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Mol. Cell. Biol., 04 1995, 2071-2079, Vol 15, No. 4
PN Cockerill, AG Bert, F Jenkins, GR Ryan, MF Shannon and MA Vadas
The promoter of the human granulocyte-macrophage colony-stimulating factor
gene is regulated by an inducible upstream enhancer. The enhancer
encompasses three previously defined binding sites for the transcription
factor NFAT (GM170, GM330, and GM550) and a novel NFAT site defined here as
the GM420 element. While there was considerable redundancy within the
enhancer, the GM330, GM420, and GM550 motifs each functioned efficiently in
isolation as enhancer elements and bound NFATp and AP-1 in a highly
cooperative fashion. These three NFAT sites closely resembled the distal
interleukin-2 NFAT site, and methylation interference assays further
defined GGA(N)9TCA as a minimum consensus sequence for this family of NFAT
sites. By contrast, the GM170 site, which also had conserved GGA and TCA
motifs but in which these motifs were separated by 15 bases, supported
strong independent but no cooperative binding of AP-1 and NFATp, and this
site functioned poorly as an enhancer element. While both the GM330 and
GM420 elements were closely associated with the inducible DNase
I-hypersensitive site within the enhancer, the GM420 element was the only
NFAT site located within a 160-bp HincII-BalI fragment defined by deletion
analysis as the essential core of the enhancer. The GM420 element was
unusual, however, in containing a high-affinity NFATp/c-binding sequence
(TGGAAAGA) immediately upstream of the sequence TGACATCA which more closely
resembled a cyclic AMP response-like element than an AP-1 site.(ABSTRACT
TRUNCATED AT 250 WORDS)
Copyright © 1995, American Society for Microbiology
Human granulocyte-macrophage colony-stimulating factor enhancer function is associated with cooperative interactions between AP-1 and NFATp/c
Division of Human Immunology, Hanson Centre for Cancer Research, Institute for Medical and Veterinary Science, Adelaide, Australia.
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