9QVQ | pdb_00009qvq

Crystal structure of the CtaG_H128A variant from Ruminiclostridium cellulolyticum in complex with PHBA (P2(1)-medium)

• PDB DOI: https://doi.org/10.2210/pdb9QVQ/pdb

• Classification: LIGASE
• Organism(s): Ruminiclostridium cellulolyticum
• Expression System: Escherichia coli BL21(DE3)
• Mutation(s): No 


• Deposited: 2025-04-11 Released: 2025-10-01 
• Deposition Author(s): Gude, F., Bohne, A., Dell, M., Franke, J., Dunbar, K.L., Groll, M., Hertweck, C.
• Funding Organization(s): German Research Foundation (DFG)

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 1.60 Å
• R-Value Free: 
  0.216 (Depositor), 0.222 (DCC) 
• R-Value Work: 
  0.185 (Depositor), 0.191 (DCC) 
• R-Value Observed: 
  0.186 (Depositor) 

Starting Model: experimental

Literature

Distal peptide elongation by a protease-like ligase and two distinct carrier proteins

Gude, F., Bohne, A., Dell, M., Franke, J., Dunbar, K.L., Groll, M., Hertweck, C.

(2025) Chem : 102740

• DOI: https://doi.org/10.1016/j.chempr.2025.102740

Biological Assembly 1  

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

Biological assembly 1 assigned by authors.

Biological Assembly Evidence: gel filtration

Biological Assembly 2  

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

Biological assembly 2 assigned by authors.

Macromolecule Content 

• Total Structure Weight: 74.72 kDa 
• Atom Count: 5,284 
• Modeled Residue Count: 612 
• Deposited Residue Count: 630 
• Unique protein chains: 1

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
Butirosin biosynthesis protein H N-terminal domain-containing protein	A, B	315	Ruminiclostridium cellulolyticum	Mutation(s): 0  Gene Names: Ccel_3254
UniProt
Find proteins for B8I0Y7 (Ruminiclostridium cellulolyticum (strain ATCC 35319 / DSM 5812 / JCM 6584 / H10)) Explore B8I0Y7  Go to UniProtKB:  B8I0Y7

Small Molecules

Ligands 2 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram
HBA (Subject of Investigation/LOI)	C [auth A], E [auth B]	P-HYDROXYBENZALDEHYDE C7 H6 O2 RGHHSNMVTDWUBI-UHFFFAOYSA-N
PO4	D [auth A]	PHOSPHATE ION O4 P NBIIXXVUZAFLBC-UHFFFAOYSA-K

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 1.60 Å
• R-Value Free:  0.216 (Depositor), 0.222 (DCC) 
• R-Value Work:  0.185 (Depositor), 0.191 (DCC) 
• R-Value Observed: 0.186 (Depositor) 

Space Group: P 1 2₁ 1

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 61.92	α = 90
b = 59.8	β = 95.75
c = 85.07	γ = 90

Software Package:

Software Name	Purpose
REFMAC	refinement
PDB_EXTRACT	data extraction
XDS	data reduction
XSCALE	data scaling
PHASER	phasing

Structure Validation

Entry History & Funding Information

Deposition Data

• Released Date: 2025-10-01 
Deposition Author(s): Gude, F., Bohne, A., Dell, M., Franke, J., Dunbar, K.L., Groll, M., Hertweck, C.

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

Revision History  

• Version 1.0: 2025-10-01
  Type: Initial release