2XDB

A processed non-coding RNA regulates a bacterial antiviral system

Summary for 2XDB

• Entry DOI: 10.2210/pdb2xdb/pdb
• Related: 2XD0 2XDD
• Descriptor: TOXN, TOXI, SULFATE ION, ... (5 entities in total)
• Functional Keywords: toxin-rna complex, abortive infection, phage, toxin/rna
• Biological source: PECTOBACTERIUM ATROSEPTICUM; More
• Total number of polymer chains: 2
• Total formula weight: 33286.90

Authors

Blower, T.R.,Pei, X.Y.,Short, F.L.,Fineran, P.C.,Humphreys, D.P.,Luisi, B.F.,Salmond, G.P.C. (deposition date: 2010-04-30, release date: 2011-01-12, Last modification date: 2023-12-20)

Primary citation

Blower, T.R.,Pei, X.Y.,Short, F.L.,Fineran, P.C.,Humphreys, D.P.,Luisi, B.F.,Salmond, G.P.C.
A Processed Noncoding RNA Regulates an Altruistic Bacterial Antiviral System.
Nat.Struct.Mol.Biol., 18:185-, 2011

PubMed Abstract: The ≥ 10³⁰ bacteriophages on Earth relentlessly drive adaptive coevolution, forcing the generation of protective mechanisms in their bacterial hosts. One such bacterial phage-resistance system, ToxIN, consists of a protein toxin (ToxN) that is inhibited in vivo by a specific RNA antitoxin (ToxI); however, the mechanisms for this toxicity and inhibition have not been defined. Here we present the crystal structure of the ToxN-ToxI complex from Pectobacterium atrosepticum, determined to 2.75-Å resolution. ToxI is a 36-nucleotide noncoding RNA pseudoknot, and three ToxI monomers bind to three ToxN monomers to generate a trimeric ToxN-ToxI complex. Assembly of this complex is mediated entirely through extensive RNA-protein interactions. Furthermore, a 2'-3' cyclic phosphate at the 3' end of ToxI, and catalytic residues, identify ToxN as an endoRNase that processes ToxI from a repetitive precursor but is regulated by its own catalytic product.

PubMed: 21240270
DOI: 10.1038/NSMB.1981

Experimental method

X-RAY DIFFRACTION (2.55 Å)