4QID

Crystal structure of Haloquadratum walsbyi bacteriorhodopsin

• PDB DOI: https://doi.org/10.2210/pdb4QID/pdb

• Classification: MEMBRANE PROTEIN
• Organism(s): Haloquadratum walsbyi DSM 16790
• Expression System: Escherichia coli
• Mutation(s): No 
• Membrane Protein: Yes  PDBTMMemProtMDmpstruc


• Deposited: 2014-05-30 Released: 2015-07-29 
• Deposition Author(s): Wang, A.H.J., Hsu, M.F., Yang, C.S., Fu, H.Y.

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 2.57 Å
• R-Value Free: 
  0.229 (Depositor), 0.221 (DCC) 
• R-Value Work: 
  0.207 (Depositor), 0.200 (DCC) 
• R-Value Observed: 
  0.208 (Depositor) 

Literature

An acid-tolerant light-driven proton pump

Wang, A.H.J., Hsu, M.F., Yang, C.S., Fu, H.Y., Cai, C.J., Yi, H.P.

To be published.

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: 58.02 kDa 
• Atom Count: 3,661 
• Modelled Residue Count: 452 
• Deposited Residue Count: 524 
• Unique protein chains: 1

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
Bacteriorhodopsin-I	A, B	262	Haloquadratum walsbyi DSM 16790	Mutation(s): 0  Gene Names: bop1, bopI, HQ_1014A Membrane Entity: Yes
UniProt
Find proteins for Q18DH8 (Haloquadratum walsbyi (strain DSM 16790 / HBSQ001)) Explore Q18DH8  Go to UniProtKB:  Q18DH8

Small Molecules

Ligands 3 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram
MPG	G [auth B]	[(Z)-octadec-9-enyl] (2R)-2,3-bis(oxidanyl)propanoate C21 H40 O4 JPJYKWFFJCWMPK-GDCKJWNLSA-N
RET	C [auth A], F [auth B]	RETINAL C20 H28 O NCYCYZXNIZJOKI-OVSJKPMPSA-N
ACT	D [auth A], E [auth A]	ACETATE ION C2 H3 O2 QTBSBXVTEAMEQO-UHFFFAOYSA-M

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 2.57 Å
• R-Value Free:  0.229 (Depositor), 0.221 (DCC) 
• R-Value Work:  0.207 (Depositor), 0.200 (DCC) 
• R-Value Observed: 0.208 (Depositor) 

Space Group: C 1 2 1

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 131.939	α = 90
b = 29.799	β = 118.76
c = 124.973	γ = 90

Software Package:

Software Name	Purpose
HKL-2000	data collection
PHASER	phasing
REFMAC	refinement
HKL-2000	data reduction
HKL-2000	data scaling

Structure Validation

Entry History 

Deposition Data

• Released Date: 2015-07-29 
Deposition Author(s): Wang, A.H.J., Hsu, M.F., Yang, C.S., Fu, H.Y.

Revision History  

• Version 1.0: 2015-07-29
  Type: Initial release
  
• Version 1.1: 2024-10-30
  Changes: Data collection, Database references, Derived calculations, Structure summary