2I1X

Bacteriorhodopsin/lipid complex, D96A mutant


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.00 Å
  • R-Value Free: 0.299 
  • R-Value Work: 0.238 
  • R-Value Observed: 0.239 

Starting Model: experimental
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wwPDB Validation   3D Report Full Report


This is version 1.5 of the entry. See complete history


Literature

Propagating Structural Perturbation Inside Bacteriorhodopsin: Crystal Structures of the M State and the D96A and T46V Mutants.

Lanyi, J.K.Schobert, B.

(2006) Biochemistry 45: 12003-12010

  • DOI: https://doi.org/10.1021/bi061310i
  • Primary Citation of Related Structures:  
    2I1X, 2I20, 2I21

  • PubMed Abstract: 

    The X-ray diffraction structure of the non-illuminated D96A bacteriorhodopsin mutant reveals structural changes as far away as 15 A from residue 96, at the retinal, Trp-182, Ala-215, and waters 501, 402, and 401. The Asp-to-Ala side-chain replacement breaks its hydrogen bond with Thr-46, and the resulting separation of the cytoplasmic ends of helices B and C is communicated to the retinal region through a chain of covalent and hydrogen bonds. The unexpected long-range consequences of the D96A mutation include breaking the hydrogen bond between O of Ala-215 and water 501 and the formation of a new hydrogen bond between water molecules 401 and 402 in the extracellular region. Because in the T46V mutant a new water molecule appears at Asp-96 and its hydrogen-bond to Ile-45 replaces Thr-46 as its link to helix B, the separation of helices B and C is smaller than that in D96A, and there are no atomic displacements elsewhere in the protein. Propagation of conformational changes along the chain between the retinal and Thr-46 had been observed earlier in the crystal structures of the D96N and E204Q mutants but in the trapped M state. Consistent with the perturbation of the retinal region in D96A, little change of the Thr-46 region occurs between the non-illuminated and M states of this mutant. It appears that a local perturbation can propagate along a track in both directions between the retinal and the Asp-96/Thr-46 pair, either from photoisomerization of the retinal in the wild-type protein in one case or from the D96A mutation in the other.


  • Organizational Affiliation

    Department of Physiology and Biophysics, University of California, Irvine, California 92697, USA. jlanyi@orion.oac.uci.edu


Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Bacteriorhodopsin249Halobacterium salinarumMutation(s): 1 
Membrane Entity: Yes 
UniProt
Find proteins for P02945 (Halobacterium salinarum (strain ATCC 700922 / JCM 11081 / NRC-1))
Explore P02945 
Go to UniProtKB:  P02945
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP02945
Sequence Annotations
Expand
  • Reference Sequence
Small Molecules
Ligands 3 Unique
IDChains Name / Formula / InChI Key2D Diagram3D Interactions
LI1
Query on LI1

Download Ideal Coordinates CCD File 
C [auth A]
D [auth A]
E [auth A]
F [auth A]
G [auth A]
C [auth A],
D [auth A],
E [auth A],
F [auth A],
G [auth A],
H [auth A],
I [auth A],
J [auth A],
K [auth A],
L [auth A],
M [auth A],
N [auth A],
O [auth A]
1-[2,6,10.14-TETRAMETHYL-HEXADECAN-16-YL]-2-[2,10,14-TRIMETHYLHEXADECAN-16-YL]GLYCEROL
C42 H86 O3
YERVUJAKCNBGCR-BIHSMRAKSA-N
SQU
Query on SQU

Download Ideal Coordinates CCD File 
P [auth A]2,10,23-TRIMETHYL-TETRACOSANE
C27 H56
ZADHKSJXSZBQFB-HHHXNRCGSA-N
RET
Query on RET

Download Ideal Coordinates CCD File 
B [auth A]RETINAL
C20 H28 O
NCYCYZXNIZJOKI-OVSJKPMPSA-N
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.00 Å
  • R-Value Free: 0.299 
  • R-Value Work: 0.238 
  • R-Value Observed: 0.239 
  • Space Group: P 63
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 60.952α = 90
b = 60.952β = 90
c = 109.326γ = 120
Software Package:
Software NamePurpose
SHELXmodel building
SHELXL-97refinement
ADSCdata collection
HKL-2000data reduction
HKL-2000data scaling
SHELXphasing

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2006-10-10
    Type: Initial release
  • Version 1.1: 2008-05-01
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Derived calculations, Version format compliance
  • Version 1.3: 2021-10-20
    Changes: Database references, Derived calculations
  • Version 1.4: 2023-08-30
    Changes: Data collection, Refinement description
  • Version 1.5: 2024-10-30
    Changes: Structure summary