GPX6

GPX6 Full Name

glutathione peroxidase 6 (olfactory)

GPX6 Introduction

GPX6, also known as glutathione peroxidase 6, is a member of the glutathione peroxidase family of selenoproteins that is distinguished by its restricted expression in olfactory tissues. The protein is encoded by a gene located on chromosome 6 in humans and contains a selenocysteine residue at its active site, similar to other GPX family members. However, GPX6 exhibits unique structural and functional characteristics that set it apart from other glutathione peroxidases. The protein is predicted to localize to the endoplasmic reticulum and may function as a secreted or membrane-associated protein, although its precise subcellular localization and mechanism of action remain to be fully elucidated. Like other GPX enzymes, GPX6 likely catalyzes the reduction of hydroperoxides using glutathione as a reducing agent, thereby protecting cells from oxidative damage. The enzyme's expression is highly enriched in the olfactory epithelium and olfactory bulb, suggesting a specialized role in olfactory system function and maintenance.

Figure 1. Catalytic cycle of glutathione peroxidases. (Source: Brigelius-Flohé R, et al. 2013)

The physiological significance of GPX6 has been primarily studied in the context of olfactory function and selenoprotein biology. As a selenoprotein, GPX6 requires selenium for its synthesis and activity, linking selenium nutritional status to olfactory health. Studies in animal models have shown that selenium deficiency leads to decreased GPX6 expression and impaired olfactory function, highlighting the importance of this selenoprotein in maintaining olfactory integrity. Additionally, genetic variations in the GPX6 gene have been associated with altered olfactory function in human populations, although the precise mechanisms remain to be determined. Given the importance of olfaction in food recognition, environmental hazard detection, and quality of life, understanding GPX6 function may have implications for treating olfactory dysfunction and related disorders. Future research directions include elucidating the precise enzymatic activity of GPX6, its role in olfactory neuroprotection, and its potential as a biomarker for selenium status and olfactory health.

Alternate Names for GPX6

GPX6; glutathione peroxidase 6 (olfactory); glutathione peroxidase pseudogene 3 , GPXP3; glutathione peroxidase 6; Glutathione peroxidase 6; Glutathione peroxidase-6; gpx-6; GPX6; OTTHUMP00000042350; OTTHUMP00000216813; glutathione peroxidase pseudogene 3

• 1. Pei J, et al. Research progress of glutathione peroxidase family (GPX) in redoxidation. Front Pharmacol. 2023 Mar 2;14:1147414.
  2. Brigelius-Flohé R, et al. Glutathione peroxidases. Biochim Biophys Acta. 2013 May;1830(5):3289-303.