Download MendeleyAmino acid residue at the 165th position tunes EYFP chromophore maturation. A structure-based design.
Pletneva, N.V., Maksimov, E.G., Protasova, E.A., Mamontova, A.V., Simonyan, T.R., Ziganshin, R.H., Lukyanov, K.A., Muslinkina, L., Pletnev, S., Bogdanov, A.M., Pletnev, V.Z.(2021) Comput Struct Biotechnol J 19: 2950-2959
- PubMed: 34136094
- DOI: https://doi.org/10.1016/j.csbj.2021.05.017
- Primary Citation of Related Structures:
6ZQO - PubMed Abstract:
For the whole GFP family, a few cases, when a single mutation in the chromophore environment strongly inhibits maturation, were described. Here we study EYFP-F165G - a variant of the enhanced yellow fluorescent protein - obtained by a single F165G replacement, and demonstrated multiple fluorescent states represented by the minor emission peaks in blue and yellow ranges (~470 and ~530 nm), and the major peak at ~330 nm. The latter has been assigned to tryptophan fluorescence, quenched due to excitation energy transfer to the mature chromophore in the parental EYFP protein. EYFP-F165G crystal structure revealed two general independent routes of post-translational chemistry, resulting in two main states of the polypeptide chain with the intact chromophore forming triad (~85%) and mature chromophore (~15%). Our experiments thus highlighted important stereochemical role of the 165th position strongly affecting spectral characteristics of the protein. On the basis of the determined EYFP-F165G three-dimensional structure, new variants with ~ 2-fold improved brightness were engineered.
Organizational Affiliation:
Shemyakin-Ovchinnikov Institute of Bioorganic Chemistry, Moscow 117997, Russia.
