Biological Assembly 1  

 3D View: Structure | 1D-3D View | Electron Density | Validation Report | Ligand Interaction

Global Symmetry: Asymmetric - C1 
Global Stoichiometry: Monomer - A1 

Biological assembly 1 assigned by authors.

Biological Assembly 2  

 3D View: Structure | 1D-3D View | Electron Density | Validation Report | Ligand Interaction

Global Symmetry: Cyclic - C2  (3D View)
Global Stoichiometry: Homo 2-mer - A2 

Biological assembly 2 generated by PISA (software)

Biological Assembly 3  

 3D View: Structure | 1D-3D View | Electron Density | Validation Report | Ligand Interaction

Global Symmetry: Cyclic - C2  (3D View)
Global Stoichiometry: Homo 2-mer - A2 

Biological assembly 3 generated by PISA,PQS (software)

Macromolecule Content

• Total Structure Weight: 12.54 kDa 
• Atom Count: 989 
• Modelled Residue Count: 109 
• Deposited Residue Count: 109 
• Unique protein chains: 1

1N9L

Crystal structure of the Phot-LOV1 domain from Chlamydomonas reinhardtii in the dark state.

• PDB DOI: 10.2210/pdb1N9L/pdb

• Classification: ELECTRON TRANSPORT
• Organism(s): Chlamydomonas reinhardtii
• Expression System: Escherichia coli BL21
• Mutation(s): No 


• Deposited: 2002-11-25 Released: 2003-06-17 
• Deposition Author(s): Fedorov, R., Schlichting, I., Hartmann, E., Domratcheva, T., Fuhrmann, M., Hegemann, P.

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 1.90 Å
• R-Value Free: 0.248 
• R-Value Work: 0.232 
• R-Value Observed: 0.233 

Literature

Crystal structures and molecular mechanism of a light-induced signaling switch: The Phot-LOV1 domain from Chlamydomonas reinhardtii.

Fedorov, R., Schlichting, I., Hartmann, E., Domratcheva, T., Fuhrmann, M., Hegemann, P.

(2003) Biophys J 84: 2474-2482

• PubMed: 12668455 
• DOI: 10.1016/S0006-3495(03)75052-8
• Primary Citation of Related Structures:  
  1N9L, 1N9N, 1N9O


• PubMed Abstract: 
  

Phot proteins (phototropins and homologs) are blue-light photoreceptors that control mechanical processes like phototropism, chloroplast relocation, or guard-cell opening in plants. Phot receptors consist of two flavin mononucleotide (FMN)-binding light, oxygen, or voltage (LOV) domains and a C-terminal serine/threonine kinase domain. We determined crystal structures of the LOV1 domain of Phot1 from the green alga Chlamydomonas reinhardtii in the dark and illuminated state to 1.9 A and 2.8 A resolution, respectively. The structure resembles that of LOV2 from Adiantum (Crosson, S. and K. Moffat. 2001. PROC: Natl. Acad. Sci. USA. 98:2995-3000). In the resting dark state of LOV1, the reactive Cys-57 is present in two conformations. Blue-light absorption causes formation of a proposed active signaling state that is characterized by a covalent bond between the flavin C4a and the thiol of Cys-57. There are differences around the FMN chromophore but no large overall conformational changes. Quantum chemical calculations based on the crystal structures revealed the electronic distribution in the active site during the photocycle. The results suggest trajectories for electrons, protons, and the active site cysteine and offer an interpretation of the reaction mechanism.

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Organizational Affiliation: 

Max Planck Institut für Molekulare Physiologie, Abteilung Biophysikalische Chemie, 44227 Dortmund, Germany.

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
putative blue light receptor	A	109	Chlamydomonas reinhardtii	Mutation(s): 0  Gene Names: PHOT, CHLRE_03g199000v5, CHLREDRAFT_183965 EC: 2.7.11.1
UniProt
Find proteins for Q8LPD9 (Chlamydomonas reinhardtii) Explore Q8LPD9  Go to UniProtKB:  Q8LPD9

Small Molecules

Ligands 2 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram
FMN	C [auth A]	FLAVIN MONONUCLEOTIDE C17 H21 N4 O9 P FVTCRASFADXXNN-SCRDCRAPSA-N
SO4	B [auth A]	SULFATE ION O4 S QAOWNCQODCNURD-UHFFFAOYSA-L

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 1.90 Å
• R-Value Free: 0.248 
• R-Value Work: 0.232 
• R-Value Observed: 0.233 
• Space Group: P 6₅ 2 2

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 122.1	α = 90
b = 122.1	β = 90
c = 46.1	γ = 120

Software Package:

Software Name	Purpose
ProDC	data collection
XDS	data reduction
AMoRE	phasing
CNS	refinement
XDS	data scaling

Structure Validation

Entry History 

Deposition Data

• Deposited Date: 2002-11-25 
• Released Date: 2003-06-17 
Deposition Author(s): Fedorov, R., Schlichting, I., Hartmann, E., Domratcheva, T., Fuhrmann, M., Hegemann, P.

Revision History  

• Version 1.0: 2003-06-17
  Type: Initial release
  
• Version 1.1: 2008-04-28
  Changes: Version format compliance
• Version 1.2: 2011-07-13
  Changes: Derived calculations, Version format compliance
• Version 1.3: 2017-10-11
  Changes: Refinement description
• Version 1.4: 2019-11-06
  Changes: Data collection, Database references