ISSN:
1423-0127
Keywords:
Transcription
;
cAMP
;
Steroidogenesis
;
Protein kinase
;
Adrenal
;
Cytochrome P450
;
Adrenodoxin
Source:
Springer Online Journal Archives 1860-2000
Topics:
Biology
,
Medicine
Notes:
Abstract We characterized a regulatory element located in the −76 to −62 region of the human ferredoxin gene. This region bound to Sp1-like proteins with low affinity, as shown using electrophoretic mobility shift, competition, antibody binding, and Southwestern experiments. The similarity of the regulatory element to Sp1 extends beyond its DNA-binding domain, as cloned Sp1 functioned equally well when fused to a peptide that bound to an irrelevant site. The function of these Sp1-binding sites is mediated through the cAMP-dependent protein kinase (PKA) signaling pathway, because reporter genes downstream of the Sp1-binding sites were not activated in a PKA-deficient cell line. Transfection of the catalytic subunit of PKA restored activated transcription. Similar Sp1-binding sites identified in the CYP11A1 and CYP21 genes also controlled cAMP-dependent transcription of the reporter gene. Our finding of the function of Sp1-like proteins in steroidogenic gene transcription adds one more role Sp1 plays in controlling physiological events.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF02256621
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