1P8H

BACTERIORHODOPSIN M1 INTERMEDIATE PRODUCED AT ROOM TEMPERATURE


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.52 Å
  • R-Value Free: 0.207 
  • R-Value Observed: 0.175 

Starting Model: experimental
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This is version 1.4 of the entry. See complete history


Literature

Crystallographic Structures of the M and N Intermediates of Bacteriorhodopsin: Assembly of a Hydrogen-Bonded Chain of Water Molecules between Asp-96 and the Retinal Schiff Base

Schobert, B.Brown, L.S.Lanyi, J.K.

(2003) J Mol Biol 330: 553-570

  • DOI: https://doi.org/10.1016/s0022-2836(03)00576-x
  • Primary Citation of Related Structures:  
    1P8H, 1P8I, 1P8U

  • PubMed Abstract: 

    An M intermediate of wild-type bacteriorhodopsin and an N intermediate of the V49A mutant were accumulated in photostationary states at pH 5.6 and 295 K, and their crystal structures determined to 1.52A and 1.62A resolution, respectively. They appear to be M(1) and N' in the sequence, M(1)<-->M(2)<-->M'(2)<-->N<-->N'-->O-->BR, where M(1), M(2), and M'(2) contain an unprotonated retinal Schiff base before and after a reorientation switch and after proton release to the extracellular surface, while N and N' contain a reprotonated Schiff base, before and after reprotonation of Asp96 from the cytoplasmic surface. In M(1), we detect a cluster of three hydrogen-bonded water molecules at Asp96, not present in the BR state. In M(2), whose structure we reported earlier, one of these water molecules intercalates between Asp96 and Thr46. In N', the cluster is transformed into a single-file hydrogen-bonded chain of four water molecules that connects Asp96 to the Schiff base. We find a network of three water molecules near residue 219 in the crystal structure of the non-illuminated F219L mutant, where the residue replacement creates a cavity. This suggests that the hydration of the cytoplasmic region we observe in N' might have occurred spontaneously, beginning at an existing water molecule as nucleus, in the cavities from residue rearrangements in the photocycle.


  • Organizational Affiliation

    Department of Physiology and Biophysics, University of California, D345 Medical Science I, Irvine, CA 92697, USA.


Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Bacteriorhodopsin249Halobacterium salinarumMutation(s): 0 
Gene Names: BOP
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]
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: 1.52 Å
  • R-Value Free: 0.207 
  • R-Value Observed: 0.175 
  • Space Group: P 63
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 60.907α = 90
b = 60.907β = 90
c = 108.574γ = 120
Software Package:
Software NamePurpose
DENZOdata reduction
SCALEPACKdata scaling
SHELXL-97model building
SHELXL-97refinement
SHELXL-97phasing

Structure Validation

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Entry History 

Deposition Data

  • Released Date: 2003-07-07 
  • Deposition Author(s): Lanyi, J.K.

Revision History  (Full details and data files)

  • Version 1.0: 2003-07-07
    Type: Initial release
  • Version 1.1: 2008-04-29
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Derived calculations, Version format compliance
  • Version 1.3: 2023-08-16
    Changes: Data collection, Database references, Derived calculations, Refinement description
  • Version 1.4: 2024-10-09
    Changes: Structure summary