2DB4

Crystal structure of rotor ring with DCCD of the V- ATPase from Enterococcus hirae


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.40 Å
  • R-Value Free: 0.231 
  • R-Value Work: 0.225 
  • R-Value Observed: 0.225 

wwPDB Validation   3D Report Full Report


This is version 1.4 of the entry. See complete history


Literature

Structure of the rotor ring modified with N,N'-dicyclohexylcarbodiimide of the Na+-transporting vacuolar ATPase.

Mizutani, K.Yamamoto, M.Suzuki, K.Yamato, I.Kakinuma, Y.Shirouzu, M.Walker, J.E.Yokoyama, S.Iwata, S.Murata, T.

(2011) Proc Natl Acad Sci U S A 108: 13474-13479

  • DOI: 10.1073/pnas.1103287108
  • Primary Citation of Related Structures:  
    3AOU, 2DB4

  • PubMed Abstract: 
  • The prokaryotic V-ATPase of Enterococcus hirae, closely related to the eukaryotic enzymes, provides a unique opportunity to study the ion-translocation mechanism because it transports Na(+), which can be detected by radioisotope (22Na(+)) experiments ...

    The prokaryotic V-ATPase of Enterococcus hirae, closely related to the eukaryotic enzymes, provides a unique opportunity to study the ion-translocation mechanism because it transports Na(+), which can be detected by radioisotope (22Na(+)) experiments and X-ray crystallography. In this study, we demonstrated that the binding affinity of the rotor ring (K ring) for 22Na(+) decreased approximately 30-fold by reaction with N,N(')-dicyclohexylcarbodiimide (DCCD), and determined the crystal structures of Na(+)-bound and Na(+)-unbound K rings modified with DCCD at 2.4- and 3.1-Å resolutions, respectively. Overall these structures were similar, indicating that there is no global conformational change associated with release of Na(+) from the DCCD-K ring. A conserved glutamate residue (E139) within all 10 ion-binding pockets of the K ring was neutralized by modification with DCCD, and formed an "open" conformation by losing hydrogen bonds with the Y68 and T64 side chains, resulting in low affinity for Na(+). This open conformation is likely to be comparable to that of neutralized E139 forming a salt bridge with the conserved arginine of the stator during the ion-translocation process. Based on these findings, we proposed the ion-translocation model that the binding affinity for Na(+) decreases due to the neutralization of E139, thus releasing bound Na(+), and that the structures of Na(+)-bound and Na(+)-unbound DCCD-K rings are corresponding to intermediate states before and after release of Na(+) during rotational catalysis of V-ATPase, respectively.


    Organizational Affiliation

    Department of Chemistry, Graduate School of Science, Chiba University, 1-33 Yayoi-cho, Inage, Chiba 263-8522, Japan.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
V-Type Sodium ATPase Subunit KABCDEFGHIJ156Enterococcus hiraeMutation(s): 0 
EC: 3.6.3.14
Find proteins for P43457 (Enterococcus hirae (strain ATCC 9790 / DSM 20160 / JCM 8729 / LMG 6399 / NBRC 3181 / NCIMB 6459 / NCDO 1258))
Explore P43457 
Go to UniProtKB:  P43457
Protein Feature View
Expand
  • Reference Sequence
Small Molecules
Ligands 4 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
LHG
Query on LHG

Download Ideal Coordinates CCD File 
A, B, C, D, E, F, G, H, I, J
1,2-DIPALMITOYL-PHOSPHATIDYL-GLYCEROLE
C38 H75 O10 P
BIABMEZBCHDPBV-MPQUPPDSSA-N
 Ligand Interaction
UMQ
Query on UMQ

Download Ideal Coordinates CCD File 
A, C, D, E, F, H, I, J
UNDECYL-MALTOSIDE
C23 H44 O11
UYEMNFYVTFDKRG-ZNGNCRBCSA-N
 Ligand Interaction
DCW
Query on DCW

Download Ideal Coordinates CCD File 
A, B, C, D, E, F, G, H, I, J
DICYCLOHEXYLUREA
C13 H24 N2 O
ADFXKUOMJKEIND-UHFFFAOYSA-N
 Ligand Interaction
NA
Query on NA

Download Ideal Coordinates CCD File 
A, B, C, D, E, F, G, H, I, J
SODIUM ION
Na
FKNQFGJONOIPTF-UHFFFAOYSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.40 Å
  • R-Value Free: 0.231 
  • R-Value Work: 0.225 
  • R-Value Observed: 0.225 
  • Space Group: P 21 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 120.214α = 90
b = 125.229β = 90
c = 211.577γ = 90
Software Package:
Software NamePurpose
REFMACrefinement
MOSFLMdata reduction
CCP4data scaling
AMoREphasing

Structure Validation

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Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2006-12-05
    Type: Initial release
  • Version 1.1: 2008-04-30
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Advisory, Version format compliance
  • Version 1.3: 2011-09-28
    Changes: Database references
  • Version 1.4: 2012-05-23
    Changes: Non-polymer description