2C0K

The structure of hemoglobin from the botfly Gasterophilus intestinalis

Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.60 Å
  • R-Value Free: 0.256 
  • R-Value Work: 0.186 
  • R-Value Observed: 0.193 

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This is version 1.2 of the entry. See complete history. 


Literature

Modulation of Oxygen Binding to Insect Hemoglobins: The Structure of Hemoglobin from the Botfly Gasterophilus Intestinalis.

Pesce, A., Nardini, M., Dewilde, S., Hoogewijs, D., Ascenzi, P., Moens, L., Bolognesi, M.

(2005) Protein Sci 14: 3057

  • DOI: 10.1110/ps.051742605
  • Primary Citation of Related Structures:  
    2C0K

  • PubMed Abstract: 

    • Hemoglobins (Hbs) reversibly bind gaseous diatomic ligands (e.g., O2) as the sixth heme axial ligand of the penta-coordinate deoxygenated form. Selected members of the Hb superfamily, however, display a functionally relevant hexa-coordinate heme Fe atom in their deoxygenated state ...

    Hemoglobins (Hbs) reversibly bind gaseous diatomic ligands (e.g., O2) as the sixth heme axial ligand of the penta-coordinate deoxygenated form. Selected members of the Hb superfamily, however, display a functionally relevant hexa-coordinate heme Fe atom in their deoxygenated state. Endogenous heme hexa-coordination is generally provided in these Hbs by the E7 residue (often His), which thus modulates accessibility to the heme distal pocket and reactivity of the heme toward exogenous ligands. Such a pivotal role of the E7 residue is prominently shown by analysis of the functional and structural properties of insect Hbs. Here, we report the 2.6 A crystal structure of oxygenated Gasterophilus intestinalis Hb1, a Hb known to display a penta-coordinate heme in the deoxygenated form. The structure is analyzed in comparison with those of Drosophila melanogaster Hb, exhibiting a hexa-coordinate heme in its deoxygenated derivative, and of Chironomus thummi thummi HbIII, which displays a penta-coordinate heme in the deoxygenated form. Despite evident structural differences in the heme distal pockets, the distinct molecular mechanisms regulating O2 binding to the three insect Hbs result in similar O(2 affinities (P50 values ranging between 0.12 torr and 0.46 torr).

    Organizational Affiliation: 

    Department of Biomolecular Sciences and Biotechnology, University of Milano, Via Celoria 26, I-20131 Milano, Italy.



Macromolecules
Find similar proteins by: 
(by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
HEMOGLOBIN A, B151Gasterophilus intestinalisMutation(s): 0 
Gene Names: glob1
Find proteins for O96457 (Gasterophilus intestinalis)
Explore O96457 
Go to UniProtKB:  O96457
Protein Feature View
Expand
  • Reference Sequence
Small Molecules
Ligands 2 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
HEM
Query on HEM
Download Ideal Coordinates CCD File 
A, B
PROTOPORPHYRIN IX CONTAINING FE
C34 H32 Fe N4 O4
KABFMIBPWCXCRK-RGGAHWMASA-L		 Ligand Interaction
OXY
Query on OXY
Download Ideal Coordinates CCD File 
A, B
OXYGEN MOLECULE
O2
MYMOFIZGZYHOMD-UHFFFAOYSA-N		 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.60 Å
  • R-Value Free: 0.256 
  • R-Value Work: 0.186 
  • R-Value Observed: 0.193 
  • Space Group: P 31
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 47.697α = 90
b = 47.697β = 90
c = 145.245γ = 120
Software Package:
Software NamePurpose
REFMACrefinement
MOSFLMdata reduction
SCALAdata scaling
MOLREPphasing

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2005-11-09
    Type: Initial release
  • Version 1.1: 2011-05-08
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Version format compliance