A sequence-specific single-strand DNA binding protein that contacts repressor sequences in the human GM-CSF promoter.
NF-GMb is a nuclear factor that binds to the proximal promoter of the human granulocyte-macrophage colony stimulating factor (GM-CSF) gene. NF-GMb has a subunit molecular weight of 22 kDa, is constitutively expressed in embryonic fibroblasts and binds to sequences within the adjacent CK-1 and CK-2 elements (CK-1/CK-2 region), located at approximately -100 in the GM-CSF gene promoter. These elements are conserved in haemopoietic growth factor (HGF) genes. NF-GMb binding requires the presence of repeated 5'CAGG3' sequences that overlap the binding sites for positive activators. Surprisingly, NF-GMb was found to bind solely to single-strand DNA, namely the non-coding strand of the GM-CSF CK-1/CK-2 region. NF-GMb may belong to a family of single-strand DNA binding (ssdb) proteins that have 5'CAGG3' sequences within their binding sites. Functional analysis of the proximal GM-CSF promoter revealed that sequences in the -114 to -79 region of the promoter containing the NF-GMb binding sites had no intrinsic activity in fibroblasts but could, however, repress tumour necrosis factor-alpha (TNF-alpha) inducible expression directed by downstream promoter sequences (-65 to -31). Subsequent mutation analysis showed that sequences involved in repression correlated with those required for NF-GMb binding.
Coles
L S
LS
Division of Human Immunology, Hanson Centre for Cancer Research, Adelaide, Australia.
Occhiodoro
F
F
Vadas
M A
MA
Shannon
M F
MF
D001483:Base Sequence; D001665:Binding Sites; D002460:Cell Line; D004277:DNA, Single-Stranded / Q000378:metabolism; D004268:DNA-Binding Proteins / Q000378:metabolism*; D004622:Embryo, Mammalian; D016178:Granulocyte-Macrophage Colony-Stimulating Factor / Q000235:genetics*; D006801:Humans; D008168:Lung; D008969:Molecular Sequence Data; D016296:Mutagenesis; D010957:Plasmids; D011401:Promoter Regions, Genetic; D012091:Repetitive Sequences, Nucleic Acid; D012097:Repressor Proteins / Q000235:genetics*; D014162:Transfection; D014409:Tumor Necrosis Factor-alpha / Q000494:pharmacology
D004277:DNA, Single-Stranded; D004268:DNA-Binding Proteins; D012097:Repressor Proteins; D014409:Tumor Necrosis Factor-alpha; D016178:Granulocyte-Macrophage Colony-Stimulating Factor