ISDA

Deposition Date 2008-09-19

Release Date 2008-09-30

Last Version Date 2024-02-21

Entry Detail

PDB ID:

3EKE

Keywords:

HYDROLASE

Title:

Crystal structure of IBV X-domain at pH 5.6

Biological Source:

Source Organism:

Avian infectious bronchitis virus (strain Beaudette) (Taxon ID: 11122)

Host Organism:

Escherichia coli

Method Details:

Experimental Method:

X-RAY DIFFRACTION

Resolution:

2.10 Å

R-Value Free:

0.23

R-Value Work:

0.19

R-Value Observed:

0.20

Space Group:

P 32 2 1

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Macromolecular Entities

Protein Blast

Polymer Type:polypeptide(L)
Molecule:Non-structural protein 3
Gene (Uniprot):rep
Chain IDs:A
Chain Length:176
Number of Molecules:1
Biological Source:Avian infectious bronchitis virus (strain Beaudette)

UniProt ID:P0C6Y1 Pfam ID:PF01661 EC:3.4.22.B14

Ligand Molecules

TLA

Primary Citation

Crystal structures of the X-domains of a Group-1 and a Group-3 coronavirus reveal that ADP-ribose-binding may not be a conserved property.

Piotrowski, Y, Hansen, G, Boomaars-van der Zanden, A.L, Snijder, E.J, Gorbalenya, A.E, Hilgenfeld, R.Show

Protein Sci. 18 6 16 (2009)

PMID: 19177346 DOI: 10.1002/pro.15

Abstact

The polyproteins of coronaviruses are cleaved by viral proteases into at least 15 nonstructural proteins (Nsps). Consisting of five domains, Nsp3 is the largest of these (180-210 kDa). Among these domains, the so-called X-domain is believed to act as ADP-ribose-1''-phosphate phosphatase or to bind poly(ADP-ribose). However, here we show that the X-domain of Infectious Bronchitis Virus (strain Beaudette), a Group-3 coronavirus, fails to bind ADP-ribose. This is explained on the basis of the crystal structure of the protein, determined at two different pH values. For comparison, we also describe the crystal structure of the homologous X-domain from Human Coronavirus 229E, a Group-1 coronavirus, which does bind ADP-ribose.

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Primary Citation of related structures