3OAX

Crystal structure of bovine rhodopsin with beta-ionone


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.6 Å
  • R-Value Free: 0.262 
  • R-Value Work: 0.224 

wwPDB Validation 3D Report Full Report


This is version 1.1 of the entry. See complete history

Literature

Binding of more than one retinoid to visual opsins

Makino, C.L.Riley, C.K.Looney, J.Crouch, R.K.Okada, T.

(2010) Biophys.J. 99: 2366-2373

  • DOI: 10.1016/j.bpj.2010.08.003

  • PubMed Abstract: 
  • Visual opsins bind 11-cis retinal at an orthosteric site to form rhodopsins but increasing evidence suggests that at least some are capable of binding an additional retinoid(s) at a separate, allosteric site(s). Microspectrophotometric measurements o ...

    Visual opsins bind 11-cis retinal at an orthosteric site to form rhodopsins but increasing evidence suggests that at least some are capable of binding an additional retinoid(s) at a separate, allosteric site(s). Microspectrophotometric measurements on isolated, dark-adapted, salamander photoreceptors indicated that the truncated retinal analog, β-ionone, partitioned into the membranes of green-sensitive rods; however, in blue-sensitive rod outer segments, there was an enhanced uptake of four or more β-ionones per rhodopsin. X-ray crystallography revealed binding of one β-ionone to bovine green-sensitive rod rhodopsin. Cocrystallization only succeeded with extremely high concentrations of β-ionone and binding did not alter the structure of rhodopsin from the inactive state. Salamander green-sensitive rod rhodopsin is also expected to bind β-ionone at sufficiently high concentrations because the binding site is present on its surface. Therefore, both blue- and green-sensitive rod rhodopsins have at least one allosteric binding site for retinoid, but β-ionone binds to the latter type of rhodopsin with low affinity and low efficacy.


    Organizational Affiliation

    Department of Ophthalmology, Massachusetts Eye and Ear Infirmary, Boston, MA, USA. cmakino@meei.harvard.edu




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Rhodopsin
A, B
349Bos taurusGene Names: RHO
Find proteins for P02699 (Bos taurus)
Go to Gene View: RHO
Go to UniProtKB:  P02699
Small Molecules
Ligands 11 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
ID3
Query on ID3

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A, B
(3E)-4-(2,6,6-trimethylcyclohex-1-en-1-yl)but-3-en-2-one
beta-ionone
C13 H20 O
PSQYTAPXSHCGMF-BQYQJAHWSA-N
 Ligand Interaction
ZN
Query on ZN

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A, B
ZINC ION
Zn
PTFCDOFLOPIGGS-UHFFFAOYSA-N
 Ligand Interaction
HTG
Query on HTG

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A, B
HEPTYL 1-THIOHEXOPYRANOSIDE
C13 H26 O5 S
HPEGNLMTTNTJSP-LBELIVKGSA-N
 Ligand Interaction
MAN
Query on MAN

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B
ALPHA-D-MANNOSE
C6 H12 O6
WQZGKKKJIJFFOK-PQMKYFCFSA-N
 Ligand Interaction
RET
Query on RET

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A, B
RETINAL
C20 H28 O
NCYCYZXNIZJOKI-OVSJKPMPSA-N
 Ligand Interaction
BMA
Query on BMA

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A, B
BETA-D-MANNOSE
C6 H12 O6
WQZGKKKJIJFFOK-RWOPYEJCSA-N
 Ligand Interaction
4E6
Query on 4E6

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A, B
(4E,6E)-hexadeca-1,4,6-triene
C16 H28
OPBISVRDVDRVHM-PTSVWTKZSA-N
 Ligand Interaction
HTO
Query on HTO

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B
HEPTANE-1,2,3-TRIOL
C7 H16 O3
HXYCHJFUBNTKQR-RNFRBKRXSA-N
 Ligand Interaction
NAG
Query on NAG

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A, B
N-ACETYL-D-GLUCOSAMINE
C8 H15 N O6
OVRNDRQMDRJTHS-FMDGEEDCSA-N
 Ligand Interaction
PLM
Query on PLM

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A, B
PALMITIC ACID
C16 H32 O2
IPCSVZSSVZVIGE-UHFFFAOYSA-N
 Ligand Interaction
HG
Query on HG

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A, B
MERCURY (II) ION
Hg
BQPIGGFYSBELGY-UHFFFAOYSA-N
 Ligand Interaction
Modified Residues  1 Unique
IDChainsTypeFormula2D DiagramParent
ACE
Query on ACE
A, B
NON-POLYMERC2 H4 O

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Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.6 Å
  • R-Value Free: 0.262 
  • R-Value Work: 0.224 
  • Space Group: P 41
Unit Cell:
Length (Å)Angle (°)
a = 96.990α = 90.00
b = 96.990β = 90.00
c = 149.800γ = 90.00
Software Package:
Software NamePurpose
CNSrefinement
SCALEPACKdata scaling
ADSCdata collection
AMoREphasing
HKL-2000data reduction

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2011-01-19
    Type: Initial release
  • Version 1.1: 2011-07-13
    Type: Version format compliance