Abstract
The gene expression of granulocyte colony‐stimulating factor (G‐CSF) is induced by lipopolysaccharide (LPS). GPE1, a cis‐controlling element of the G‐CSF gene, functions as an LPS‐responsive element. GPE1‐binding protein (GPE1‐BP), a leucine‐zipper protein, did not independently activate G‐CSF gene expression. Protein blot analysis with biotinylated GPE1‐BP revealed that there were nuclear proteins that interact specifically with GPE1‐BP. Three leucine‐zipper proteins were isolated from mouse cDNA expression libraries by this method: NF‐IL6, ATF4, and a novel ATF4‐related ATFx. The interactions of these proteins with GPE1‐BP may play key roles in G‐CSF gene expression.

This publication has 12 references indexed in Scilit: