2BTL image
Entry Detail
PDB ID:
2BTL
Title:
Crystal structure of the N-terminal domain of IBV coronavirus nucleocapsid
Biological Source:
Host Organism:
PDB Version:
Deposition Date:
2005-06-03
Release Date:
2005-12-14
Method Details:
Experimental Method:
Resolution:
1.95 Å
R-Value Free:
0.27
R-Value Work:
0.22
R-Value Observed:
0.23
Space Group:
P 1
Macromolecular Entities
Polymer Type:polypeptide(L)
Description:INFECTIOUS BRONCHITIS VIRUS NUCLEOCAPSID PROTEIN
Mutations:YES
Chain IDs:A, B
Chain Length:134
Number of Molecules:2
Biological Source:AVIAN INFECTIOUS BRONCHITIS VIRUS
Primary Citation
The Nucleocapsid Protein of Coronavirus Infectious Bronchitis Virus: Crystal Structure of its N-Terminal Domain and Multimerization Properties.
Structure 13 1859 ? (2005)
PMID: 16338414 DOI: 10.1016/J.STR.2005.08.021

Abstact

The coronavirus nucleocapsid (N) protein packages viral genomic RNA into a ribonucleoprotein complex. Interactions between N proteins and RNA are thus crucial for the assembly of infectious virus particles. The 45 kDa recombinant nucleocapsid N protein of coronavirus infectious bronchitis virus (IBV) is highly sensitive to proteolysis. We obtained a stable fragment of 14.7 kDa spanning its N-terminal residues 29-160 (IBV-N29-160). Like the N-terminal RNA binding domain (SARS-N45-181) of the severe acute respiratory syndrome virus (SARS-CoV) N protein, the crystal structure of the IBV-N29-160 fragment at 1.85 A resolution reveals a protein core composed of a five-stranded antiparallel beta sheet with a positively charged beta hairpin extension and a hydrophobic platform that are probably involved in RNA binding. Crosslinking studies demonstrate the formation of dimers, tetramers, and higher multimers of IBV-N. A model for coronavirus shell formation is proposed in which dimerization of the C-terminal domain of IBV-N leads to oligomerization of the IBV-nucleocapsid protein and viral RNA condensation.

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