Engineering a Yellow Thermostable Fluorescent Protein by Rational Design

Matthew R Anderson; Caitlin M Padgett; Cammi J Dargatz; Calysta R Nichols; Keerti R Vittalam; Natasha M DeVore

doi:10.1021/acsomega.2c05005

Engineering a Yellow Thermostable Fluorescent Protein by Rational Design

ACS Omega. 2022 Dec 28;8(1):436-443. doi: 10.1021/acsomega.2c05005. eCollection 2023 Jan 10.

Authors

Matthew R Anderson¹, Caitlin M Padgett¹, Cammi J Dargatz¹, Calysta R Nichols¹, Keerti R Vittalam^{1

2}, Natasha M DeVore¹

Affiliations

¹ Department of Chemistry and Biochemistry, Missouri State University, 901 South National Ave, Springfield, Missouri65897, United States.
² Greenwood Laboratory School, 1024 E. Harrison, Springfield, Missouri65897, United States.

Abstract

Thermal green protein (TGP) is an extremely stable, highly soluble synthetic green fluorescent protein. The quantum yield of TGP is lower than the closest related natural fluorescent protein, monomeric Azami-Green. We improved the thermal recovery of TGP through the introduction of a chromophore mutation, Q66E. Furthermore, we developed a yellow thermal protein (YTP) via mutation of histidine 193 to tyrosine. Incorporation of Q66E into YTP (YTP-E) improved chemostability and pH stability. Both YTP and YTP-E have superior thermostability compared to TGP or TGP-E. These proteins offer a new option for green or yellow fluorescence under harsh chemical or thermal conditions.