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J. Biol. Chem., Vol. 275, Issue 35, 26976-26985, September 1, 2000
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From the The human asparagine synthetase
(AS) gene is transcriptionally regulated by amino
acid deprivation (amino acid response, AAR) and the endoplasmic
reticulum stress response (ERSR), also known as the unfolded protein
response pathway. The results reported here document the novel
observation that induction of the AS gene by the AAR
and ERSR pathways occurs via the same set of genomic elements. Data
supporting this conclusion include transient transfection of AS
promoter/reporter gene constructs that illustrate that the transcriptional control elements used by both pathways are contained with nucleotides
Department of Biochemistry and Molecular
Biology and the § Department of Neuroscience, University of
Florida College of Medicine, Gainesville, Florida 32610
111 to
34 of the AS promoter. In vivo
footprinting analysis of this region identified six specific
protein-binding sites. Within two of these sites, altered footprinting
was observed following amino acid or glucose deprivation, but the
patterns were identical for both the AAR and the ERSR pathway.
Site-directed mutation of individual nucleotides within these two
binding sites confirmed their importance for regulated transcription,
and none of the mutations resulted in loss of response of only one
pathway. Neither of these two sites corresponds to a recently
identified ERSR cis-element, nor do they contain consensus
sequences for known transcription factors. Collectively, the data
document that there are at least two independent transcriptional
mechanisms for gene activation by the ERSR pathway, one of which
terminates at the same genomic elements used by the AAR pathway.
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