What is the identity of the extra band detected in THP-1 extract by your STING (D2P2F) Rabbit mAb #13647?

We observe multiple bands at or around 33-35 kDa in cells with high STING protein expression, such as THP-1 and HDLM-2. Regrettably, we are not certain about what the lower molecular weight band represents in the THP-1 extract. However, customers may be interested in the following possibilities:

1) Please see Wang, P. et al. (2018) Nucleic Acids Res. 46, 4054-4071 (PMID: 29547894; https://pubmed.ncbi.nlm.nih.gov/29547894/). The two bands in THP-1 extract may represent the alpha and beta isoforms of STING.

2) Please see Rodríguez-García, E. et al. (2018) Immunohorizons 2, 363-376 (PMID: 31026807; https://pubmed.ncbi.nlm.nih.gov/31026807/). STING isoforms 2 and 3 do not include #13647’s epitope. However, STING isoform 1 may be detected by #13647.

3) Given that the lower band is also observed in 293T cells transfected with a construct expressing human STING protein (see image on the product webpage; https://www.cellsignal.com//products/primary-antibodies/sting-d2p2f-rabbit-mab/13647), reasonable guesses would be that it represents a truncated form of STING that results from protease cleavage or an alternative translation start site. 

 

Last updated: February 27, 2024