CloneID: A4
Antigen Long Description: This mouse CD47-specific antagonist nanobody was raised by immunising alpacas with the extracellular Ig-like V-type domain (ECD) of mouse CD47. Subsequently, peripheral blood lymphocytes (PBLs) were isolated from immunized alpacas, and the extracted RNA was used to construct a VHH phage display library. The antibody was generated by panning against the mouse CD47 ECD.
Buffer Composition: PBS only.
Uniprot Accession No.: Q61735
Specificity Statement: This nanobody is specific for murine CD47, a glycosylated five transmembrane protein with a small cytoplasmic domain. CD47 is involved in adhesion through interactions with SIRP (signal regulator protein) and is non-covalently associated with β3 integrins
Application Notes (Clone): This nanobody has been shown to bind with high affinity and specificity to mouse CD47, as characterized by SPR and FACS (Sockolosky et al 2016). In vitro functional assays suggest that this nanobody potently blocks SIRPα binding to tumor cell-surface CD47, while broadly recognizing mouse hematopoietic and red blood cells without causing erythropenia (Sockolosky et al 2016). The original nanobody was reported to bind immobilized mouse CD47 with a binding affinity of Kd= ∼12 pM (Sockolosky et al 2016). Consistent with its species-specific binding properties, this nanobody has been found not to influence human macrophage phagocytosis of human tumor cells. Furthermore, this nanobody has been used to investigate the biological consequences of antagonizing CD47 in syngeneic mouse disease models (Sockolosky et al 2016).
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