Structure of a NADPH-dependent blue fluorescent protein revealed the unique role of Gly176 on the fluorescence enhancement

Tzu Huei Kao, Yeh Chen, Chien Hua Pai, Ming Chung Chang, Andrew H.J. Wang

Research output: Contribution to journalArticlepeer-review

12 Citations (Scopus)


A NADPH-dependent blue fluorescent protein from Vibrio vulnificus CKM-1 (BFPvv) emits blue fluorescence under UV-exposure. Previously, the BFPvvD7 mutant generated by directed evolution displayed a fourfold enhancement in fluorescent intensity. Herein, a further increase in fluorescence in the new BFPvvD8 mutant, with three additional mutations from BFPvvD7, was made. To understand the underlying mechanism of the increased fluorescent intensity of BFPvv, we solved the BFPvvD8-NADPH complex structure. Accompanied with lifetime detection, we proposed that the enhanced intensity is related to the conformational change caused by a glycine residue (Gly176) mutated to other non-glycine residues at a turn close to the NADPH binding site. We also observed the Furster resonance energy transfer (FRET) from our BFPvvD8 to each of the GFP-like fluorescent proteins, mTFP1 and EGFP, joined by an eight-residue linker between the N-terminal of BFPvvD8 and the C-terminal of GFPs. Taken together, with the newly solved BFPvvD8 structure, our results not only provide new considerations within the rational-based protein engineering of this NADPH-dependent BFP, but also suggest that BFPvvD8 could be a potential candidate in FRET-based biosensor techniques.

Original languageEnglish
Pages (from-to)485-493
Number of pages9
JournalJournal of Structural Biology
Issue number3
Publication statusPublished - Jun 2011
Externally publishedYes


  • Blue fluorescent protein
  • Förster resonance energy transfer
  • NADPH-dependent fluorescent protein
  • Short-chain dehydrogenase/reductase
  • X-ray crystallography

ASJC Scopus subject areas

  • Structural Biology


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