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A class of 4-aza-lithocholic acid-derived haptens for the generation of catalytic antibodies with steroid synthase capabilities

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Overview

authors

  • Hasserodt, J.
  • Janda, Kim
  • Lerner, Richard

publication date

  • May 2000

journal

  • Bioorganic & Medicinal Chemistry  Journal

abstract

  • The syntheses of a class of three haptens derived from the same 4-aza-steroidal skeleton is described. The sequence begins with oxidative cleavage of ring A of commercially available, optically pure lithocholic acid. Insertion of nitrogen at position 4 and stereoselective hydrogenation of the resulting electron-rich enelactam under 600 psi H2 yielded a system analogous to testosterone-5-alpha-reductase inhibitors. Upon exhaustive reduction of this compound with lithium aluminium hydride, a linker for bioconjugation was attached before the N-oxide key functionality is established in ring A. This functional group is believed to be a true transition-state mimic for the electronic nature of initiation of the cationic cyclization of 2,3-epoxy-squalene derivatives. In addition, it also holds promise for eliciting acidic residues as part of a bait-and-switch strategy. Remarkably, both N-oxide epimers obtained from mCPBA oxidation can be separated by column chromatography on a 60 mg scale and were used in enantiopure form for separate immunizations. Reliable configurative assignment was carried out by comparison studies with previously characterized and published systems. A catalytic antibody (HA8-25A10) was obtained from the immunization with the hapten bearing an aminoxide oxygen in the beta position. Surprisingly, an inhibition study showed that the isomer with the inverted configuration at the N-oxide bound more strongly to this catalytic antibody.

subject areas

  • Antibodies, Catalytic
  • Aza Compounds
  • Haptens
  • Lithocholic Acid
  • Nuclear Magnetic Resonance, Biomolecular
  • Oxidoreductases
  • Protein Conformation
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Identity

International Standard Serial Number (ISSN)

  • 0968-0896

Digital Object Identifier (DOI)

  • 10.1016/s0968-0896(00)00036-5

PubMed ID

  • 10882011
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Additional Document Info

start page

  • 995

end page

  • 1003

volume

  • 8

issue

  • 5

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