Ecto-NOX disulfide-thiol exchanger 2 (ENOX2) (ENOX2)

Ecto-NOX disulfide-thiol exchanger 2 (ENOX2), also known as tNOX, is a tumor-specific cell surface protein that belongs to the ECTO-NOX family of oxidoreductases (UniProt Q16206) [1]. It is uniquely expressed on the outer surface of the plasma membrane of cancer cells and is generally absent from the surface of non-transformed cells (Morré & Morré, 2013) [2]. ENOX2 exhibits dual enzymatic activities: it functions as a hydroquinone (NADH) oxidase and a protein disulfide-thiol exchanger, both of which are essential for the physical process of cell enlargement and growth (PubMed: 12164532) [3]. By facilitating plasma membrane electron transport, ENOX2 helps maintain the redox state required for cancer cell proliferation and survival (NCBI Gene: 10473) [4]. Because of its specific expression in malignant tissues and its presence in the sera of cancer patients, ENOX2 serves as both a promising therapeutic target and a diagnostic biomarker for early-stage cancer detection (Morré & Morré, 2013) [2]. Therapeutic strategies often involve small molecule inhibitors like phenoxodiol or natural compounds like epigallocatechin-3-gallate (EGCg), which trigger apoptosis by disrupting the protein's enzymatic cycles (PubMed: 12164532) [3].

Other names

tNOXTumor-associated hydroquinone oxidaseAPK1 antigenCOVA1

Inhibition of the hydroquinone (NADH) oxidase and protein disulfide-thiol exchanger activities, which disrupts the plasma membrane electron transport system required for cell enlargement and induces apoptosis in cancer cells.