8QLL
Crystal structure of rat glutathione transferase Omega 1 bound to glutathione
Summary for 8QLL
| Entry DOI | 10.2210/pdb8qll/pdb |
| Descriptor | Glutathione S-transferase omega-1, GLUTATHIONE (3 entities in total) |
| Functional Keywords | glutathione transferase omega, thiol-transferase, ligandin, transferase |
| Biological source | Rattus norvegicus (Norway rat) |
| Total number of polymer chains | 2 |
| Total formula weight | 57682.29 |
| Authors | |
| Primary citation | Poirier, N.,Menetrier, F.,Moreno, J.,Boichot, V.,Heydel, J.M.,Didierjean, C.,Canivenc-Lavier, M.C.,Canon, F.,Neiers, F.,Schwartz, M. Rattus norvegicus Glutathione Transferase Omega 1 Localization in Oral Tissues and Interactions with Food Phytochemicals. J.Agric.Food Chem., 72:5887-5897, 2024 Cited by PubMed Abstract: Glutathione transferases are xenobiotic-metabolizing enzymes with both glutathione-conjugation and ligandin roles. GSTs are present in chemosensory tissues and fluids of the nasal/oral cavities where they protect tissues from exogenous compounds, including food molecules. In the present study, we explored the presence of the omega-class glutathione transferase (GSTO1) in the rat oral cavity. Using immunohistochemistry, GSTO1 expression was found in taste bud cells of the tongue epithelium and buccal cells of the oral epithelium. Buccal and lingual extracts exhibited thiol-transferase activity (4.9 ± 0.1 and 1.8 ± 0.1 μM/s/mg, respectively). A slight reduction from 4.9 ± 0.1 to 4.2 ± 0.1 μM/s/mg ( < 0.05; Student's test) was observed in the buccal extract with 100 μM GSTO1-IN-1, a specific inhibitor of GSTO1. RnGSTO1 exhibited the usual activities of omega GSTs, .., thiol-transferase (catalytic efficiency of 8.9 × 10 M·s), and phenacyl-glutathione reductase (catalytic efficiency of 8.9 × 10 M·s) activities, similar to human GSTO1. RnGSTO1 interacts with food phytochemicals, including bitter compounds such as luteolin (K = 3.3 ± 1.9 μM). Crystal structure analysis suggests that luteolin most probably binds to RnGSTO1 ligandin site. Our results suggest that GSTO1 could interact with food phytochemicals in the oral cavity. PubMed: 38441878DOI: 10.1021/acs.jafc.4c00483 PDB entries with the same primary citation |
| Experimental method | X-RAY DIFFRACTION (2.4 Å) |
Structure validation
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