Macromolecule Content

• Total Structure Weight: 9632.30 
• Atom Count: 675 
• Residue Count: 87 
• Unique protein chains: 1

1DK3

REFINED SOLUTION STRUCTURE OF THE N-TERMINAL DOMAIN OF DNA POLYMERASE BETA

• DOI: 10.2210/pdb1DK3/pdb
• BMRB: 4326

• Classification: TRANSFERASE
• Organism(s): Rattus norvegicus
• Expression System: Escherichia coli


• Deposited: 1999-12-06 Released: 2000-02-14 
• Deposition Author(s): Maciejewski, M.W., Prasad, R., Liu, D.-J., Wilson, S.H., Mullen, G.P.

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Experimental Data Snapshot

• Method: SOLUTION NMR
• Conformers Submitted: 1 

Literature

Backbone dynamics and refined solution structure of the N-terminal domain of DNA polymerase beta. Correlation with DNA binding and dRP lyase activity.

Maciejewski, M.W., Liu, D., Prasad, R., Wilson, S.H., Mullen, G.P.

(2000) J.Mol.Biol. 296: 229-253

• PubMed: 10656829 
• DOI: 10.1006/jmbi.1999.3455
• Primary Citation of Related Structures:  
  1DK2


• PubMed Abstract: 
  

Mammalian DNA polymerase beta functions in the base excision DNA repair pathway filling in short patches (1-5 nt) in damaged DNA and removing deoxyribose 5'-phosphate from the 5'-side of damaged DNA. The backbone dynamics and the refined solution structure of the N-terminal domain of beta-Pol have been characterized in order to establish the potential contribution(s) of backbone motion to the DNA binding and deoxyribose 5'-phosphate lyase function of this domain. The N-terminal domain is formed from four helices packed as two antiparallel pairs with a 60 degrees crossing between the pairs. The RMSD of the NMR conformers (residues 13-80) is 0.37 A for the backbone heavy atoms and 0.78 A for all heavy atoms. NMR characterization of the binding site(s) for a ssDNA-5mer, ssDNA-8mer, ssDNA-9mer, and dsDNA-12mer shows a consensus surface for the binding of these various DNA oligomers, that surrounds and includes the deoxyribose 5'-phosphate lyase active site region. Connection segments between helices 1 and 2 and between helices 3 and 4 each contribute to DNA binding. Helix-3-turn-helix-4 forms a helix-hairpin-helix motif. The highly conserved hairpin sequence (LPGVG) displays a significant degree of picosecond time-scale motion within the backbone, that is possibly important for DNA binding at the phosphodiester backbone. An Omega-loop connecting helices 1 and 2 and helix-2 itself display significant exchange contributions (R(ex)) at the backbone amides due to apparent conformational type motion on a millisecond time-scale. This motion is likely important in allowing the Omega-loop and helix-2 to shift toward, and productively interact with, gapped DNA. The deoxyribose 5'-phosphate lyase catalytic residues that include K72 which forms the Schiff's base, Y39 which is postulated to promote proton transfer to the aldehyde, and K35 which assists in phosphate elimination, show highly restricted backbone motion. H34, which apparently participates in detection of the abasic site hole and assists in the opening of the hemiacetal, shows conformational exchange.

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Related Citations: 

• Three-Dimensional Solution Structure of the N-terminal Domain of DNA Polymerase beta and Mapping of the ssDNA Interaction Interface
  Liu, D.-J.,Prasad, R.,Wilson, S.H.,DeRose, E.F.,Mullen, G.P.
  (1996) Biochemistry 35: 6188
• Assignments of 1H, 15N, and 13C Resonances for the Backbone and Side Chains of the N-terminal domain of DNA Polymerase beta. Determination of the Secondary Structure and Tertiary Contacts.
  Liu, D.-J.,DeRose, E.F.,Prasad, R.,Wilson, S.H.,Mullen, G.P.
  (1994) Biochemistry 33: 9537




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Organizational Affiliation: 

Department of Biochemistry, University of Connecticut Health Center, 263 Farmington Avenue, Farmington, CT 06032, USA.

Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details
DNA POLYMERASE BETA	A	87	Rattus norvegicus	Mutation(s): 0  Gene Names: Polb EC: 2.7.7.7, 4.2.99.-
Find proteins for P06766 (Rattus norvegicus) Go to UniProtKB:  P06766

Experimental Data & Validation

Experimental Data

• Method: SOLUTION NMR
• Conformers Submitted: 1 

Structure Validation

Entry History 

Deposition Data

• Deposited Date: 1999-12-06 
• Released Date: 2000-02-14 
• Deposition Author(s): Maciejewski, M.W., Prasad, R., Liu, D.-J., Wilson, S.H., Mullen, G.P.

Revision History 

• Version 1.0: 2000-02-14
  Type: Initial release
• Version 1.1: 2008-04-27
  Type: Version format compliance
• Version 1.2: 2011-07-13
  Type: Version format compliance