RPAP1, a novel human RNA polymerase II-associated protein affinity purified with recombinant wild-type and mutated polymerase subunits.
We have programmed human cells to express physiological levels of recombinant RNA polymerase II (RNAPII) subunits carrying tandem affinity purification (TAP) tags. Double-affinity chromatography allowed for the simple and efficient isolation of a complex containing all 12 RNAPII subunits, the general transcription factors TFIIB and TFIIF, the RNAPII phosphatase Fcp1, and a novel 153-kDa polypeptide of unknown function that we named RNAPII-associated protein 1 (RPAP1). The TAP-tagged RNAPII complex is functionally active both in vitro and in vivo. A role for RPAP1 in RNAPII transcription was established by shutting off the synthesis of Ydr527wp, a Saccharomyces cerevisiae protein homologous to RPAP1, and demonstrating that changes in global gene expression were similar to those caused by the loss of the yeast RNAPII subunit Rpb11. We also used TAP-tagged Rpb2 with mutations in fork loop 1 and switch 3, two structural elements located strategically within the active center, to start addressing the roles of these elements in the interaction of the enzyme with the template DNA during the transcription reaction.
Laboratory of Gene Transcription, Institut de Recherches Cliniques de Montréal, Montreal, Quebec, Canada H2W 1R7.
Célia
C
Jeronimo
Marie-France
MF
Langelier
Mahel
M
Zeghouf
Marilena
M
Cojocaru
Dominique
D
Bergeron
Dania
D
Baali
Diane
D
Forget
Sanie
S
Mnaimneh
Armaity P
AP
Davierwala
Jeff
J
Pootoolal
Mark
M
Chandy
Veronica
V
Canadien
Bryan K
BK
Beattie
Dawn P
DP
Richards
Jerry L
JL
Workman
Timothy R
TR
Hughes
Jack
J
Greenblatt
Benoit
B
Coulombe
D000818:Animals; D001483:Base Sequence; D001665:Binding Sites; D002352:Carrier Proteins / Q000235:genetics / Q000302:isolation & purification* / Q000378:metabolism*; D004247:DNA / Q000378:metabolism; D020224:Expressed Sequence Tags; D005786:Gene Expression Regulation; D006657:Histones / Q000378:metabolism; D006801:Humans; D008958:Models, Molecular; D008969:Molecular Sequence Data; D009097:Multienzyme Complexes; D009154:Mutation; D010749:Phosphoprotein Phosphatases / Q000302:isolation & purification / Q000378:metabolism; D011401:Promoter Regions, Genetic; D011487:Protein Conformation; D021122:Protein Subunits / Q000235:genetics / Q000302:isolation & purification* / Q000378:metabolism*; D012319:RNA Polymerase II / Q000235:genetics / Q000302:isolation & purification* / Q000378:metabolism*; D011994:Recombinant Proteins / Q000235:genetics / Q000302:isolation & purification / Q000378:metabolism; D012441:Saccharomyces cerevisiae / Q000737:chemistry / Q000235:genetics / Q000378:metabolism; D029701:Saccharomyces cerevisiae Proteins / Q000235:genetics / Q000378:metabolism; D012689:Sequence Homology, Nucleic Acid; D035581:Transcription Factor TFIIB / Q000235:genetics / Q000302:isolation & purification / Q000378:metabolism; D019473:Transcription Factors, TFII / Q000235:genetics / Q000302:isolation & purification / Q000378:metabolism; D014158:Transcription, Genetic
D002352:Carrier Proteins; D006657:Histones; D009097:Multienzyme Complexes; D021122:Protein Subunits; C489243:RPAP1 protein, human; D011994:Recombinant Proteins; D029701:Saccharomyces cerevisiae Proteins; D035581:Transcription Factor TFIIB; D019473:Transcription Factors, TFII; D004247:DNA; D012319:RNA Polymerase II; D010749:Phosphoprotein Phosphatases; C116022:carboxy-terminal domain phosphatase; C056604:transcription factor TFIIF