4EN1

The 1.62A structure of a FRET-optimized Cerulean Fluorescent Protein

4EN1 の概要

• エントリーDOI: 10.2210/pdb4en1/pdb
• 分子名称: Green fluorescent protein, GLYCEROL, DI(HYDROXYETHYL)ETHER, ... (6 entities in total)
• 機能のキーワード: gfp-like beta-barrel, fluorescent protein
• 由来する生物種: Aequorea victoria (Jellyfish)
• タンパク質・核酸の鎖数: 2
• 化学式量合計: 60573.28

構造登録者

Watkins, J.L. (登録日: 2012-04-12, 公開日: 2013-04-24, 最終更新日: 2024-10-09)

主引用文献

Watkins, J.L.,Kim, H.,Markwardt, M.L.,Chen, L.,Fromme, R.,Rizzo, M.A.,Wachter, R.M.
The 1.6 A resolution structure of a FRET-optimized Cerulean fluorescent protein.
Acta Crystallogr.,Sect.D, 69:767-773, 2013

PubMed Abstract: Genetically encoded cyan fluorescent proteins (CFPs) bearing a tryptophan-derived chromophore are commonly used as energy-donor probes in Förster resonance energy transfer (FRET) experiments useful in live cell-imaging applications. In recent years, significant effort has been expended on eliminating the structural and excited-state heterogeneity of these proteins, which has been linked to undesirable photophysical properties. Recently, mCerulean3, a descendant of enhanced CFP, was introduced as an optimized FRET donor protein with a superior quantum yield of 0.87. Here, the 1.6 Å resolution X-ray structure of mCerulean3 is reported. The chromophore is shown to adopt a planar trans configuration at low pH values, indicating that the acid-induced isomerization of Cerulean has been eliminated. β-Strand 7 appears to be well ordered in a single conformation, indicating a loss of conformational heterogeneity in the vicinity of the chromophore. Although the side chains of Ile146 and Leu167 appear to exist in two rotamer states, they are found to be well packed against the indole group of the chromophore. The Ser65 reversion mutation allows improved side-chain packing of Leu220. A structural comparison with mTurquoise2 is presented and additional engineering strategies are discussed.

PubMed: 23633585
DOI: 10.1107/S0907444913001546

実験手法

X-RAY DIFFRACTION (1.62 Å)