2LHB

REFINEMENT OF A MOLECULAR MODEL FOR LAMPREY HEMOGLOBIN FROM PETROMYZON MARINUS


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2 Å
  • R-Value Work: 0.142 

wwPDB Validation 3D Report Full Report


This is version 1.3 of the entry. See complete history

Literature

Refinement of a molecular model for lamprey hemoglobin from Petromyzon marinus.

Honzatko, R.B.Hendrickson, W.A.Love, W.E.

(1985) J.Mol.Biol. 184: 147-164


  • PubMed Abstract: 
  • A molecular model for the protein and ambient solvent of the complex of cyanide with methemoglobin V from the sea lamprey Petromyzon marinus yields an R-factor of 0.142 against X-ray diffraction data to 2.0 A resolution. The root-mean-square discrepa ...

    A molecular model for the protein and ambient solvent of the complex of cyanide with methemoglobin V from the sea lamprey Petromyzon marinus yields an R-factor of 0.142 against X-ray diffraction data to 2.0 A resolution. The root-mean-square discrepancies from ideal bond length and angle are, respectively, 0.014 A and 1.5 degrees. Atoms that belong to planar groups deviate by 0.012 A from planes determined by a least-squares procedure. The average standard deviation for chiral volumes, peptide torsion angle and torsion angles of side-chains are 0.150 A3, 2.0 degrees and 19.4 degrees, respectively. The root-mean-square variation in the thermal parameters of bonded atoms of the polypeptide backbone is 1.21 A2; the variation in thermal parameters for side-chain atoms is 2.13 A2. The model includes multiple conformations for 11 side-chains of the 149 amino acid residues of the protein. We identify 231 locations as sites of water molecules in full or partial occupancy. The sum of occupancy factors for these sites is approximately 154, representing 28% of the 550 molecules of water within the crystallographic asymmetric unit. The environment of the heme in the cyanide complex of lamprey methemoglobin resembles the deoxy state of the mammalian tetramer. In particular, the bond between atom NE2 of the proximal histidine and the Fe lies 5.1 degrees from the normal of the heme plane. In deoxy- and carbonmonoxyhemoglobins, the deviations from the normal to the heme plane are 7 to 8 degrees and 1 degree, respectively. Furthermore, the inequality in the distance of atom CD2 of the proximal histidine from the pyrrole nitrogen of ring-C of the heme (distance = 3.29 A) and CE1 from the pyrrole nitrogen of ring-A (distance = 3.06 A) is characteristic of deoxyhemoglobin, not carbonmonoxyhemoglobin, where these distances are equal. Finally, a hydrogen bond exists between carbonyl 111 and the hydroxyl of tyrosine 149. The corresponding hydrogen link in the mammalian tetramer is central to the T to R state transition and is present in deoxyhemoglobin but absent in carbonmonoxyhemoglobin. We suggest that the low affinity of oxygen for lamprey hemoglobin may be a consequence of these T-state geometries.


    Related Citations: 
    • Crystal Structure Analysis of Sea Lamprey Hemoglobin at 2 Angstroms Resolution
      Hendrickson, W.A.,Love, W.E.,Karle, J.
      (1973) J.Mol.Biol. 74: 331
    • Structure of Lamprey Haemoglobin
      Hendrickson, W.A.,Love, W.E.
      (1971) Nature New Biol. 232: 197



Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
HEMOGLOBIN V (CYANO MET)
A
149Petromyzon marinusN/A
Find proteins for P02208 (Petromyzon marinus)
Go to UniProtKB:  P02208
Small Molecules
Ligands 2 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
CYN
Query on CYN

Download SDF File 
Download CCD File 
A
CYANIDE ION
C N
XFXPMWWXUTWYJX-UHFFFAOYSA-N
 Ligand Interaction
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: X-RAY DIFFRACTION
  • Resolution: 2 Å
  • R-Value Work: 0.142 
  • Space Group: P 21 21 21
Unit Cell:
Length (Å)Angle (°)
a = 44.570α = 90.00
b = 96.620β = 90.00
c = 31.340γ = 90.00

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 1986-01-21
    Type: Initial release
  • Version 1.1: 2008-03-03
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Atomic model, Version format compliance
  • Version 1.3: 2017-11-29
    Type: Derived calculations, Other