6J4D

Crystal structure of MarH, an epimerase for biosynthesis of Maremycins in Streptomyces, under pH 4.7, without Zn

• PDB DOI: https://doi.org/10.2210/pdb6J4D/pdb

• Classification: ISOMERASE
• Organism(s): Streptomyces sp. B9173
• Expression System: Escherichia coli
• Mutation(s): No 


• Deposited: 2019-01-08 Released: 2020-01-15 
• Deposition Author(s): Hou, Y., Liu, B., Hu, K., Zhang, R.
• Funding Organization(s): National Basic Research Program of China (973 Program), National Natural Science Foundation of China

---

Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 1.40 Å
• R-Value Free: 
  0.167 (Depositor), 0.170 (DCC) 
• R-Value Work: 
  0.145 (Depositor), 0.150 (DCC) 
• R-Value Observed: 
  0.146 (Depositor) 

Literature

Structural Basis for the Isomerization Mechanism of MarH

Liu, B., Hou, Y., Zhang, R., Hu, K.

To be published.

Biological Assembly 1  

Global Symmetry: Cyclic - C2  (Explore in 3D)
Global Stoichiometry: Homo 2-mer - A2 

Biological assembly 1 assigned by authors and generated by PISA (software)

Biological Assembly Evidence: gel filtration

Macromolecule Content

• Total Structure Weight: 13.6 kDa 
• Atom Count: 1,047 
• Modelled Residue Count: 122 
• Deposited Residue Count: 126 
• Unique protein chains: 1

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
Cupin superfamily protein	A	126	Streptomyces sp. B9173	Mutation(s): 0  Gene Names: marH
UniProt
Find proteins for X2D812 (Streptomyces sp. B9173) Explore X2D812  Go to UniProtKB:  X2D812

Small Molecules

Ligands 2 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram
FLC	B [auth A]	CITRATE ANION C6 H5 O7 KRKNYBCHXYNGOX-UHFFFAOYSA-K
GOL	C [auth A]	GLYCEROL C3 H8 O3 PEDCQBHIVMGVHV-UHFFFAOYSA-N

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 1.40 Å
• R-Value Free:  0.167 (Depositor), 0.170 (DCC) 
• R-Value Work:  0.145 (Depositor), 0.150 (DCC) 
• R-Value Observed: 0.146 (Depositor) 

Space Group: P 3₂ 2 1

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 43.425	α = 90
b = 43.425	β = 90
c = 98.383	γ = 120

Software Package:

Software Name	Purpose
REFMAC	refinement
HKL-2000	data scaling
PDB_EXTRACT	data extraction
HKL-2000	data reduction
MOLREP	phasing

Structure Validation

Entry History & Funding Information

Deposition Data

• Released Date: 2020-01-15 
Deposition Author(s): Hou, Y., Liu, B., Hu, K., Zhang, R.

---

Funding Organization	Location	Grant Number
National Basic Research Program of China (973 Program)	China	2017YFA0505800
National Basic Research Program of China (973 Program)	China	2017YFA0504300
National Natural Science Foundation of China	China	31570720

Revision History  

• Version 1.0: 2020-01-15
  Type: Initial release
  
• Version 1.1: 2024-03-27
  Changes: Data collection, Database references