Multiple sclerosis (MS) is a chronic auto-immune disease characterized by a damage to the myelin component of the central nervous system. Self-antigens created by aberrant glycosylation have been described to be a key component in the formation of auto-antibodies. CSF114(Glc) is a synthetic glucopeptide detecting in vitro MS-specific auto-antibodies, and it is actively used in diagnostics and research to monitor and quantify MS-associated Ig levels. We reasoned that antibodies raised against this probe could have been relevant for MS. We therefore screened a human Domain Antibody library against CSF114(Glc) using magnetic separation as a panning method. We obtained and described several clones, and the one with the highest signals was produced as a 6×His-tagged protein to properly study the binding properties as a soluble antibody. By surface plasmon resonance measurements, we evidenced that our clone recognized CSF114(Glc) with high affinity and specific for the glucosylated peptide. Kinetic parameters of peptide-clone interaction were calculated obtaining a value of KD in the nanomolar range. Harboring a human framework, this antibody should be very well tolerated by human immune system and may represent a valuable tool for MS diagnosis and therapy, paving the way to new research strategies.
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