sifalimumab   Click here for help

GtoPdb Ligand ID: 8257

Synonyms: MDX-1103 | MEDI-545 | MEDI545
Immunopharmacology Ligand
Compound class: Antibody
Comment: Sifalimumab is a monoclonal antibody targeting interferon α1 (IFNA1), that was developed by the MedImmune subsidiary of AstraZeneca as a treatment for systemic lupus erythematosus (SLE). Development of sifalimumab was terminated and MedImmune concentrated on their alternative anti-IFNα agent anifrolumab.
Peptide sequence and structural information for this antibody are available from its IMGT/mAb-db record. Sequence BLAST using the heavy and light chain variable regions of sifalimumab provides 100% matches to sequences patented with application US7741449 [12]. The sequence matches identify sifalimumab as clone 13H5 in the patent.
Selectivity at ligand targets
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Target Sp. Type Action Value Parameter Concentration range (M) Reference
IFN-α2 Hs Antibody Binding 10.0 pKd - 12
pKd 10.0 (Kd 1x10-10 M) [12]
IFN-α1/13 Hs Antibody Binding 8.3 pEC50 - 12
pEC50 8.3 (EC50 4.6x10-9 M) [12]
Description: Inhibition of the antiproliferative effect of IFNA1 on Daudi cells in culture.