Anti-helix-loop-helix domain antibodies: discovery of autoantibodies that inhibit DNA binding activity of human centromere protein B (CENP-B).

Abstract:

:Centromere protein B (CENP-B) is one of the centromere DNA binding proteins constituting centromeric heterochromatin of human chromosomes. This protein was originally identified as the target antigen in autoimmune disease patients (often with scleroderma). In this study, we cloned a human CENP-B cDNA which was longer than the previously isolated one and expressed functional recombinant CENP-B in Escherichia coli. The DNA binding domain was finely located within the N-terminal 134-amino-acid residues covering a predicted helix-loop-helix (HLH) structure, by using a set of recombinant products with stepwise deletions from the C-terminus. From the analysis of their reactivity to anti-centromere sera from autoimmune disease patients, four epitopes were mapped on CENP-B antigen. In addition to two epitopes at the C-terminus, two were found on the HLH region at the N-terminus. In the analysis of the interaction between the antigen and autoantibodies, we found that the DNA binding activity of CENP-B was distorted by the attack of the anti-HLH domain antibodies in in vitro binding reactions. Our results suggest that the direct inhibition of the DNA binding activity by the autoantibodies might be involved in patients' autoimmune reactions in vivo.

journal_name

J Biochem

journal_title

Journal of biochemistry

authors

Sugimoto K,Muro Y,Himeno M

doi

10.1093/oxfordjournals.jbchem.a123783

keywords:

subject

Has Abstract

pub_date

1992-04-01 00:00:00

pages

478-83

issue

4

eissn

0021-924X

issn

1756-2651

journal_volume

111

pub_type

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