Anti-Selenium Binding Protein 1 antibodies are used in the immunodetection of the protein encoded by the SELENBP1 gene. In humans, the canonical protein has a reported length of 472 amino acid residues and a mass of 52.4 kDa. Its subcellular localization is in the membrane, nucleus, and cytoplasm. Alternative splicing is reported to yield 4 different isoforms for this protein. It is widely expressed across many tissue types. A member of the Selenium-binding protein family, it is known to catalyze the oxidation of methanethiol, an organosulfur compound known to be produced in substantial amounts by gut bacteria. Post-translational modifications have been described, including phosphorylation. Other names for this target antigen include HEL-S-134P, LPSB, MTO, SBP56, SP56, hSBP, methanethiol oxidase, and EHMTO.