Immunochemical differences among molecular forms of acetylcholinesterase in brain and blood

Zoltan Rakonczay, William Stephen Brimijoin

Research output: Contribution to journalArticle

11 Citations (Scopus)

Abstract

Molecular forms of acetylcholinesterase (acetylcholine acetylhydrolase, EC 3.1.1.7) differ in their solubility properties as well as in the number of their catalytic subunits. We used monoclonal antibodies to investigate the structure of acetylcholinesterase forms in brain, erythrocytes and serum of rats, rabbits and other mammals. Two antibodies were found to bind tetrameric acetylcholinesterase in preference to the monomeric enzyme. These antibodies also displayed lower affinity for certain forms of 'soluble' brain acetylcholinesterase than for the 'membrane-associated' counterparts. Furthermore, one of them was virtually lacking in affinity for the membrane-associated enzyme of erythrocytes. The basis for the antibody specificity was not fully determined. However, the immunochemical results were supported by measurements of enzyme thermolability, which showed that the catalytic activity of 'soluble' acetylcholinesterase was comparatively heat-resistant. These observations point toward structural differences among the solubility classes of acetylcholinesterase.

Original languageEnglish (US)
Pages (from-to)127-134
Number of pages8
JournalBiochimica et Biophysica Acta (BBA)/Protein Structure and Molecular
Volume832
Issue number2
DOIs
StatePublished - Nov 29 1985

Fingerprint

Acetylcholinesterase
Brain
Blood
Solubility
Antibodies
Enzymes
Erythrocytes
Membranes
Mammals
Antibody Specificity
Rats
Catalyst activity
Catalytic Domain
Hot Temperature
Monoclonal Antibodies
Rabbits
Serum

Keywords

  • Acetylcholinesterase polymorphism
  • Heat stability
  • Monoclonal antibody

ASJC Scopus subject areas

  • Biochemistry
  • Biophysics
  • Molecular Biology
  • Structural Biology

Cite this

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abstract = "Molecular forms of acetylcholinesterase (acetylcholine acetylhydrolase, EC 3.1.1.7) differ in their solubility properties as well as in the number of their catalytic subunits. We used monoclonal antibodies to investigate the structure of acetylcholinesterase forms in brain, erythrocytes and serum of rats, rabbits and other mammals. Two antibodies were found to bind tetrameric acetylcholinesterase in preference to the monomeric enzyme. These antibodies also displayed lower affinity for certain forms of 'soluble' brain acetylcholinesterase than for the 'membrane-associated' counterparts. Furthermore, one of them was virtually lacking in affinity for the membrane-associated enzyme of erythrocytes. The basis for the antibody specificity was not fully determined. However, the immunochemical results were supported by measurements of enzyme thermolability, which showed that the catalytic activity of 'soluble' acetylcholinesterase was comparatively heat-resistant. These observations point toward structural differences among the solubility classes of acetylcholinesterase.",
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AU - Brimijoin, William Stephen

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N2 - Molecular forms of acetylcholinesterase (acetylcholine acetylhydrolase, EC 3.1.1.7) differ in their solubility properties as well as in the number of their catalytic subunits. We used monoclonal antibodies to investigate the structure of acetylcholinesterase forms in brain, erythrocytes and serum of rats, rabbits and other mammals. Two antibodies were found to bind tetrameric acetylcholinesterase in preference to the monomeric enzyme. These antibodies also displayed lower affinity for certain forms of 'soluble' brain acetylcholinesterase than for the 'membrane-associated' counterparts. Furthermore, one of them was virtually lacking in affinity for the membrane-associated enzyme of erythrocytes. The basis for the antibody specificity was not fully determined. However, the immunochemical results were supported by measurements of enzyme thermolability, which showed that the catalytic activity of 'soluble' acetylcholinesterase was comparatively heat-resistant. These observations point toward structural differences among the solubility classes of acetylcholinesterase.

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