3P16

Crystal structure of DNA polymerase III sliding clamp

Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.89 Å
  • R-Value Free: 0.287 
  • R-Value Work: 0.260 
  • R-Value Observed: 0.261 

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Literature

Crystal structure of DNA polymerase III beta sliding clamp from Mycobacterium tuberculosis.

Gui, W.J., Lin, S.Q., Chen, Y.Y., Zhang, X.E., Bi, L.J., Jiang, T.

(2011) Biochem Biophys Res Commun 405: 272-277

  • DOI: 10.1016/j.bbrc.2011.01.027
  • Primary Citation of Related Structures:  
    3P16

  • PubMed Abstract: 

    • The sliding clamp is a key component of DNA polymerase III (Pol III) required for genome replication. It is known to function with diverse DNA repair proteins and cell cycle-control proteins, making it a potential drug target. To extend our understanding ...

    The sliding clamp is a key component of DNA polymerase III (Pol III) required for genome replication. It is known to function with diverse DNA repair proteins and cell cycle-control proteins, making it a potential drug target. To extend our understanding of the structure/function relationship of the sliding clamp, we solved the crystal structure of the sliding clamp from Mycobacterium tuberculosis (M. tuberculosis), a human pathogen that causes most cases of tuberculosis (TB). The sliding clamp from M. tuberculosis forms a ring-shaped head-to-tail dimer with three domains per subunit. Each domain contains two α helices in the inner ring that lie against two β sheets in the outer ring. Previous studies have indicated that many Escherichia coli clamp-binding proteins have a conserved LF sequence, which is critical for binding to the hydrophobic region of the sliding clamp. Here, we analyzed the binding affinities of the M. tuberculosis sliding clamp and peptides derived from the α and δ subunits of Pol III, which indicated that the LF motif also plays an important role in the binding of the α and δ subunits to the sliding clamp of M. tuberculosis.

    Organizational Affiliation: 

    National Laboratory of Biomacromolecules, Institute of Biophysics, Chinese Academy of Sciences, 15 Datun Road, Chaoyang District, Beijing 100101, China.



Macromolecules
Find similar proteins by: 
(by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
DNA polymerase III subunit beta A, B, C, D, E, F408Mycobacterium tuberculosis H37RvMutation(s): 0 
Gene Names: dnaN, Rv0002, MT0002, MTV029.02, MTCY10H4.0
EC: 2.7.7.7
Find proteins for P9WNU1 (Mycobacterium tuberculosis (strain ATCC 25618 / H37Rv))
Explore P9WNU1 
Go to UniProtKB:  P9WNU1
Protein Feature View
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.89 Å
  • R-Value Free: 0.287 
  • R-Value Work: 0.260 
  • R-Value Observed: 0.261 
  • Space Group: P 1 21 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 88.05α = 90
b = 132.974β = 109.05
c = 113.777γ = 90
Software Package:
Software NamePurpose
HKL-2000data collection
PHASERphasing
REFMACrefinement
HKL-2000data reduction
HKL-2000data scaling

Structure Validation

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Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2011-08-17
    Type: Initial release