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  • KD/KO Validated

ISG15 Polyclonal antibody

ISG15 Polyclonal Antibody for IF, IHC, WB, ELISA

Host / Isotype

Rabbit / IgG


human, mouse and More (3)





Cat no : 15981-1-AP


G1P2, hUCRP, IFI15, IP17, ISG15, ISG15 ubiquitin like modifier, Ubiquitin like protein ISG15, UCRP

Tested Applications

Positive WB detected inHeLa cells, human brain tissue, A549 cells, MCF-7 cells, PC-3 cells, IFN alpha treated A459 cells, HepG2 cells, IFN alpha treated HepG2 cells
Positive IHC detected inhuman lung cancer tissue, human pancreas cancer tissue
Note: suggested antigen retrieval with TE buffer pH 9.0; (*) Alternatively, antigen retrieval may be performed with citrate buffer pH 6.0
Positive IF detected inmouse brain tissue, HeLa cells

Recommended dilution

Western Blot (WB)WB : 1:1000-1:4000
Immunohistochemistry (IHC)IHC : 1:50-1:500
Immunofluorescence (IF)IF : 1:50-1:500
It is recommended that this reagent should be titrated in each testing system to obtain optimal results.
Sample-dependent, check data in validation data gallery

Product Information

15981-1-AP targets ISG15 in WB, IP, IHC, IF, CoIP, ELISA applications and shows reactivity with human, mouse samples.

Tested Reactivity human, mouse
Cited Reactivityhuman, mouse, goat, monkey, pig
Host / Isotype Rabbit / IgG
Class Polyclonal
Type Antibody
Immunogen ISG15 fusion protein Ag8782
Full Name ISG15 ubiquitin-like modifier
Calculated molecular weight 165 aa, 18 kDa
Observed molecular weight 15-17 kDa
GenBank accession numberBC009507
Gene symbol ISG15
Gene ID (NCBI) 9636
Conjugate Unconjugated
Form Liquid
Purification Method Antigen affinity purification
Storage Buffer PBS with 0.02% sodium azide and 50% glycerol pH 7.3.
Storage ConditionsStore at -20°C. Stable for one year after shipment. Aliquoting is unnecessary for -20oC storage. 20ul sizes contain 0.1% BSA.

Background Information

ISG15 is a ubiquitin-like protein that becomes conjugated to many cellular proteins upon activation by interferon-alpha (IFNA) and -beta (IFNB). ISG15 forms covalent conjugates with its target proteins in a process called ISGylation, which in mammals is known to play a role in antiviral immunity. ISG15 proteins possess two ubiquitin-like (UBL) domains and a highly conserved C-terminal LRGG sequence, the latter being known as the ubiquitin conjugation motif. Intracellular ISG15 are conjugated, via the LRGG motif, to target proteins through a process called ISGylation, which resembles largely ubiquitination, the process of formation of ubiquitin conjugates. Unconjugated extracellular ISG15, which are released from several types of human and murine cells, are known to possess cytokine-like activity.


Product Specific Protocols
WB protocol for ISG15 antibody 15981-1-APDownload protocol
IHC protocol for ISG15 antibody 15981-1-APDownload protocol
IF protocol for ISG15 antibody 15981-1-APDownload protocol
Standard Protocols
Click here to view our Standard Protocols



Signal Transduct Target Ther

TRAF3 activates STING-mediated suppression of EV-A71 and target of viral evasion

Authors - Wenwen Zheng

Nat Commun

Single cell RNA sequencing of human microglia uncovers a subset associated with Alzheimer's disease.

Authors - Marta Olah

Nat Commun

ISGylation controls exosome secretion by promoting lysosomal degradation of MVB proteins.

Authors - Carolina Villarroya-Beltri

J Exp Clin Cancer Res

ISG15 and ISGylation modulates cancer stem cell-like characteristics in promoting tumor growth of anaplastic thyroid carcinoma

Authors - Tong Xu
  • KD Validated
humanWB, IHC, IF

Cancer Res

ISG15 is a critical microenvironmental factor for pancreatic cancer stem cells.

Authors - Bruno Sainz


Ribosome biogenesis restricts innate immune responses to virus infection and DNA.

Authors - Christopher Bianco


The reviews below have been submitted by verified Proteintech customers who received an incentive forproviding their feedback.


Tinne (Verified Customer) (06-27-2023)

This antibody worked really well for detecting an up regulation of ISG15 in IF. Highly recommend!

  • Applications: Immunofluorescence
  • Primary Antibody Dilution: 1:1000
  • Cell Tissue Type: Human hippocampal progenitor cells

Chaohui (Verified Customer) (10-19-2021)

The antibody shows a high quality of free ISG15 and conjugated ISG15 spots

  • Applications: Western Blot
  • Primary Antibody Dilution: 1:1000
  • Cell Tissue Type: HEK293, THP1