25XO | pdb_000025xo

Cryo-EM structure of the Crimean-Congo hemorrhagic fever virus full-length L protein RdRP elongation complex (EC14b form)

• PDB DOI: https://doi.org/10.2210/pdb25XO/pdb
• EM Map EMD-80450: EMDB EMDataResource

• Classification: VIRAL PROTEIN/RNA
• Organism(s): Orthonairovirus haemorrhagiae, synthetic construct
• Expression System: Spodoptera frugiperda
• Mutation(s): No 


• Deposited: 2026-04-22 Released: 2026-08-05 
• Deposition Author(s): Jia, H., Tang, B., Gong, P.
• Funding Organization(s): Ministry of Science and Technology (MoST, China), National Natural Science Foundation of China (NSFC)

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Experimental Data Snapshot

• Method: ELECTRON MICROSCOPY
• Resolution: 3.18 Å
• Aggregation State: PARTICLE 
• Reconstruction Method: SINGLE PARTICLE 

Literature

RNA synthesis and substrate analog inhibition in the CCHFV polymerase

Jia, H., Tang, B., Liu, S., Wen, X., Wu, F., Hu, X., Zhou, H., Chong, T., Lv, L., Liu, Q., Rao, G., Wei, M., Jing, X., Cao, S., Deng, F., Hu, Z., Shu, B., Gong, R., Wu, J., Wang, M., Gong, P.

(2026) Nature 

• DOI: https://doi.org/10.1038/s41586-026-10913-w

Biological Assembly 1  

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

Biological assembly 1 assigned by authors.

Biological Assembly Evidence: electron microscopy

Macromolecule Content 

• Total Structure Weight: 489.28 kDa 
• Atom Count: 24,541 
• Modeled Residue Count: 3,328 
• Deposited Residue Count: 4,101 
• Unique protein chains: 1
• Unique nucleic acid chains: 4

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
RNA-directed RNA polymerase L	A	3,989	Orthonairovirus haemorrhagiae	Mutation(s): 0  EC: 2.7.7.48 (PDB Primary Data), 3.4.19.12 (PDB Primary Data)
UniProt
Find proteins for A0A068JD44 (Orthonairovirus haemorrhagiae) Explore A0A068JD44  Go to UniProtKB:  A0A068JD44

Entity ID: 2
Molecule	Chains	Length	Organism	Image
RNA (38-MER)	B, F	38	synthetic construct

Entity ID: 3
Molecule	Chains	Length	Organism	Image
RNA (5'-R(*GP*GP*AP*UP*AP*UP*AP*AP*UP*CP*AP*AP*AP*A)-3')	C	14	synthetic construct

Entity ID: 4
Molecule	Chains	Length	Organism	Image
RNA (5'-R(*UP*CP*UP*CP*AP*AP*AP*GP*AP*UP*AP*UP*CP*AP*AP*UP*CP*C)-3')	D	18	synthetic construct

Entity ID: 5
Molecule	Chains	Length	Organism	Image
RNA (5'-R(*GP*GP*GP*A)-3')	E	4	synthetic construct

Small Molecules

Ligands 2 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram
ZN (Subject of Investigation/LOI)	G [auth A], I [auth A], K [auth A]	ZINC ION Zn PTFCDOFLOPIGGS-UHFFFAOYSA-N
MN (Subject of Investigation/LOI)	H [auth A], J [auth A], L [auth A]	MANGANESE (II) ION Mn WAEMQWOKJMHJLA-UHFFFAOYSA-N

Experimental Data & Validation

Experimental Data

• Method: ELECTRON MICROSCOPY
• Resolution: 3.18 Å
• Aggregation State: PARTICLE 
• Reconstruction Method: SINGLE PARTICLE 

EM Software:

Task	Software Package	Version
MODEL REFINEMENT	PHENIX	1.20.1_4487
RECONSTRUCTION	cryoSPARC	v4.6.2

Structure Validation

Entry History 

& Funding Information

Deposition Data

• Released Date: 2026-08-05 
Deposition Author(s): Jia, H., Tang, B., Gong, P.

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Funding Organization	Location	Grant Number
Ministry of Science and Technology (MoST, China)	China	2022YFC2303300
National Natural Science Foundation of China (NSFC)	China	32300139

Revision History  

• Version 1.0: 2026-08-05
  Type: Initial release