Structural highlights
Function
[A0A7G3WWQ5_9CAUD] Forms the portal vertex of the capsid. This portal plays critical roles in head assembly, genome packaging, neck/tail attachment, and genome ejection. The portal protein multimerizes as a single ring-shaped homododecamer arranged around a central channel.[ARBA:ARBA00003421][HAMAP-Rule:MF_04120]
Publication Abstract from PubMed
Many organisms have evolved specialized immune pattern-recognition receptors, including nucleotide-binding oligomerization domain-like receptors (NLRs) of the STAND superfamily that are ubiquitous in plants, animals, and fungi. Although the roles of NLRs in eukaryotic immunity are well established, it is unknown whether prokaryotes use similar defense mechanisms. Here, we show that antiviral STAND (Avs) homologs in bacteria and archaea detect hallmark viral proteins, triggering Avs tetramerization and the activation of diverse N-terminal effector domains, including DNA endonucleases, to abrogate infection. Cryo-electron microscopy reveals that Avs sensor domains recognize conserved folds, active-site residues, and enzyme ligands, allowing a single Avs receptor to detect a wide variety of viruses. These findings extend the paradigm of pattern recognition of pathogen-specific proteins across all three domains of life.
Prokaryotic innate immunity through pattern recognition of conserved viral proteins.,Gao LA, Wilkinson ME, Strecker J, Makarova KS, Macrae RK, Koonin EV, Zhang F Science. 2022 Aug 12;377(6607):eabm4096. doi: 10.1126/science.abm4096. Epub 2022 , Aug 12. PMID:35951700[1]
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.
References
- ↑ Gao LA, Wilkinson ME, Strecker J, Makarova KS, Macrae RK, Koonin EV, Zhang F. Prokaryotic innate immunity through pattern recognition of conserved viral proteins. Science. 2022 Aug 12;377(6607):eabm4096. doi: 10.1126/science.abm4096. Epub 2022 , Aug 12. PMID:35951700 doi:http://dx.doi.org/10.1126/science.abm4096
