2WMM | pdb_00002wmm

Crystal structure of the hinge domain of MukB

• PDB DOI: https://doi.org/10.2210/pdb2WMM/pdb

• Classification: CELL CYCLE
• Organism(s): Escherichia coli K-12
• Expression System: Escherichia coli BL21(DE3)
• Mutation(s): Yes 


• Deposited: 2009-07-01 Released: 2010-01-12 
• Deposition Author(s): Ku, B., Oh, B.-H.

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 2.30 Å
• R-Value Free: 
  0.240 (Depositor) 
• R-Value Work: 
  0.217 (Depositor), 0.228 (DCC) 
• R-Value Observed: 
  0.217 (Depositor) 

Literature

Crystal structure of the MukB hinge domain with coiled-coil stretches and its functional implications.

Ku, B., Lim, J.H., Shin, H.C., Shin, S.Y., Oh, B.H.

(2010) Proteins 78: 1483-1490

• PubMed: 20034111 
• DOI: https://doi.org/10.1002/prot.22664
• Primary Citation Related Structures: 
  2WMM


• PubMed Abstract: 
  

  The structural maintenance of chromosomes (SMC) family proteins are commonly found in the multiprotein complexes involved in chromosome organization, including chromosome condensation and sister chromatid cohesion. These proteins are characterized by forming a V-shaped homo- or heterodimeric structure with two long coiled-coil arms having two ATPase head domains at the distal ends. The hinge domain, located in the middle of the coiled coil, forms the dimer interface. In addition to being the dimerization module, SMC hinges appear to play other roles, including the gateway function for DNA entry into the cohesin complex. Herein, we report the homodimeric structure of the hinge domain of Escherichia coli MukB, which forms a prokaryotic condensin complex with two non-SMC subunits, MukE and MukF. In contrast with SMC hinge of Thermotoga maritima which has a sizable central hole at the dimer interface, MukB hinge forms a constricted dimer interface lacking a hole. Under our assay conditions, MukB hinge does not interact with DNA in accordance with the absence of a notable positively charged surface patch. The function of MukB hinge appears to be limited to dimerization of two copies of MukB molecules.

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Organizational Affiliation: 
• Department of Biological Sciences, KAIST Institute for the Biocentury, Daejeon, Korea.

Biological Assembly 1  

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

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

Macromolecule Content 

• Total Structure Weight: 36.78 kDa 
• Atom Count: 2,736 
• Modeled Residue Count: 324 
• Deposited Residue Count: 324 
• Unique protein chains: 1

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
Chromosome partition protein MukB	A, B	162	Escherichia coli K-12	Mutation(s): 1  Gene Names: mukB, b0924, JW0907
UniProt
Find proteins for P22523 (Escherichia coli (strain K12)) Explore P22523  Go to UniProtKB:  P22523

Small Molecules

Ligands 1 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram
MLT	C [auth A]	D-MALATE C4 H6 O5 BJEPYKJPYRNKOW-UWTATZPHSA-N

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 2.30 Å
• R-Value Free:  0.240 (Depositor) 
• R-Value Work:  0.217 (Depositor), 0.228 (DCC) 
• R-Value Observed: 0.217 (Depositor) 

Space Group: P 3₂

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 56.443	α = 90
b = 56.443	β = 90
c = 115.443	γ = 120

Software Package:

Software Name	Purpose
CNS	refinement
HKL-2000	data reduction
SCALEPACK	data scaling
SOLVE	phasing

Structure Validation

Entry History 

Deposition Data

• Released Date: 2010-01-12 
Deposition Author(s): Ku, B., Oh, B.-H.

Revision History  

• Version 1.0: 2010-01-12
  Type: Initial release
  
• Version 1.1: 2013-01-30
  Changes: Atomic model, Derived calculations, Non-polymer description, Version format compliance
• Version 1.2: 2018-09-19
  Changes: Data collection, Database references, Source and taxonomy, Structure summary
• Version 1.3: 2024-05-08
  Changes: Data collection, Database references, Derived calculations, Other