Rabbit anti-Human USP18 Polyclonal Antibody

Uniprot Id

Q9UMW8

Target Species

Human

Target Name

USP18

Target Full Name

Ubl carboxyl-terminal hydrolase 18

Target Function

Involved in the negative regulation of the inflammatory response triggered by type I interferon. Upon recruitment by STAT2 to the type I IFN receptor subunit IFNAR2 interferes with the assembly of the ternary interferon-IFNAR1-IFNAR2 complex and acts as a negative regulator of the type I IFN signaling pathway. Also regulates protein ISGylation. Can efficiently cleave only ISG15 fusions including native ISG15 conjugates linked via isopeptide bonds. Necessary to maintain a critical cellular balance of ISG15-conjugated proteins in both healthy and stressed organisms.; Has enzymatic activity similar to isoform 1 and interferes with type I interferon signaling. Major deISGylation enzyme for nuclear proteins.

Target Involvement

Pseudo-TORCH syndrome 2 (PTORCH2)

Target Subcellular Location

[Isoform 1]: Cytoplasm.; [Isoform 2]: Nucleus. Cytoplasm.

Target Protein Families

Peptidase C19 family

Target Research Area

Cell Biology

Target Synonyms

43 kDa ISG15 specific protease; 43 kDa ISG15-specific protease; EC 3.1.2.; hUBP43; Interferon Stimulated Gene 43 kD; ISG15 Specific Processing Protease; ISG15-specific-processing protease; ISG43; Ubiquitin Specific Peptidase 18; Ubiquitin Specific Protease 18 43 kD; Ubiquitin Specific Protease 18; Ubl carboxyl terminal hydrolase 18; Ubl carboxyl-terminal hydrolase 18; Ubl thioesterase 18; Ubl thiolesterase 18; Ubp15; UBP18_HUMAN; USP18

Target Background

The protein encoded by this gene belongs to the ubiquitin-specific proteases (UBP) family of enzymes that cleave ubiquitin from ubiquitinated protein substrates. It is highly expressed in liver and thymus, and is localized to the nucleus. This protein efficiently cleaves only ISG15 (a ubiquitin-like protein) fusions, and deletion of this gene in mice results in a massive increase of ISG15 conjugates in tissues, indicating that this protein is a major ISG15-specific protease. Mice lacking this gene are also hypersensitive to interferon, suggesting a function of this protein in downregulating interferon responses, independent of its isopeptidase activity towards ISG15.