Use of anti-(β2 microglobulin) mAb to study formation of amyloid fibrils

Monica Stoppini, Vittorio Bellotti, Palma Mangione, Giampaolo Merlini, Giuseppina Ferri

Research output: Contribution to journalArticle

Abstract

Three mAbs, IgG1k 1F11, 7B6 and 14H3, were raised against in vitro-self-aggregated β2-microglobulin. They recognize the native and unfolded forms of the protein and bind its fibrillar form that is present in amyloid tissue. When assayed in fibrillogenesis tests in vitro, mAb 14H3 inhibited fibril formation from β2-microglobulin. This mAb recognizes a sequential epitope corresponding to the C-terminal octapeptide, residues 92-99, of β2-microglobulin. By using synthetic peptides it has been found that the integrity of the sequence is essential for the formation of the immunocomplex: the binding affinity is lowered by one order of magnitude (K(d), from 10-7 M to 10-6 M) by removal of Met99 and completely abolished when both Asp98 and Met99 are lost or Arg98 is substituted with Lys. The other two mAbs, 1F11 and 7B6, which bind sequences 20-41 and 63-75, respectively, are without effect on β2-microglobulin fibrillogenesis. These two mAbs recognize β2-microglobulin bound to the heavy chain in the major histocompatibility complex of type I located in the cell membrane, a property which is not shared by mAb 14H3.

Original languageEnglish
Pages (from-to)21-26
Number of pages6
JournalEuropean Journal of Biochemistry
Volume249
Issue number1
Publication statusPublished - 1997

Keywords

  • β2-microglobulin
  • Amyloidosis
  • Fibrillogenesis
  • Major histocompatibility antigen type I
  • Monoclonal antibody

ASJC Scopus subject areas

  • Biochemistry

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    Stoppini, M., Bellotti, V., Mangione, P., Merlini, G., & Ferri, G. (1997). Use of anti-(β2 microglobulin) mAb to study formation of amyloid fibrils. European Journal of Biochemistry, 249(1), 21-26.