9H4C | pdb_00009h4c

Crystal structure of the diheme 4D2 (mutant T19D) with bound Fe(III) mesoporphyrin IX

PDB DOI: https://doi.org/10.2210/pdb9H4C/pdb

Classification: DE NOVO PROTEIN
Organism(s): synthetic construct
Expression System: Escherichia coli
Mutation(s): No

Deposited: 2024-10-18 Released: 2025-12-03
Deposition Author(s): Barringer, R., Back, C., Anderson, R.
Funding Organization(s): Biotechnology and Biological Sciences Research Council (BBSRC)

Experimental Data Snapshot

Method: X-RAY DIFFRACTION
Resolution: 1.98 Å
R-Value Free:
0.254 (Depositor), 0.258 (DCC)
R-Value Work:
0.195 (Depositor), 0.197 (DCC)
R-Value Observed:
0.198 (Depositor)

Starting Model: experimental
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Literature

Crystal structure of the diheme 4D2 (mutant T19D) with bound Fe(III) mesoporphyrin IX

Mellor, C.

To be published.

Macromolecule Content

Total Structure Weight: 13.91 kDa
Atom Count: 920
Modeled Residue Count: 106
Deposited Residue Count: 112
Unique protein chains: 1

Macromolecules

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Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
4D2 (mutant T19D)	A	112	synthetic construct	Mutation(s): 0

Small Molecules

Ligands 1 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram	3D Interactions
MH0 (Subject of Investigation/LOI) Query on MH0 Download:Ideal Coordinates CCD File SDF format, chain C [auth A] SDF format, chain B [auth A] MOL2 format, chain C [auth A] MOL2 format, chain B [auth A] mmCIF format, chain C [auth A] mmCIF format, chain B [auth A]	B [auth A], C [auth A]	Mesoheme C₃₄ H₃₆ Fe N₄ O₄ CKMCSMAXNUVLQI-RGGAHWMASA-N		Interactions Focus chain B [auth A] Focus chain C [auth A] Interactions & Density Focus chain B [auth A] Focus chain C [auth A]

Experimental Data & Validation

Experimental Data

Method: X-RAY DIFFRACTION
Resolution: 1.98 Å
R-Value Free: 0.254 (Depositor), 0.258 (DCC)
R-Value Work: 0.195 (Depositor), 0.197 (DCC)
R-Value Observed: 0.198 (Depositor)

Space Group: H 3

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 81.187	α = 90
b = 81.187	β = 90
c = 58.817	γ = 120

Software Package:

Software Name	Purpose
REFMAC	refinement
xia2.multiplex	data reduction
xia2.multiplex	data scaling
MOLREP	phasing

Structure Validation

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Entry History

& Funding Information

Deposition Data

Released Date: 2025-12-03

Deposition Author(s):

Funding Organization	Location	Grant Number
Biotechnology and Biological Sciences Research Council (BBSRC)	United Kingdom	BB/W003449/1

Revision History (Full details and data files)

Version 1.0: 2025-12-03
Type: Initial release

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RCSB PDB Core Operations are funded by the U.S. National Science Foundation (DBI-2321666), the US Department of Energy (DE-SC0019749), and the National Cancer Institute, National Institute of Allergy and Infectious Diseases, and National Institute of General Medical Sciences of the National Institutes of Health under grant R01GM157729. RCSB PDB uses resources of the National Energy Research Scientific Computing Center (NERSC), a Department of Energy User Facility.