Identification of the Autoantigen HB as the Barrier-to-Autointegration Factor

Ignasi Forné, Montserrat Carrascal, Luis Martinez-Lostao, Joaquin Abian, Jose Luis Rodriguez-Sánchez, Candido Juarez

Research output: Contribution to journalArticleResearchpeer-review

13 Citations (Scopus)


The HB autoantigen, a 10-kDa DNA-binding protein recognized by autoantibodies only when bound to DNA, was identified by two-dimensional electrophoresis. Silver-stained protein spots corresponding to the antigen were excised from two-dimensional electrophoresis gels, digested with trypsin, and analyzed by matrix-assisted laser desorption/ionization-reflectron time of flight and nano-electrospray ionization-ion trap/mass spectrometry. Data base search identified the HB antigen as the barrier-to-autointegration factor, a cellular protein implicated in the cellular cycle that blocks autointegration and promotes intermolecular integration of retrovirus such as the Moloney murine leukemia and the human immunodeficiency type 1 virus. The physicochemical characteristics described for these proteins, their ability to bind double-stranded DNA but not single-stranded DNA, and their nuclear localization confirm that HB and barrier-to-autointegration factor are the same protein.
Original languageEnglish
Pages (from-to)50641-50644
JournalJournal of Biological Chemistry
Issue number50
Publication statusPublished - 12 Dec 2003


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