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8zus

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Crystal structure of the F99S/M153T/V163A/T203V variant of GFP at pH 7.5

Structural highlights

8zus 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 1.2Å
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.

Publication Abstract from PubMed

Green fluorescent protein (GFP) is widely utilized as a fluorescent tag in biochemical fields. Whereas the intermediate (I) state has been proposed in the photoreaction cycle in addition to the A and B states, until now the structure of I has only been estimated by computational studies. In this paper, we report the crystal structures of the I stabilizing variants of GFP at high resolutions where respective atoms can be observed separately. Comparison with the structures in the other states highlights the structural feature of the I state. The side chain of one of the substituted residues, Val203, adopts the gauche- conformation observed for Thr203 in the A state, which is different from the B state. On the other hand, His148 interacts with the chromophore by ordinary hydrogen bonding with a distance of 2.85 A, while the weaker interaction by longer distances is observed in the A state. Therefore, it was indicated that it is possible to distinguish three states A, B and I by the two hydrogen bond distances Ogamma-Thr203...Oeta-chromophore and Ndelta1-His148...Oeta-chromophore. We discuss the characteristics of the I intermediate of wild-type GFP on the bases of the structure estimated from the variant structures by quantum chemical calculations.

Structural characterization of green fluorescent protein in the I-state.,Takeda R, Tsutsumi E, Okatsu K, Fukai S, Takeda K Sci Rep. 2024 Oct 1;14(1):22832. doi: 10.1038/s41598-024-73696-y. PMID:39353998^[1]

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

References

↑ Takeda R, Tsutsumi E, Okatsu K, Fukai S, Takeda K. Structural characterization of green fluorescent protein in the I-state. Sci Rep. 2024 Oct 1;14(1):22832. PMID:39353998 doi:10.1038/s41598-024-73696-y