1PCZ

STRUCTURE OF TATA-BINDING PROTEIN

Summary for 1PCZ

• Entry DOI: 10.2210/pdb1pcz/pdb
• Descriptor: TATA-BINDING PROTEIN (2 entities in total)
• Functional Keywords: transcription regulation, dna-binding protein, nuclear protein, dna binding protein
• Biological source: Pyrococcus woesei
• Total number of polymer chains: 2
• Total formula weight: 42675.52

Authors

Dedecker, B.S.,Sigler, P.B. (deposition date: 1996-10-04, release date: 1997-01-11, Last modification date: 2024-10-23)

Primary citation

DeDecker, B.S.,O'Brien, R.,Fleming, P.J.,Geiger, J.H.,Jackson, S.P.,Sigler, P.B.
The crystal structure of a hyperthermophilic archaeal TATA-box binding protein.
J.Mol.Biol., 264:1072-1084, 1996

PubMed Abstract: This study analyzes the three-dimensional structure of the TATA-box binding protein (TBP) from the hyperthermophilic archaea Pyrococcus woesei. The crystal structure of P. woesei TBP (PwTBP) was solved at 2.2 A by X-ray diffraction and as expected from sequence homology (36% to 41% identical to eukaryotic TBPs) its overall structure is very similar to eukaryotic TBPs. The thermal unfolding transition temperature of this protein was measured by differential scanning calorimetry to be 101 degrees C, which is more than 40 degrees C higher than that of yeast TBP. Preliminary titration calorimetry data show that the affinity of PwTBP for its DNA target, unlike its eukaryotic counterparts, is enhanced by increasing the temperature and salt concentration. The structure reveals possible explanations for this thermostability and these unusual DNA binding properties. The crystal structure of this hyperthermostable protein was compared to its mesophilic homologs and analyzed for differences in the native structure that may contribute to thermostability. Differences found were: (1) a disulfide bond not found in mesophilic counterparts; (2) an increased number of surface electrostatic interactions; (3) more compact protein packing. The presumed DNA binding surface of PwTBP, like its eukaryotic counterparts, is hydrophobic but the electrostatic profile surrounding the protein is relatively neutral compared to the asymmetric positive potential that surrounds eukaryotic TBPs. The total reliance on a hydrophobic interface with DNA may explain the enhanced affinity of PwTBP for its DNA promoter at higher temperatures and increased salt concentration.

PubMed: 9000631
DOI: 10.1006/jmbi.1996.0697

Experimental method

X-RAY DIFFRACTION (2.2 Å)