X-ray crystal structure and properties of Phanta, a weakly fluorescent photochromic GFP-like protein

Paul, Craig Don; Traore, Daouda A. K.; Olsen, Seth; Devenish, Rodney J.; Close, Devin W.; Bell, Toby D. M.; Bradbury, Andrew; Wilce, Matthew C. J.; Prescott, Mark

doi:10.1371/journal.pone.0123338

Title: X-ray crystal structure and properties of Phanta, a weakly fluorescent photochromic GFP-like protein

Journal Article · Wed Apr 29 00:00:00 EDT 2015 · PLoS ONE

DOI:https://doi.org/10.1371/journal.pone.0123338· OSTI ID:1188714

Paul, Craig Don ^[1]; Traore, Daouda A. K. ^[2]; Olsen, Seth ^[3]; Devenish, Rodney J. ^[2]; Close, Devin W. ^[4]; Bell, Toby D. M. ^[2]; Bradbury, Andrew ^[4]; Wilce, Matthew C. J. ^[2]; Prescott, Mark ^[2]

Univ. Medicine, Gottingen (Germany)
Monash Univ., Victoria (Australia)
The Univ. of Queensland, Queensland (Australia)
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)

Phanta is a reversibly photoswitching chromoprotein (Φ_F, 0.003), useful for pcFRET, that was isolated from a mutagenesis screen of the bright green fluorescent eCGP123 (Φ_F, 0.8). We have investigated the contribution of substitutions at positions His193, Thr69 and Gln62, individually and in combination, to the optical properties of Phanta. Single amino acid substitutions at position 193 resulted in proteins with very low Φ_F, indicating the importance of this position in controlling the fluorescence efficiency of the variant proteins. The substitution Thr69Val in Phanta was important for supressing the formation of a protonated chromophore species observed in some His193 substituted variants, whereas the substitution Gln62Met did not significantly contribute to the useful optical properties of Phanta. X-ray crystal structures for Phanta (2.3 Å), eCGP123^T69V(2.0 Å) and eCGP123^H193Q (2.2 Å) in their non-photoswitched state were determined, revealing the presence of a cis-coplanar chromophore. We conclude that changes in the hydrogen-bonding network supporting the cis-chromophore, and its contacts with the surrounding protein matrix, are responsible for the low fluorescence emission of eCGP123 variants containing a His193 substitution.

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Research Organization:: Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)

Sponsoring Organization:: USDOE National Nuclear Security Administration (NNSA)

Grant/Contract Number:: AC52-06NA25396

OSTI ID:: 1188714

Journal Information:: PLoS ONE, Vol. 10, Issue 4; ISSN 1932-6203

Publisher:: Public Library of ScienceCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 2 works

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