Identification of a novel protein from glial cells based on its ability to interact with NF-kappaB subunits.
Nuclear factor kappaB (NF-kappaB) represents a family of inducible DNA-binding transcription factors whose activity is critical for expression of the HIV-1 genome in a broad range of cells. In addition to its interaction with the kappaB DNA sequence, the association of NF-kappaB subunits with other cellular proteins plays an important role in stimulation of HIV-1 gene transcription in astrocytic cells. Here, we utilized a yeast two-hybrid system to screen a cDNA library from a human astrocytic cell line and were able to isolate a partial cDNA belonging to a gene with an open reading frame of 1,871 amino acid residues which binds to both the p50 and p65 subunits of NF-kappaB. This gene, named NF-kappaB-binding protein (NFBP) is located on chromosome 10q24.2-25.1 and hybridized to a single transcript of nearly 6 kb in size. It is localized to the nucleus, specifically the nucleolus of cells. Extensive computer analysis was performed with the sequence of the full length NFBP and significant homology was found between NFBP, and yeast and mouse proteins. A discussion of the potential roles of NFBP in normal and viral infected cells is included.
Sweet
Thersa
T
Center for Neurovirology and Cancer Biology, College of Science and Technology, Temple University, Philadelphia, Pennsylvania 19122, USA. sweet@temple.edu
Khalili
Kamel
K
Sawaya
Bassel E
BE
Amini
Shohreh
S
D001253:Astrocytes / Q000378:metabolism; D002466:Cell Nucleolus / Q000378:metabolism; D002478:Cells, Cultured / Q000378:metabolism / Q000821:virology; D002879:Chromosomes, Human, Pair 10 / Q000235:genetics*; D015723:Gene Library; D005982:Glutathione Transferase / Q000378:metabolism; D015497:HIV-1 / Q000235:genetics; D006801:Humans; D016328:NF-kappa B / Q000502:physiology*; D052002:NF-kappa B p50 Subunit; D009457:Neuroglia / Q000378:metabolism*; D009687:Nuclear Proteins / Q000235:genetics / Q000378:metabolism*; D011401:Promoter Regions, Genetic; D011485:Protein Binding; D012441:Saccharomyces cerevisiae; D051996:Transcription Factor RelA; D020798:Two-Hybrid System Techniques
D016328:NF-kappa B; D052002:NF-kappa B p50 Subunit; D009687:Nuclear Proteins; D051996:Transcription Factor RelA; D005982:Glutathione Transferase