8FV5

Representation of 16-mer phiPA3 PhuN Lattice, p2

This is a non-PDB format compatible entry.

Summary for 8FV5

• Entry DOI: 10.2210/pdb8fv5/pdb
• Related: 8FNE
• EMDB information: 29310 29451
• Descriptor: Maltose/maltodextrin-binding periplasmic protein, phiPA3 PhuN (1 entity in total)
• Functional Keywords: phipa3 protein, shell protein, phun, phage nucleus, viral protein
• Biological source: Escherichia coli (strain K12); More
• Total number of polymer chains: 32
• Total formula weight: 3524034.50

Authors

Nieweglowska, E.S.,Brilot, A.F.,Mendez-Moran, M.,Kokontis, C.,Baek, M.,Li, J.,Cheng, Y.,Baker, D.,Bondy-Denomy, J.,Agard, D.A. (deposition date: 2023-01-18, release date: 2023-03-01, Last modification date: 2024-05-01)

Primary citation

Nieweglowska, E.S.,Brilot, A.F.,Mendez-Moran, M.,Kokontis, C.,Baek, M.,Li, J.,Cheng, Y.,Baker, D.,Bondy-Denomy, J.,Agard, D.A.
The phi PA3 phage nucleus is enclosed by a self-assembling 2D crystalline lattice.
Nat Commun, 14:927-927, 2023

PubMed Abstract: To protect themselves from host attack, numerous jumbo bacteriophages establish a phage nucleus-a micron-scale, proteinaceous structure encompassing the replicating phage DNA. Bacteriophage and host proteins associated with replication and transcription are concentrated inside the phage nucleus while other phage and host proteins are excluded, including CRISPR-Cas and restriction endonuclease host defense systems. Here, we show that nucleus fragments isolated from ϕPA3 infected Pseudomonas aeruginosa form a 2-dimensional lattice, having p2 or p4 symmetry. We further demonstrate that recombinantly purified primary Phage Nuclear Enclosure (PhuN) protein spontaneously assembles into similar 2D sheets with p2 and p4 symmetry. We resolve the dominant p2 symmetric state to 3.9 Å by cryo-EM. Our structure reveals a two-domain core, organized into quasi-symmetric tetramers. Flexible loops and termini mediate adaptable inter-tetramer contacts that drive subunit assembly into a lattice and enable the adoption of different symmetric states. While the interfaces between subunits are mostly well packed, two are open, forming channels that likely have functional implications for the transport of proteins, mRNA, and small molecules.

PubMed: 36807264
DOI: 10.1038/s41467-023-36526-9

Experimental method

ELECTRON MICROSCOPY (4.21 Å)