2KSC

Solution structure of Synechococcus sp. PCC 7002 hemoglobin


Experimental Data Snapshot

  • Method: SOLUTION NMR
  • Conformers Calculated: 30 
  • Conformers Submitted: 16 
  • Selection Criteria: structures with the least restraint violations 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

Functional and structural characterization of the 2/2 hemoglobin from Synechococcus sp. PCC 7002.

Scott, N.L.Xu, Y.Shen, G.Vuletich, D.A.Falzone, C.J.Li, Z.Ludwig, M.Pond, M.P.Preimesberger, M.R.Bryant, D.A.Lecomte, J.T.

(2010) Biochemistry 49: 7000-7011

  • DOI: 10.1021/bi100463d

  • PubMed Abstract: 
  • Cyanobacterium Synechococcus sp. PCC 7002 contains a single gene (glbN) coding for GlbN, a protein of the 2/2 hemoglobin lineage. The precise function of GlbN is not known, but comparison to similar 2/2 hemoglobins suggests that reversible dioxygen b ...

    Cyanobacterium Synechococcus sp. PCC 7002 contains a single gene (glbN) coding for GlbN, a protein of the 2/2 hemoglobin lineage. The precise function of GlbN is not known, but comparison to similar 2/2 hemoglobins suggests that reversible dioxygen binding is not its main activity. In this report, the results of in vitro and in vivo experiments probing the role of GlbN are presented. Transcription profiling indicated that glbN is not strongly regulated under any of a large number of growth conditions and that the gene is probably constitutively expressed. High levels of nitrate, used as the sole source of nitrogen, and exposure to nitric oxide were tolerated better by the wild-type strain than a glbN null mutant, whereas overproduction of GlbN in the null mutant background restored the wild-type growth. The cellular contents of reactive oxygen/nitrogen species were elevated in the null mutant under all conditions and were highest under NO challenge or in the presence of high nitrate concentrations. GlbN overproduction attenuated these contents significantly under the latter conditions. The analysis of cell extracts revealed that the heme of GlbN was covalently bound to overproduced GlbN apoprotein in cells grown under microoxic conditions. A peroxidase assay showed that purified GlbN does not possess significant hydrogen peroxidase activity. It was concluded that GlbN protects cells from reactive nitrogen species that could be encountered naturally during growth on nitrate or under denitrifying conditions. The solution structure of covalently modified GlbN was determined and used to rationalize some of its chemical properties.


    Related Citations: 
    • (1)H, (15)N, and (13)C resonance assignments of the 2/2 hemoglobin from the cyanobacterium Synechococcus sp. PCC 7002 in the ferric bis-histidine state
      Pond, M.P.,Vuletich, D.A.,Falzone, C.J.,Majumdar, A.,Lecomte, J.T.J.
      (2009) BIOMOL.NMR ASSIGN. 3: 211


    Organizational Affiliation

    Department of Chemistry, The Pennsylvania State University, University Park, Pennsylvania 16802, USA.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Cyanoglobin
A
123Synechococcus sp. (strain ATCC 27264 / PCC 7002 / PR-6)Mutation(s): 0 
Gene Names: glbN
Find proteins for Q8RT58 (Synechococcus sp. (strain ATCC 27264 / PCC 7002 / PR-6))
Go to UniProtKB:  Q8RT58
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
HEB
Query on HEB

Download SDF File 
Download CCD File 
A
HEME B/C
HYBRID BETWEEN B AND C TYPE HEMES (PROTOPORPHYRIN IX CONTAINING FE)
C34 H34 Fe N4 O4
NEGHHAJBRZGUAY-ICENSXKYDL
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: SOLUTION NMR
  • Conformers Calculated: 30 
  • Conformers Submitted: 16 
  • Selection Criteria: structures with the least restraint violations 
  • Olderado: 2KSC Olderado

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2010-02-09
    Type: Initial release
  • Version 1.1: 2011-07-13
    Type: Version format compliance
  • Version 1.2: 2020-02-26
    Type: Data collection, Database references, Derived calculations, Other