Biological Assembly 1  

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

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

Biological assembly 1 assigned by authors.

Macromolecule Content

• Total Structure Weight: 14.36 kDa 
• Atom Count: 1010 
• Modelled Residue Count: 123 
• Deposited Residue Count: 123 
• Unique protein chains: 1

2KSC

Solution structure of Synechococcus sp. PCC 7002 hemoglobin

• PDB DOI: 10.2210/pdb2KSC/pdb
• BMRB: 16306

• Classification: UNKNOWN FUNCTION
• Organism(s): Synechococcus sp. PCC 7002
• Expression System: Escherichia coli
• Mutation(s): No 


• Deposited: 2010-01-02 Released: 2010-02-09 
• Deposition Author(s): Vuletich, D.A., Falzone, C.J., Lecomte, J.T.J.

---

Experimental Data Snapshot

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

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

• PubMed: 20669934 
• DOI: 10.1021/bi100463d
• Primary Citation of Related Structures:  
  2KSC


• 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 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

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
Cyanoglobin	A	123	Synechococcus sp. PCC 7002	Mutation(s): 0  Gene Names: glbN, SYNPCC7002_A1621
UniProt
Find proteins for Q8RT58 (Synechococcus sp. (strain ATCC 27264 / PCC 7002 / PR-6)) Explore Q8RT58  Go to UniProtKB:  Q8RT58

Small Molecules

Ligands 1 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram
HEB	B [auth A]	HEME B/C C34 H34 Fe N4 O4 NEGHHAJBRZGUAY-ICENSXKYDL

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

Entry History 

Deposition Data

• Deposited Date: 2010-01-02 
• Released Date: 2010-02-09 
Deposition Author(s): Vuletich, D.A., Falzone, C.J., Lecomte, J.T.J.

Revision History  

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