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3dqn

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Structure of the Yellow Fluorescent Protein Citrine Frozen at 500 Atmospheres: Structure 3 in a Series of 26 High Pressure Structures

Structural highlights

3dqn is a 1 chain structure with sequence from Aequorea victoria. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance.
Method:	X-ray diffraction, Resolution 1.44Å
Ligands:
Resources:	FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT

Function

GFP_AEQVI Energy-transfer acceptor. Its role is to transduce the blue chemiluminescence of the protein aequorin into green fluorescent light by energy transfer. Fluoresces in vivo upon receiving energy from the Ca(2+)-activated photoprotein aequorin.

Evolutionary Conservation

Check, as determined by ConSurfDB. You may read the explanation of the method and the full data available from ConSurf.

Publication Abstract from PubMed

A protein molecule is an intricate system whose function is highly sensitive to small external perturbations. However, no examples that correlate protein function with progressive subangstrom structural perturbations have thus far been presented. To elucidate this relationship, we have investigated a fluorescent protein, citrine, as a model system under high-pressure perturbation. The protein has been compressed to produce deformations of its chromophore by applying a high-pressure cryocooling technique. A closely spaced series of x-ray crystallographic structures reveals that the chromophore undergoes a progressive deformation of up to 0.8 A at an applied pressure of 500 MPa. It is experimentally demonstrated that the structural motion is directly correlated with the progressive fluorescence shift of citrine from yellow to green under these conditions. This protein is therefore highly sensitive to subangstrom deformations and its function must be understood at the subangstrom level. These results have significant implications for protein function prediction and biomolecule design and engineering, because they suggest methods to tune protein function by modification of the protein scaffold.

Alteration of citrine structure by hydrostatic pressure explains the accompanying spectral shift.,Barstow B, Ando N, Kim CU, Gruner SM Proc Natl Acad Sci U S A. 2008 Sep 9;105(36):13362-6. Epub 2008 Sep 3. PMID:18768811^[1]

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

References

↑ Barstow B, Ando N, Kim CU, Gruner SM. Alteration of citrine structure by hydrostatic pressure explains the accompanying spectral shift. Proc Natl Acad Sci U S A. 2008 Sep 9;105(36):13362-6. Epub 2008 Sep 3. PMID:18768811