 2):38-44. PMID:36748340 doi:10.1107/S2053230X23000572
