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-Structure paper
タイトル | Cat1 forms filament networks to degrade NAD during the type III CRISPR-Cas antiviral response. |
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ジャーナル・号・ページ | Science, Vol. 388, Issue 6752, Page eadv9045, Year 2025 |
掲載日 | 2025年6月12日 |
![]() | Christian F Baca / Puja Majumder / James H Hickling / Dinshaw J Patel / Luciano A Marraffini / ![]() |
PubMed 要旨 | Type III CRISPR-Cas systems defend against viral infection in prokaryotes by using an RNA-guided complex that recognizes foreign transcripts and synthesizes cyclic oligoadenylate (cOA) messengers to ...Type III CRISPR-Cas systems defend against viral infection in prokaryotes by using an RNA-guided complex that recognizes foreign transcripts and synthesizes cyclic oligoadenylate (cOA) messengers to activate CRISPR-associated Rossmann-fold (CARF) immune effectors. In this study, we investigated a protein containing a CARF domain-fused Toll/interleukin-1 receptor (TIR) domain, Cat1. We found that Cat1 provides immunity by cleaving and depleting oxidized nicotinamide adenine dinucleotide (NAD) molecules from the infected host, inducing a growth arrest that prevents viral propagation. Cat1 forms dimers that stack upon each other to generate long filaments that are maintained by bound cOA ligands, with stacked TIR domains forming the NAD cleavage catalytic sites. Furthermore, Cat1 filaments assemble into distinct trigonal and pentagonal networks that enhance NAD degradation. Cat1 presents an unprecedented chemistry and higher-order protein assembly for the CRISPR-Cas response. |
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手法 | EM (単粒子) |
解像度 | 3.0 - 4.0 Å |
構造データ | EMDB-48629, PDB-9mud: EMDB-48630, PDB-9mue: EMDB-48639, PDB-9muo: EMDB-48698, PDB-9mw9: |
化合物 | ![]() ChemComp-AR6: ![]() ChemComp-DQV: |
由来 |
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![]() | ANTIVIRAL PROTEIN / CRISPR / antiphage defense / adaptive immunity / Filament / CARF / TIR / cA4 / NAD / ADPR / NAM / BAD |