9ARW | pdb_00009arw

Structure of the guideless DtCmr Type III CRISPR complex

• PDB DOI: https://doi.org/10.2210/pdb9ARW/pdb
• EM Map EMD-43796: EMDB EMDataResource

• Classification: IMMUNE SYSTEM
• Organism(s): Dissulfurispira thermophila
• Expression System: Escherichia coli BL21
• Mutation(s): No 


• Deposited: 2024-02-23 Released: 2025-08-27 
• Deposition Author(s): Burman, N., Henriques, W.H., Pandey, S., Wiedenheft, B.
• Funding Organization(s): National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)

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Experimental Data Snapshot

• Method: ELECTRON MICROSCOPY
• Resolution: 3.80 Å
• Aggregation State: PARTICLE 
• Reconstruction Method: SINGLE PARTICLE 

Starting Model: in silico

Literature

Structure of a type III CRISPR complex that AMPylates a HEPN toxin

Pandey, S., Burman, N., Henriques, W.H., Zahl, T., Wiegand, T., Nyquist, H., Wilkinson, R., Wiedenheft, B.

To be published.

Biological Assembly 1  

Global Symmetry: Asymmetric - C1 
Global Stoichiometry: Hetero 8-mer - A3B2C1D1E1 Local Symmetry: Helical - H  (Explore in 3D)
Local Stoichiometry: Homo 3-mer - A3 

Local Symmetry: Helical - H  (Explore in 3D)
Local Stoichiometry: Homo 3-mer - A3 

Biological assembly 1 assigned by authors.

Biological Assembly Evidence: electron microscopy

Macromolecule Content 

• Total Structure Weight: 289.76 kDa 
• Atom Count: 14,171 
• Modeled Residue Count: 2,130 
• Deposited Residue Count: 2,573 
• Unique protein chains: 5

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
CSD domain-containing protein Cmr6	A [auth H]	376	Dissulfurispira thermophila	Mutation(s): 0  Gene Names: JZK55_14930
UniProt
Find proteins for A0A7G1H339 (Dissulfurispira thermophila) Explore A0A7G1H339  Go to UniProtKB:  A0A7G1H339

Entity ID: 2
Molecule	Chains	Sequence Length	Organism	Details	Image
Type III-B CRISPR-associated protein Cas10/Cmr2	B [auth A]	612	Dissulfurispira thermophila	Mutation(s): 0  Gene Names: JZK55_14980
UniProt
Find proteins for A0A7G1H3Q2 (Dissulfurispira thermophila) Explore A0A7G1H3Q2  Go to UniProtKB:  A0A7G1H3Q2

Entity ID: 3
Molecule	Chains	Sequence Length	Organism	Details	Image
Type III-B CRISPR module RAMP protein Cmr4	C, D, E	315	Dissulfurispira thermophila	Mutation(s): 0  Gene Names: JZK55_14950
UniProt
Find proteins for A0A7G1H376 (Dissulfurispira thermophila) Explore A0A7G1H376  Go to UniProtKB:  A0A7G1H376

Entity ID: 4
Molecule	Chains	Sequence Length	Organism	Details	Image
CRISPR type III-B/RAMP module-associated protein Cmr5	F, G	140	Dissulfurispira thermophila	Mutation(s): 0  Gene Names: JZK55_14940
UniProt
Find proteins for A0A7G1H353 (Dissulfurispira thermophila) Explore A0A7G1H353  Go to UniProtKB:  A0A7G1H353

Entity ID: 5
Molecule	Chains	Sequence Length	Organism	Details	Image
Type III-B CRISPR module-associated protein Cmr3	H [auth B]	360	Dissulfurispira thermophila	Mutation(s): 0  Gene Names: JZK55_14970
UniProt
Find proteins for A0A7G1H1A4 (Dissulfurispira thermophila) Explore A0A7G1H1A4  Go to UniProtKB:  A0A7G1H1A4

Small Molecules

Ligands 1 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram
ZN (Subject of Investigation/LOI)	I [auth A]	ZINC ION Zn PTFCDOFLOPIGGS-UHFFFAOYSA-N

Experimental Data & Validation

Experimental Data

• Method: ELECTRON MICROSCOPY
• Resolution: 3.80 Å
• Aggregation State: PARTICLE 
• Reconstruction Method: SINGLE PARTICLE 

EM Software:

Task	Software Package	Version
MODEL REFINEMENT	PHENIX	1.20.1_4487:
RECONSTRUCTION	cryoSPARC	4.1.2

Structure Validation

Entry History & Funding Information

Deposition Data

• Released Date: 2025-08-27 
Deposition Author(s): Burman, N., Henriques, W.H., Pandey, S., Wiedenheft, B.

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Funding Organization	Location	Grant Number
National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)	United States	R35GM134867-01

Revision History  

• Version 1.0: 2025-08-27
  Type: Initial release