9R4U | pdb_00009r4u

Crystal structure of CtGH76 from Chaetomium thermophilum in complex with isomaltose

• PDB DOI: https://doi.org/10.2210/pdb9R4U/pdb

• Classification: HYDROLASE
• Organism(s): Thermochaetoides thermophila DSM 1495
• Expression System: Escherichia coli B
• Mutation(s): No 


• Deposited: 2025-05-07 Released: 2025-07-16 
• Deposition Author(s): Po-Hsun, W., Essen, L.-O.
• Funding Organization(s): German Research Foundation (DFG)

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 1.96 Å
• R-Value Free: 
  0.208 (Depositor), 0.207 (DCC) 
• R-Value Work: 
  0.183 (Depositor), 0.182 (DCC) 
• R-Value Observed: 
  0.184 (Depositor) 

Starting Model: experimental

Literature

CtGH76, a Glycoside Hydrolase 76 from Chaetomium thermophilum, with Elongated Glycan-Binding Canyon

Ruppenthal, S.R., Po-Hsun, W., Watad, M., Rosner, C.J., Vogt, M.S., Friedrich, M., Voigt, A.L., Petz, A., Gnau, P., Essen, L.-O.

(2025) Int J Mol Sci 26

• DOI: https://doi.org/10.3390/ijms26146589

Biological Assembly 1  

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

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

Biological Assembly Evidence: gel filtration

Macromolecule Content 

• Total Structure Weight: 48.84 kDa 
• Atom Count: 3,019 
• Modeled Residue Count: 362 
• Deposited Residue Count: 439 
• Unique protein chains: 1

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
Uncharacterized protein	A	439	Thermochaetoides thermophila DSM 1495	Mutation(s): 0  Gene Names: CTHT_0025410
UniProt
Find proteins for G0S5Y9 (Chaetomium thermophilum (strain DSM 1495 / CBS 144.50 / IMI 039719)) Explore G0S5Y9  Go to UniProtKB:  G0S5Y9

Oligosaccharides

Help

Entity ID: 2
Molecule	Chains	Length	2D Diagram	Glycosylation	3D Interactions
beta-D-glucopyranose-(1-6)-beta-D-glucopyranose	B	2		N/A

Small Molecules

Ligands 3 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram
BGC (Subject of Investigation/LOI)	C [auth A]	beta-D-glucopyranose C6 H12 O6 WQZGKKKJIJFFOK-VFUOTHLCSA-N
GOL (Subject of Investigation/LOI)	D [auth A], E [auth A]	GLYCEROL C3 H8 O3 PEDCQBHIVMGVHV-UHFFFAOYSA-N
FMT (Subject of Investigation/LOI)	F [auth A]	FORMIC ACID C H2 O2 BDAGIHXWWSANSR-UHFFFAOYSA-N

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 1.96 Å
• R-Value Free:  0.208 (Depositor), 0.207 (DCC) 
• R-Value Work:  0.183 (Depositor), 0.182 (DCC) 
• R-Value Observed: 0.184 (Depositor) 

Space Group: P 3₁ 2 1

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 106.973	α = 90
b = 106.973	β = 90
c = 126.835	γ = 120

Software Package:

Software Name	Purpose
PHENIX	refinement
XDS	data reduction
Aimless	data scaling
PHASER	phasing

Structure Validation

Entry History & Funding Information

Deposition Data

• Released Date: 2025-07-16 
Deposition Author(s): Po-Hsun, W., Essen, L.-O.

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Funding Organization	Location	Grant Number
German Research Foundation (DFG)	Germany	SFB 987

Revision History  

• Version 1.0: 2025-07-16
  Type: Initial release