9CRO | pdb_00009cro

Post-targeting aCascade Type IA CRISPR-Cas Surveillance Complexes

• PDB DOI: https://doi.org/10.2210/pdb9CRO/pdb
• EM Map EMD-45873: EMDB EMDataResource
• NAKB: 9CRO

• Classification: RNA BINDING PROTEIN/RNA
• Organism(s): Saccharolobus solfataricus P2, Saccharolobus solfataricus
• Expression System: Escherichia coli BL21(DE3)
• Mutation(s): No 


• Deposited: 2024-07-22 Released: 2025-08-13 
• Deposition Author(s): Findlay, J.L., Gentry, J.K., Lawrence, C.M.
• Funding Organization(s): National Science Foundation (NSF, United States), National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)

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Experimental Data Snapshot

• Method: ELECTRON MICROSCOPY
• Resolution: 3.50 Å
• Aggregation State: PARTICLE 
• Reconstruction Method: SINGLE PARTICLE 

Starting Model: in silico

Literature

Structures and Disassembly of Post-Targeting Type I-A CRISPR-Cas Surveillance Complexes

Findlay, J.L., Gentry, J.K., Lawrence, C.M.

To be published.

Biological Assembly 1  

Global Symmetry: Asymmetric - C1 
Global Stoichiometry: Hetero 14-mer - A7B6C1 

Local Symmetry: Helical - H  (Explore in 3D)
Local Stoichiometry: Homo 7-mer - A7 Local Symmetry: Helical - H  (Explore in 3D)
Local Stoichiometry: Homo 6-mer - B6 

Biological assembly 1 assigned by authors.

Biological Assembly Evidence: electron microscopy

Macromolecule Content 

• Total Structure Weight: 399.62 kDa 
• Atom Count: 25,278 
• Modeled Residue Count: 3,171 
• Deposited Residue Count: 3,486 
• Unique protein chains: 3
• Unique nucleic acid chains: 1

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
CRISPR type I-A cluster 2/Apern-associated protein Csa5-2	A [auth J], B [auth I], C [auth K], D [auth L], E [auth M], F [auth N]	156	Saccharolobus solfataricus P2	Mutation(s): 0  Gene Names: csa5, SSO1443
UniProt
Find proteins for Q97Y90 (Saccharolobus solfataricus (strain ATCC 35092 / DSM 1617 / JCM 11322 / P2)) Explore Q97Y90  Go to UniProtKB:  Q97Y90

Entity ID: 2
Molecule	Chains	Sequence Length	Organism	Details	Image
CRISPR-associated aCascade subunit Cas7/Csa2 2	G [auth B], H [auth C], I [auth D], J [auth A], M [auth E], N [auth F], O [auth G]	321	Saccharolobus solfataricus P2	Mutation(s): 0  Gene Names: csa2b, cas7b, SSO1442
UniProt
Find proteins for Q97Y91 (Saccharolobus solfataricus (strain ATCC 35092 / DSM 1617 / JCM 11322 / P2)) Explore Q97Y91  Go to UniProtKB:  Q97Y91

Entity ID: 3
Molecule	Chains	Sequence Length	Organism	Details	Image
CRISPR system aCascade subunit Cas5 1	K [auth H]	240	Saccharolobus solfataricus P2	Mutation(s): 0  Gene Names: cas5a, SSO1441
UniProt
Find proteins for Q97Y92 (Saccharolobus solfataricus (strain ATCC 35092 / DSM 1617 / JCM 11322 / P2)) Explore Q97Y92  Go to UniProtKB:  Q97Y92

Entity ID: 4
Molecule	Chains	Length	Organism	Image
RNA (44-MER)	L [auth S]	63	Saccharolobus solfataricus

Small Molecules

Ligands 1 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram
TRS	P [auth B], Q [auth C], R [auth D], S [auth A], T [auth S], U [auth S], V [auth E]	2-AMINO-2-HYDROXYMETHYL-PROPANE-1,3-DIOL C4 H12 N O3 LENZDBCJOHFCAS-UHFFFAOYSA-O

Experimental Data & Validation

Experimental Data

• Method: ELECTRON MICROSCOPY
• Resolution: 3.50 Å
• Aggregation State: PARTICLE 
• Reconstruction Method: SINGLE PARTICLE 

EM Software:

Task	Software Package	Version
RECONSTRUCTION	cryoSPARC
MODEL REFINEMENT	PHENIX

Structure Validation

Entry History & Funding Information

Deposition Data

• Released Date: 2025-08-13 
Deposition Author(s): Findlay, J.L., Gentry, J.K., Lawrence, C.M.

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Funding Organization	Location	Grant Number
National Science Foundation (NSF, United States)	United States	DBI-1828765
National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)	United States	P30GM140963

Revision History  

• Version 1.0: 2025-08-13
  Type: Initial release