Crystal structure of negative cofactor 2 recognizing the TBP-DNA transcription complex.
The X-ray structure of a ternary complex of Negative Cofactor 2 (NC2), the TATA box binding protein (TBP), and DNA has been determined at 2.6 A resolution. The N termini of NC2 alpha and beta resemble histones H2A and H2B, respectively, and form a heterodimer that binds to the bent DNA double helix on the underside of the preformed TBP-DNA complex via electrostatic interactions. NC2beta contributes to inhibition of TATA-dependent transcription through interactions of its C-terminal alpha helix with a conserved hydrophobic feature on the upper surface of TBP, which in turn positions the penultimate alpha helix of NC2beta to block recognition of the TBP-DNA complex by transcription factor IIB. Further regulatory implications of the NC2 heterodimer structure are discussed.
Kamada
K
K
Laboratory of Molecular Biophysics, 1230 York Avenue, New York, NY 10021, USA.
Shu
F
F
Chen
H
H
Malik
S
S
Stelzer
G
G
Roeder
R G
RG
Meisterernst
M
M
Burley
S K
SK
D000595:Amino Acid Sequence; D000818:Animals; D017173:Caenorhabditis elegans; D018360:Crystallography, X-Ray / Q000379:methods; D004247:DNA / Q000737:chemistry* / Q000378:metabolism; D004268:DNA-Binding Proteins / Q000737:chemistry* / Q000378:metabolism; D004331:Drosophila melanogaster; D006657:Histones / Q000737:chemistry; D006801:Humans; D008958:Models, Molecular; D008969:Molecular Sequence Data; D009690:Nucleic Acid Conformation; D010750:Phosphoproteins / Q000737:chemistry* / Q000378:metabolism; D017433:Protein Structure, Secondary; D016415:Sequence Alignment; D017386:Sequence Homology, Amino Acid; D055672:Static Electricity; D016385:TATA Box; D035181:TATA-Box Binding Protein; D035561:Transcription Factor TFIIA; D035581:Transcription Factor TFIIB; D014157:Transcription Factors / Q000737:chemistry* / Q000378:metabolism; D014158:Transcription, Genetic; D014982:Xenopus laevis
D004268:DNA-Binding Proteins; D006657:Histones; D010750:Phosphoproteins; D035181:TATA-Box Binding Protein; D035561:Transcription Factor TFIIA; D035581:Transcription Factor TFIIB; D014157:Transcription Factors; C075995:down-regulator of transcription 1; D004247:DNA