What is it about?

We report here the X-ray structures of the intact NowGFP at pH 9.0 and pH 4.8, and of its photoconverted variant, NowGFP_conv, at 1.35, 1.18, and 2.5Å resolution, respectively. The structure of NowGFP at pH 9.0 suggests the anionic state of Trp66 of the chromophore to be the primary cause of its green fluorescence. At both examined pH, Trp66 predominantly adopts cis conformation; only ~20% of trans conformation was observed at pH 4.8. It was shown that Lys61 is a key residue, playing a central role in the chromophore indole ring ionization.

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Why is it important?

New type of chromophores,


We hope this paper will initiate the experiments on design new gene engineered biomarkers with Trp based chromophores.

Vladimir Pletnev

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This page is a summary of: Structure of the green fluorescent protein NowGFP with an anionic tryptophan-based chromophore, Acta Crystallographica Section D Biological Crystallography, July 2015, International Union of Crystallography,
DOI: 10.1107/s1399004715010159.
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