Open AccessIdentification of Proteins Immunologically Related to Interferon Regulatory Factor–1 That Bind with Interferon Regulatory Factor Element
Author(s) -
Sara Contente,
Frank A. Attard,
Robert M. Friedman
Publication year - 2006
Publication title -
the journal of infectious diseases
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.69
H-Index - 252
eISSN - 1537-6613
pISSN - 0022-1899
DOI - 10.1086/505358
Subject(s) - interferon regulatory factors , irf1 , biology , epitope , dna binding protein , regulatory sequence , microbiology and biotechnology , interferon , irf8 , oligonucleotide , antiserum , binding protein , antibody , transcription factor , dna , virology , biochemistry , immunology , gene
Interferon regulatory factor (IRF)-1 expression was surveyed in nontransformed and oncogene-transformed mouse fibroblasts, using Western immunoblot with an IRF-1-specific antiserum, to examine possible differences resulting from cellular transformation. Ten additional proteins that reacted with the IRF-1 antibody and that underwent specific competition by peptide antigen were observed in extracts of both nontransformed and oncogene-transformed cell lines. Cross-reacting proteins were also observed in mouse macrophage extracts. Protein was captured from fibroblast nuclear extracts, using oligonucleotides representing IRF-binding sequences linked to magnetic beads. Captured proteins were eluted and analyzed by immunoblot with anti-IRF-1. Along with 43-kDa IRF-1, 4 of the 7 nuclearly located cross-reacting proteins (97, 90, 66, and 33 kDa) were found to complex with the IRF binding element. These proteins, with an epitope in common with the IRF-1 C-terminal region and IRF element DNA sequence-binding capability, may represent new members of the IRF family.
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