Biological Assembly 1  

Global Symmetry: Cyclic - C2  (3D View)
Global Stoichiometry: Homo 2-mer - A2 

Biological assembly 1 assigned by authors and generated by PISA (software)

Macromolecule Content

• Total Structure Weight: 190.42 kDa 
• Atom Count: 13,160 
• Modelled Residue Count: 1,577 
• Deposited Residue Count: 1,635 
• Unique protein chains: 1
• Unique nucleic acid chains: 2

 1WBD

Crystal structure of E. coli DNA mismatch repair enzyme MutS, E38Q mutant, in complex with a G.T mismatch

• PDB DOI: 10.2210/pdb1WBD/pdb
• NDB: PD0834

• Classification: DNA-BINDING
• Organism(s): Escherichia coli
• Expression System: Escherichia coli BL21
• Mutation(s): Yes 


• Deposited: 2004-10-31 Released: 2006-01-18 
• Deposition Author(s): Natrajan, G., Georgijevic, D., Lebbink, J.H.G., Winterwerp, H.H.K., de Wind, N., Sixma, T.K.

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 2.40 Å
• R-Value Free: 0.259 
• R-Value Work: 0.212 
• R-Value Observed: 0.213 

Literature

Dual Role of Muts Glutamate 38 in DNA Mismatch Discrimination and in the Authorization of Repair.

Lebbink, J.H.G., Georgijevic, D., Natrajan, G., Fish, A., Winterwerp, H.H.K., Sixma, T.K., De Wind, N.

(2006) EMBO J 25: 409

• PubMed: 16407973 
• DOI: 10.1038/sj.emboj.7600936
• Primary Citation of Related Structures:  
  1WB9, 1WBB, 1WBD


• PubMed Abstract: 
  

MutS plays a critical role in DNA mismatch repair in Escherichia coli by binding to mismatches and initiating repair in an ATP-dependent manner. Mutational analysis of a highly conserved glutamate, Glu38, has revealed its role in mismatch recognition by enabling MutS to discriminate between homoduplex and mismatched DNA. Crystal structures of MutS have shown that Glu38 forms a hydrogen bond to one of the mismatched bases. In this study, we have analyzed the crystal structures, DNA binding and the response to ATP binding of three Glu38 mutants. While confirming the role of the negative charge in initial discrimination, we show that in vivo mismatch repair can proceed even when discrimination is low. We demonstrate that the formation of a hydrogen bond by residue 38 to the mismatched base authorizes repair by inducing intramolecular signaling, which results in the inhibition of rapid hydrolysis of distally bound ATP. This allows formation of the stable MutS-ATP-DNA clamp, a key intermediate in triggering downstream repair events.

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Organizational Affiliation: 

Division of Molecular Carcinogenesis, The Netherlands Cancer Institute, Amsterdam, The Netherlands.

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
DNA MISMATCH REPAIR PROTEIN MUTS	A, B	800	Escherichia coli	Mutation(s): 1
UniProt
Find proteins for P23909 (Escherichia coli (strain K12)) Explore P23909  Go to UniProtKB:  P23909

Entity ID: 2
Molecule	Chains	Length	Organism	Image
5'-D(*AP*GP*CP*TP*GP*CP*CP*AP*GP*GP *CP*AP*CP*CP*AP*GP*TP*G)-3'	C [auth E]	18	N/A

Entity ID: 3
Molecule	Chains	Length	Organism	Image
5'-D(*AP*CP*TP*GP*GP*TP*GP*CP*TP*TP *GP*GP*CP*AP*GP*CP*T)-3'	D [auth F]	17	N/A

Small Molecules

Ligands 2 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram
ADP	E [auth A]	ADENOSINE-5'-DIPHOSPHATE C10 H15 N5 O10 P2 XTWYTFMLZFPYCI-KQYNXXCUSA-N
MG	F [auth A]	MAGNESIUM ION Mg JLVVSXFLKOJNIY-UHFFFAOYSA-N

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 2.40 Å
• R-Value Free: 0.259 
• R-Value Work: 0.212 
• R-Value Observed: 0.213 
• Space Group: P 2₁ 2₁ 2₁

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 89.62	α = 90
b = 92.042	β = 90
c = 260.977	γ = 90

Software Package:

Software Name	Purpose
REFMAC	refinement
DENZO	data reduction
SCALEPACK	data scaling

Structure Validation

Entry History 

Deposition Data

• Released Date: 2006-01-18 
Deposition Author(s): Natrajan, G., Georgijevic, D., Lebbink, J.H.G., Winterwerp, H.H.K., de Wind, N., Sixma, T.K.

Revision History  

• Version 1.0: 2006-01-18
  Type: Initial release
  
• Version 1.1: 2011-07-13
  Changes: Advisory, Version format compliance