Document Detail

Monoclonal Antibodies 1G12 and 6A12 to the N-domain of human angiotensin-converting enzyme: fine epitope mapping and antibody-based detection of ACE inhibitors in human blood.
MedLine Citation:
PMID:  17326675     Owner:  NLM     Status:  MEDLINE    
Angiotensin I-converting enzyme (ACE), a key enzyme in cardiovascular pathophysiology, consists of two homologous domains (N- and C-), each bearing a Zn-dependent active site. ACE inhibitors are among the most prescribed drugs in the treatment of hypertension and cardiac failure. Fine epitope mapping of two monoclonal antibodies (mAb), 1G12 and 6A12, against the N-domain of human ACE, was developed using the N-domain 3D-structure and 21 single and double N-domain mutants. The binding of both mAbs to their epitopes on the N-domain of ACE is significantly diminished by the presence of the C-domain in the two-domain somatic tissue ACE and further diminished by the presence of sialic acid residues on the surface of blood ACE. The binding of these mAbs to blood ACE, however, increased dramatically (5-10-fold) in the presence of ACE inhibitors or EDTA, whereas the effect of these compounds on the binding of the mAbs to somatic tissue ACE was less pronounced and even less for truncated N-domain. This implies that the binding of ACE inhibitors or removal of Zn2+ from ACE active centers causes conformational adjustments in the mutual arrangement of N- and C-domains in the two-domain ACE molecule. As a result, the regions of the epitopes for mAb 1G12 and 6A12 on the N-domain, shielded in somatic ACE by the C-domain globule and additionally shielded in blood ACE by sialic acid residues in the oligosaccharide chains localized on Asn289 and Asn416, become unmasked. Therefore, we demonstrated a possibility to employ these mAbs (1G12 or 6A12) for detection and quantification of the presence of ACE inhibitors in human blood. This method should find wide application in monitoring clinical trials with ACE inhibitors as well as in the development of the approach for personalized medicine by these effective drugs.
Irina V Balyasnikova; Olga E Skirgello; Petr V Binevski; Andrei B Nesterovitch; Ronald F Albrecht; Olga A Kost; Sergei M Danilov
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Publication Detail:
Type:  Journal Article     Date:  2007-02-28
Journal Detail:
Title:  Journal of proteome research     Volume:  6     ISSN:  1535-3893     ISO Abbreviation:  J. Proteome Res.     Publication Date:  2007 Apr 
Date Detail:
Created Date:  2007-04-09     Completed Date:  2007-07-24     Revised Date:  2011-07-29    
Medline Journal Info:
Nlm Unique ID:  101128775     Medline TA:  J Proteome Res     Country:  United States    
Other Details:
Languages:  eng     Pagination:  1580-94     Citation Subset:  IM    
Department of Anesthesiology, University of Illinois at Chicago, Illinois 60612, USA.
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MeSH Terms
Angiotensin-Converting Enzyme Inhibitors / blood*,  immunology
Antibodies, Monoclonal / immunology*
Binding Sites
Edetic Acid / immunology
Epitope Mapping
Peptidyl-Dipeptidase A / chemistry,  genetics,  immunology*
Polysaccharides / immunology
Protein Structure, Tertiary
Zinc / metabolism
Reg. No./Substance:
0/6A12 monoclonal antibody; 0/Angiotensin-Converting Enzyme Inhibitors; 0/Antibodies, Monoclonal; 0/Polysaccharides; 0/monoclonal antibody 1G12; 60-00-4/Edetic Acid; 7440-66-6/Zinc; EC A

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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