1A7E

HYDROXOMET MYOHEMERYTHRIN FROM THEMISTE ZOSTERICOLA

• PDB DOI: https://doi.org/10.2210/pdb1A7E/pdb

• Classification: OXYGEN TRANSPORT
• Organism(s): Themiste hennahi
• Expression System: Escherichia coli BL21(DE3)
• Mutation(s): Yes 


• Deposited: 1998-03-12 Released: 1998-10-14 
• Deposition Author(s): Martins, L.J., Hill, C.P., Ellis Junior, W.R.

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 1.80 Å
• R-Value Free: 0.227 
• R-Value Work: 0.186 
• R-Value Observed: 0.186 

Literature

Structures of wild-type chloromet and L103N hydroxomet Themiste zostericola myohemerythrins at 1.8 A resolution.

Martins, L.J., Hill, C.P., Ellis Jr., W.R.

(1997) Biochemistry 36: 7044-7049

• PubMed: 9188702 
• DOI: https://doi.org/10.1021/bi9630422
• Primary Citation of Related Structures:  
  1A7D, 1A7E


• PubMed Abstract: 
  

  Myohemerythrin (Mhr) is a nonheme iron oxygen carrier found in the retractor muscles of marine "peanut" worms. The X-ray crystal structures of two recombinant Themiste zostericola Mhrs are reported to a resolution of 1.8 A. Surprisingly, the met wild-type structure (R = 17.8%) was found to contain chloride bound to Fe2, while coordinated hydroxide was found in the met L103N structure (R = 18.3%). An internal water molecule was also found distal to the Fe-O-Fe center of the mutant protein, forming hydrogen bonds with the coordinated hydroxide and the OD1 atom of Asn-103. This finding is consistent with the kinetic and spectroscopic results reported for the L103N mutant Mhr [Raner, G. M., Martins, L. J., & Ellis, W. R., Jr. (1997) Biochemistry 36, 7037-7043]. Possible roles for the side chain of residue 103 (Leu in wild-type Mhr) in gating ligand binding are also discussed.

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Organizational Affiliation: 

Department of Chemistry, University of Utah, Salt Lake City 84112, USA.

Biological Assembly 1  

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

Biological assembly 1 assigned by authors.

Macromolecule Content

• Total Structure Weight: 14.02 kDa 
• Atom Count: 1,183 
• Modelled Residue Count: 118 
• Deposited Residue Count: 118 
• Unique protein chains: 1

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
MYOHEMERYTHRIN	A	118	Themiste hennahi	Mutation(s): 1
UniProt
Find proteins for P02247 (Themiste hennahi) Explore P02247  Go to UniProtKB:  P02247

Small Molecules

Ligands 2 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram
OFO	D [auth A]	HYDROXY DIIRON-OXO MOIETY Fe2 H O2 HLBQEWFJZLSCMX-UHFFFAOYSA-M
CL	B [auth A], C [auth A]	CHLORIDE ION Cl VEXZGXHMUGYJMC-UHFFFAOYSA-M

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 1.80 Å
• R-Value Free: 0.227 
• R-Value Work: 0.186 
• R-Value Observed: 0.186 
• Space Group: P 2₁ 2₁ 2₁

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 41.885	α = 90
b = 81.17	β = 90
c = 36.685	γ = 90

Software Package:

Software Name	Purpose
X-PLOR	model building
X-PLOR	refinement
R-AXIS	data reduction
R-AXIS	data scaling
X-PLOR	phasing

Structure Validation

Entry History 

Deposition Data

• Released Date: 1998-10-14 
Deposition Author(s): Martins, L.J., Hill, C.P., Ellis Junior, W.R.

Revision History  

• Version 1.0: 1998-10-14
  Type: Initial release
  
• Version 1.1: 2008-03-24
  Changes: Version format compliance
• Version 1.2: 2011-07-13
  Changes: Version format compliance
• Version 1.3: 2021-11-03
  Changes: Database references, Derived calculations, Other
• Version 1.4: 2024-02-07
  Changes: Data collection