1MWB

Solution structure of the recombinant hemoglobin from the cyanobacterium Synechocystis sp. PCC 6803 in its hemichrome state


Experimental Data Snapshot

  • Method: SOLUTION NMR
  • Conformers Calculated: 100 
  • Conformers Submitted: 20 
  • Selection Criteria: structures with lowest energy and least restraint violations 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

The Solution Structure of the Recombinant Hemoglobin from the Cyanobacterium Synechocystis sp. PCC 6803 in its Hemichrome State

Falzone, C.J.Vu, B.C.Scott, N.L.Lecomte, J.T.

(2002) J.MOL.BIOL. 324: 1015-1029


  • PubMed Abstract: 
  • The product of the cyanobacterium Synechocystis sp. PCC 6803 gene slr2097 is a 123 amino acid polypeptide chain belonging to the truncated hemoglobin family. Recombinant, ferric heme-reconstituted Synechocystis sp. PCC 6803 hemoglobin displays bis-hi ...

    The product of the cyanobacterium Synechocystis sp. PCC 6803 gene slr2097 is a 123 amino acid polypeptide chain belonging to the truncated hemoglobin family. Recombinant, ferric heme-reconstituted Synechocystis sp. PCC 6803 hemoglobin displays bis-histidine coordination of the iron ion. In addition, this protein is capable of covalently attaching a reactive histidine to the heme 2-vinyl group. The structure of the protein in the low-spin ferric state with intact vinyl substituents was solved by NMR methods. It was found that the structure differs from that of known truncated hemoglobins primarily in the orientation of the E helix, which carries His46 (E10) as the distal ligand to the iron; the length and orientation of the F helix, which carries His70 (F8) as the proximal ligand to the iron; and the H-helix, which carries His117 (H16), the reactive histidine. Regions of enhanced flexibility include the short A helix, the loop connecting the E and F helices, and the last seven residues at the carboxy end. The structural data allowed for the rationalization of physical properties of the cyanobacterial protein, such as fast on-rate for small ligand binding, unstable apoprotein fold, and cross-linking ability. Comparison to the truncated hemoglobin from the green alga Chlamydomonas eugametos also suggested how the endogenous hexacoordination affected the structure.


    Related Citations: 
    • Cloning, Expression, Purification, and Preliminary Characterization of a Putative Hemoglobin from the Cyanobacterium Synechocystis sp. PCC 6803
      Scott, N.L.,Lecomte, J.T.
      (2000) Protein Sci. 9: 587
    • Assignment of the 1H, 13C, and 15N Signals of Synechocystis sp. PCC 6803 Methemoglobin
      Falzone, C.J.,Lecomte, J.T.
      (2002) J.Biomol.NMR 23: 71


    Organizational Affiliation

    Department of Chemistry and the Center for Biomolecular Structure and Function, The Pennsylvania State University, University Park, PA 16802, USA. cxf14@psu.edu




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Cyanoglobin
A
123Synechocystis sp. (strain PCC 6803 / Kazusa)Gene Names: glbN
Find proteins for P73925 (Synechocystis sp. (strain PCC 6803 / Kazusa))
Go to UniProtKB:  P73925
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
HEM
Query on HEM

Download SDF File 
Download CCD File 
A
PROTOPORPHYRIN IX CONTAINING FE
HEME
C34 H32 Fe N4 O4
KABFMIBPWCXCRK-RGGAHWMASA-L
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: SOLUTION NMR
  • Conformers Calculated: 100 
  • Conformers Submitted: 20 
  • Selection Criteria: structures with lowest energy and least restraint violations 
  • Olderado: 1MWB Olderado

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2002-12-04
    Type: Initial release
  • Version 1.1: 2008-04-28
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Source and taxonomy, Version format compliance