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Merck
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Key Documents

SRP2014

Sigma-Aldrich

RNA Polymerase II, p33 subunit human

recombinant, expressed in E. coli, ≥80% (SDS-PAGE)

Sinónimos:

RPB3, RPB31, hRPB33, hsRPB3

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About This Item

UNSPSC Code:
12352202
NACRES:
NA.26

biological source

human

recombinant

expressed in E. coli

assay

≥80% (SDS-PAGE)

form

frozen liquid

mol wt

~33.5 kDa

packaging

pkg of 10 μg

storage condition

avoid repeated freeze/thaw cycles

concentration

350 μg/mL

technique(s)

western blot: suitable

color

clear colorless

NCBI accession no.

NM_032940

UniProt accession no.

P19387

shipped in

dry ice

storage temp.

−70°C

Gene Information

human ... POLR2C(5432)

Biochem/physiol Actions

hRPB3 (p33) is a highly conserved subunit shared by all three RNA polymerases. It has been shown to be in close contact to promoter DNA when pol II is recruited into the preinitiation complex. RPB3 has also been implicated in direct protein-protein contacts with transcription factor IIB, Rap30 subunit of transcription factor IIF, and gene-specific modulator proteins, such as the hepatitis B virus transactivator protein X or an inhibitor of pol II, RMP (RPB3-mediating protein). Therefore, RPB3 is facilitating the communication between the pol II core and a variety of basal and gene-specific transcription factors. In the pol II complex, RPB3 interacts with RPB5 and the RPB3–RPB5 interaction is intensified in the presence of three subunits, RPB7, RPB8 and RPB11. RPB3 also makes direct contacts with both RPB1 and RPB2, the two large subunits of the polymerase complex.

Physical form

Clear and colorless frozen liquid solution

Preparation Note

Use a manual defrost freezer and avoid repeated freeze-thaw cycles. While working, please keep sample on ice.

Storage Class

10 - Combustible liquids

wgk_germany

WGK 1

flash_point_f

Not applicable

flash_point_c

Not applicable

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Y Lin et al.
The Journal of biological chemistry, 272(11), 7132-7139 (1997-03-14)
Hepatitis B virus X protein (HBx) transactivates viral and cellular genes through a wide variety of cis-elements. However, the mechanism is still obscure. Our finding that HBx directly interacts with RNA polymerase II subunit 5 (RPB5), a common subunit of
T K Kim et al.
Proceedings of the National Academy of Sciences of the United States of America, 94(23), 12268-12273 (1997-11-14)
By using site-specific protein-DNA photocrosslinking, we define the positions of TATA-binding protein, transcription factor IIB, transcription factor IIF, and subunits of RNA polymerase II (RNAPII) relative to promoter DNA within the human transcription preinitiation complex. The results indicate that the
N A Woychik et al.
Genes & development, 4(3), 313-323 (1990-03-01)
RNA polymerases I, II, and III share three subunits that are immunologically and biochemically indistinguishable. The Saccharomyces cerevisiae genes that encode these subunits (RPB5, RPB6, and RPB8) were isolated and sequenced, and their transcriptional start sites were deduced. RPB5 encodes

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