7CHR

AcrIF9

• PDB DOI: https://doi.org/10.2210/pdb7CHR/pdb

• Classification: RNA BINDING PROTEIN
• Organism(s): Photobacterium damselae
• Expression System: Escherichia coli
• Mutation(s): No 


• Deposited: 2020-07-06 Released: 2020-12-23 
• Deposition Author(s): Kim, G.E., Park, H.H.
• Funding Organization(s): National Research Foundation (NRF, Korea)

---

Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 1.21 Å
• R-Value Free: 0.195 
• R-Value Work: 0.188 
• R-Value Observed: 0.189 

Literature

A high-resolution (1.2 angstrom ) crystal structure of the anti-CRISPR protein AcrIF9.

Kim, G.E., Lee, S.Y., Park, H.H.

(2020) FEBS Open Bio 10: 2532-2540

• PubMed: 32990416 
• DOI: https://doi.org/10.1002/2211-5463.12986
• Primary Citation of Related Structures:  
  7CHR


• PubMed Abstract: 
  

  Prokaryotic adaptive immunity by CRISPR-Cas systems, which confer resistance to foreign genetic elements, has been used by bacteria to combat viruses. To cope, viruses evolved multiple anti-CRISPR proteins, which can inhibit system function through various mechanisms. Although the structures and mechanisms of several anti-CRISPR proteins have been elucidated, those of the AcrIF9 family have not yet been identified. To understand the molecular basis underlying AcrIF9 anti-CRISPR function, we determined the 1.2 Å crystal structure of AcrIF9. Structural and biochemical studies showed that AcrIF9 exists in monomeric form in solution and can directly interact with DNA using a positively charged cleft. Based on analysis of the structure, we suggest part of the anti-CRISPR molecular mechanism by AcrIF9.

---

Organizational Affiliation: 

Department of Global Innovative Drugs, Graduate School of Chung-Ang University, Seoul, Korea.

Biological Assembly 1  

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

Biological assembly 1 assigned by authors.

Biological Assembly Evidence: light scattering

Macromolecule Content

• Total Structure Weight: 8.89 kDa 
• Atom Count: 763 
• Modelled Residue Count: 76 
• Deposited Residue Count: 76 
• Unique protein chains: 1

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
anti-CRISPR AcrIF9	A	76	Photobacterium damselae	Mutation(s): 0  Gene Names: BST98_20680
UniProt
Find proteins for A0A2S2CJ39 (Photobacterium damselae) Explore A0A2S2CJ39  Go to UniProtKB:  A0A2S2CJ39

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 1.21 Å
• R-Value Free: 0.195 
• R-Value Work: 0.188 
• R-Value Observed: 0.189 
• Space Group: P 2₁ 2₁ 2₁

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 27.23	α = 90
b = 31.35	β = 90
c = 80.7	γ = 90

Software Package:

Software Name	Purpose
PHENIX	refinement
MxDC	data collection
XDS	data scaling
PHASER	phasing
Coot	model building

Structure Validation

Entry History & Funding Information

Deposition Data

• Released Date: 2020-12-23 
Deposition Author(s): Kim, G.E., Park, H.H.

---

Funding Organization	Location	Grant Number
National Research Foundation (NRF, Korea)	Korea, Republic Of	--

Revision History  

• Version 1.0: 2020-12-23
  Type: Initial release
  
• Version 1.1: 2024-03-27
  Changes: Data collection, Database references, Derived calculations