Differential scanning fluorimetric analysis of the amino-acid binding to taste receptor using a model receptor protein, the ligand-binding domain of fish T1r2a/T1r3


Autoři: Takashi Yoshida aff001;  Norihisa Yasui aff001;  Yuko Kusakabe aff002;  Chiaki Ito aff001;  Miki Akamatsu aff003;  Atsuko Yamashita aff001
Působiště autorů: Graduate School of Medicine, Dentistry and Pharmaceutical Sciences, Okayama University, Okayama, Okayama, Japan aff001;  Food Research Institute, National Agriculture and Food Research Organization, Tsukuba, Ibaraki, Japan aff002;  Graduate School of Agriculture, Kyoto University, Kyoto, Kyoto, Japan aff003
Vyšlo v časopise: PLoS ONE 14(10)
Kategorie: Research Article
doi: 10.1371/journal.pone.0218909

Souhrn

Taste receptor type 1 (T1r) is responsible for the perception of essential nutrients, such as sugars and amino acids, and evoking sweet and umami (savory) taste sensations. T1r receptors recognize many of the taste substances at their extracellular ligand-binding domains (LBDs). In order to detect a wide array of taste substances in the environment, T1r receptors often possess broad ligand specificities. However, the entire ranges of chemical spaces and their binding characteristics to any T1rLBDs have not been extensively analyzed. In this study, we exploited the differential scanning fluorimetry (DSF) to medaka T1r2a/T1r3LBD, a current sole T1rLBD heterodimer amenable for recombinant preparation, and analyzed their thermal stabilization by adding various amino acids. The assay showed that the agonist amino acids induced thermal stabilization and shifted the melting temperatures (Tm) of the protein. An agreement between the DSF results and the previous biophysical assay was observed, suggesting that DSF can detect ligand binding at the orthosteric-binding site in T1r2a/T1r3LBD. The assay further demonstrated that most of the tested l-amino acids, but no d-amino acid, induced Tm shifts of T1r2a/T1r3LBD, indicating the broad l-amino acid specificities of the proteins probably with several different manners of recognition. The Tm shifts by each amino acid also showed a fair correlation with the responses exhibited by the full-length receptor, verifying the broad amino-acid binding profiles at the orthosteric site in LBD observed by DSF.

Klíčová slova:

Amino acid analysis – Binding analysis – Fluorescence resonance energy transfer – Glutamate – Melting – Sensory receptors – Taste – G protein coupled receptors


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