Anabaena Apo-C-Terminal Domain Homolog Protein

Experimental Data Snapshot

  • Resolution: 2.75 Å
  • R-Value Free: 0.292 
  • R-Value Work: 0.241 
  • R-Value Observed: 0.246 

wwPDB Validation   3D Report Full Report

This is version 1.2 of the entry. See complete history


Structural rearrangements in the C-terminal domain homolog of Orange Carotenoid Protein are crucial for carotenoid transfer.

Harris, D.Wilson, A.Muzzopappa, F.Sluchanko, N.N.Friedrich, T.Maksimov, E.G.Kirilovsky, D.Adir, N.

(2018) Commun Biol 1: 125-125

  • DOI: https://doi.org/10.1038/s42003-018-0132-5
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 

    A recently reported family of soluble cyanobacterial carotenoproteins, homologs of the C-terminal domain (CTDH) of the photoprotective Orange Carotenoid Protein, is suggested to mediate carotenoid transfer from the thylakoid membrane to the Helical Carotenoid Proteins, which are paralogs of the N-terminal domain of the OCP. Here we present the three-dimensional structure of a carotenoid-free CTDH variant from Anabaena ( Nostoc ) PCC 7120. This CTDH contains a cysteine residue at position 103. Two dimer-forming interfaces were identified, one stabilized by a disulfide bond between monomers and the second between each monomer's β-sheets, both compatible with small-angle X-ray scattering data and likely representing intermediates of carotenoid transfer processes. The crystal structure revealed a major positional change of the C-terminal tail. Further mutational analysis revealed the importance of the C-terminal tail in both carotenoid uptake and delivery. These results have allowed us to suggest a detailed model for carotenoid transfer via these soluble proteins.

  • Organizational Affiliation

    Schulich Faculty of Chemistry, Technion, 3200003, Haifa, Israel.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
All4940 protein
A, B
124Nostoc sp. PCC 7120 = FACHB-418Mutation(s): 0 
Gene Names: all4940
Find proteins for Q8YMJ3 (Nostoc sp. (strain PCC 7120 / SAG 25.82 / UTEX 2576))
Explore Q8YMJ3 
Go to UniProtKB:  Q8YMJ3
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ8YMJ3
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Resolution: 2.75 Å
  • R-Value Free: 0.292 
  • R-Value Work: 0.241 
  • R-Value Observed: 0.246 
  • Space Group: P 65 2 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 81.08α = 90
b = 81.08β = 90
c = 162.943γ = 120
Software Package:
Software NamePurpose
SCALAdata scaling
PDB_EXTRACTdata extraction
iMOSFLMdata reduction

Structure Validation

View Full Validation Report

Entry History & Funding Information

Deposition Data

Funding OrganizationLocationGrant Number
IsraelISF 843/16

Revision History  (Full details and data files)

  • Version 1.0: 2018-07-18
    Type: Initial release
  • Version 1.1: 2019-10-09
    Changes: Data collection, Database references
  • Version 1.2: 2024-01-17
    Changes: Data collection, Database references, Refinement description