sub:provenance {
  beldoc: dce:description "Approximately 61,000 statements." ;
    dce:rights "Copyright (c) 2011-2012, Selventa. All rights reserved." ;
    dce:title "BEL Framework Large Corpus Document" ;
    pav:authoredBy sub:_6 ;
    pav:version "1.4" .
  sub:_5 prov:value "Moreover, PP1 was shown to act as a major CTD phosphatase in nuclear extracts and to affinity-purify with RNA polymerase II. Both PP1 and the nuclear regulator NIPP1 have also been identified as components of the Tat-associated RNA polymerase II complex, which regulates transcription from the human immunodeficiency virus type 1 promoter (40, 275). The transcription factor CREB mediates the expression of cAMP-induced genes by binding to a conserved cAMP-responsive element. Phosphorylation of CREB on Ser-133, e.g., by PKA, promotes the recruitment of the histone acetyltransferase CBP, which facilitates access of the promoter region to the transcriptional machinery." ;
    prov:wasQuotedFrom pubmed:14715909 .
  sub:_6 rdfs:label "Selventa" .
  sub:assertion prov:hadPrimarySource pubmed:14715909 ;
    prov:wasDerivedFrom beldoc: , sub:_5 .
}