8JSZ image
Entry Detail
PDB ID:
8JSZ
Keywords:
Title:
Crystal structure of a uridylate cyclase from Anabaena sp.
Biological Source:
Source Organism:
PDB Version:
Deposition Date:
2023-06-20
Release Date:
2024-07-03
Method Details:
Experimental Method:
Resolution:
1.83 Å
R-Value Free:
0.17
R-Value Work:
0.17
R-Value Observed:
0.17
Space Group:
P 1
Macromolecular Entities
Polymer Type:polypeptide(L)
Description:uridylate cyclase
Chain IDs:A, B
Chain Length:280
Number of Molecules:2
Biological Source:Anabaena sp. CA
Primary Citation
Structural and functional characterization of cyclic pyrimidine-regulated anti-phage system.
Nat Commun 15 5634 5634 (2024)
PMID: 38965224 DOI: 10.1038/s41467-024-49861-2

Abstact

3',5'-cyclic uridine monophosphate (cUMP) and 3',5'-cyclic cytidine monophosphate (cCMP) have been established as bacterial second messengers in the phage defense system, named pyrimidine cyclase system for anti-phage resistance (Pycsar). This system consists of a pyrimidine cyclase and a cyclic pyrimidine receptor protein. However, the molecular mechanism underlying cyclic pyrimidine synthesis and recognition remains unclear. Herein, we determine the crystal structures of a uridylate cyclase and a cytidylate cyclase, revealing the conserved residues for cUMP and cCMP production, respectively. In addition, a distinct zinc-finger motif of the uridylate cyclase is identified to confer substantial resistance against phage infections. Furthermore, structural characterization of cUMP receptor protein PycTIR provides clear picture of specific cUMP recognition and identifies a conserved N-terminal extension that mediates PycTIR oligomerization and activation. Overall, our results contribute to the understanding of cyclic pyrimidine-mediated bacterial defense.

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