Cited by 100interferon and immune responsesCytokine Signaling Pathways and InteractionsGenomics and Chromatin Dynamics

Functional Domain Analysis of Interferon Consensus Sequence Binding Protein (ICSBP) and Its Association with Interferon Regulatory Factors

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Sharf, Rakefet, Azriel, Aviva, Lejbkowicz, Flavio, Winograd, Sigal S., Ehrlich, Rachel, Levi, Ben-Zion·1995·Journal of Biological Chemistry

Abstract

Interferon consensus sequence binding protein (ICSBP) is a member of the interferon regulatory factor (IRF) family of proteins that include IRF-1, IRF-2, and ISGF3gamma which share sequence similarity at the putative DNA binding domain (DBD). ICSBP is expressed exclusively in cells of the immune system and acts as a repressor of interferon consensus sequence (ICS) containing promoters that can be alleviated by interferons. In this communication, we have searched for functional domains of ICSBP by dissecting the DBD from the repression activity. The putative DBD of ICSBP (amino acids 1-121) when fused in frame to the transcriptional activation domain of the herpes simplex VP16 (ICSBP-VP16) is a very strong activator of ICS-containing promoters. In addition, ICSBP-VP16 fusion construct transfected into adenovirus (Ad) 12 transformed cells enabled cell surface expression of major histocompatibility complex class I antigens as did treatment with interferon. On the other hand, the DBD of the yeast transcriptional activator GAL4 was fused in frame to a truncated ICSBP in which the DBD was impaired resulting in a chimeric construct GAL4-ICSBP. This construct is capable of repressing promoters containing GAL4 binding sites. Thus, ICSBP contains at least two independent domains: a DBD and a transcriptional repressor domain. Furthermore, we have tested possible interactions between ICSBP and IRFs. The chimeric construct GAL4-ICSBP inhibited the stimulated effect of IRF-1 on a reporter gene, implying for a possible interaction between IRF-1 and ICSBP. Electromobility shift assays, demonstrated that ICSBP can associate with IRF-2 or IRF-1 in vitro as well as in vivo. Thus, ICSBP contains a third functional domain that enables the association with IRFs. These associations are probably important for the fine balance between positive and negative regulators involved in the interferon-mediated signal transduction pathways in cells of the immune system.

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Crossref · 10.1074/jbc.270.22.13063

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  • ICSBP has a conserved DNA-binding domain (DBD) at the N-terminal region and an IRF association domain (IAD) in the C-terminal region.

    “ICSBP has the DNAbinding domain (DBD) conserved in the IRF family at the Nterminal region and the IRF association domain (IAD) in the C-terminal region (Fig. 1). (2-5)”
  • ICSBP interacts with IRF-1, IRF-2, or IRF-4 on the ISRE and negatively regulates some IFN-inducible genes, such as ISG15, which carries a functional ISRE.

    “ICSBP interacts with IRF-1, IRF2, or IRF-4 on the ISRE and negatively regulates some IFNinducible genes, such as ISG15 , which carries a functional ISRE. (4,24,25)”

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Authors
Sharf, R., Azriel, A., Lejbkowicz, F., Winograd, S. S., Ehrlich, R., & Levi, B.-Z.
Affiliations
  • Technion – Israel Institute of Technology (IL)
  • Tel Aviv University (IL)
Corresponding author
Levi, Ben-Zion
Venue
Journal of Biological Chemistry
Publisher
Elsevier BV
Published
1995-06
Volume
270
Issue
22
Pages
13063-13069
ISSN
0021-9258 (ISSN-L)
OpenAlex
W2043663222
Cited by
100
References
29
Citations by year
2025: 2 · 2024: 4 · 2023: 1 · 2022: 3 · 2021: 1 · 2020: 1 · 2019: 4 · 2018: 2 · 2017: 2 · 2016: 3 · 2015: 2 · 2014: 1 · 2013: 1 · 2012: 1
FWCI
2.58
Type
journal article
Language
en
Open access
Locations
  • Journal of Biological Chemistry (publishedVersion, cc-by)
  • PubMed (publishedVersion)
Topics
  • Life Sciences › Immunology and Microbiology › Immunology › interferon and immune responses
  • Health Sciences › Medicine › Oncology › Cytokine Signaling Pathways and Interactions
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Genomics and Chromatin Dynamics
Keywords
interferon regulatory factors, IRF1, IRF2, DNA-binding domain, MHC class I antigen expression, protein-protein interaction, transactivation domain
MeSH terms
Interferon Regulatory Factor-8, Base Sequence, Carrier Proteins, Cell Line, DNA-Binding Proteins, Humans, Molecular Sequence Data, Phosphoproteins, Plasmids, Recombinant Fusion Proteins, Repressor Proteins, Transcription Factors, Trans-Activators, DNA Primers, Interferon-Stimulated Gene Factor 3, Interferon-Stimulated Gene Factor 3, gamma Subunit, Interferon Regulatory Factors, Interferon Regulatory Factor-1

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