[English] 日本語
Yorodumi Papers
- Database of articles cited by EMDB/PDB/SASBDB data -

+
Search query

Keywords
Structure methods
Author
Journal
IF

-
Structure paper

TitleStructural basis for retron co-option of anti-phage ATPase-nuclease.
Journal, issue, pagesNat Struct Mol Biol, Year 2025
Publish dateOct 31, 2025
AuthorsBing Wang / Renee D Hoffman / Ya-Ming Hou / Hong Li /
PubMed AbstractRetrons have been recently identified as bacterial defense systems that employ a tripartite of reverse transcriptase, non-coding RNA (ncRNA) and its derived multi-copy single stranded DNA (msDNA) to ...Retrons have been recently identified as bacterial defense systems that employ a tripartite of reverse transcriptase, non-coding RNA (ncRNA) and its derived multi-copy single stranded DNA (msDNA) to sequester effector activity. Phage invasion activates retrons, triggering effector activity and inducing abortive infection and cell growth arrest. Ec78 differs from other retrons by leveraging the Septu defense system, a stand-alone ATPase-nuclease pair (PtuAB), by reshaping the phage sensing and molecular assembly processes of PtuAB. To elucidate how Ec78 hijacks PtuAB, we determined electron cryomicroscopy structures of Ec78 as well as the retron-displaced PtuAB. We show that the Ec78-associated ATPase, PtuA, acquired unique elements that enable its interactions with the reverse transcriptase and the msDNA, and self-assembly when displaced by the retron. By biochemical and mutational analyses, we also show that the retron-displaced PtuAB forms a tetramer, unlike its stand-alone counterpart, that restricts the host. However, in the presence of the retron, the retron-displaced PtuAB confers a well-controlled immune response, eliciting ATP hydrolysis- and msDNA-regulated targeting to host factors. Our studies reveal an evolutionary principle for retrons to co-opt conserved enzyme modules for defense in response to different cellular needs.
External linksNat Struct Mol Biol / PubMed:41174277
MethodsEM (single particle)
Resolution2.69 - 3.15 Å
Structure data

49570

9nnb

EMDB-49570, PDB-9nnb:
Cryo-EM structure of the Retron Ec78 complex, PtuA:PtuB:RT (4:2:1)
Method: EM (single particle) / Resolution: 2.75 Å

49575

9nnh

EMDB-49575, PDB-9nnh:
Cryo-EM structure of the Retron Ec78 complex, PtuA:PtuB:RT (4:2:2)
Method: EM (single particle) / Resolution: 2.69 Å

49576

9nnk

EMDB-49576, PDB-9nnk:
Cryo-EM structure of Retron-displaced free PtuAB complex, PtuA:PtuB (4:2)
Method: EM (single particle) / Resolution: 3.15 Å

Chemicals

ChemComp-ADP:
ADENOSINE-5'-DIPHOSPHATE / ADP, energy-carrying molecule*YM

ChemComp-ZN:
Unknown entry

ChemComp-ATP:
ADENOSINE-5'-TRIPHOSPHATE / ATP, energy-carrying molecule*YM

Source
  • escherichia coli (E. coli)
KeywordsDNA-RNA HYBRID / Retron; msDNA; ncRNA / Retron; ncRNA; msDNA / TOXIN / Retron effector / ATPase / HNH nuclease

+
About Yorodumi Papers

-
News

-
Feb 9, 2022. New format data for meta-information of EMDB entries

New format data for meta-information of EMDB entries

  • Version 3 of the EMDB header file is now the official format.
  • The previous official version 1.9 will be removed from the archive.

Related info.:EMDB header

External links:wwPDB to switch to version 3 of the EMDB data model

-
Aug 12, 2020. Covid-19 info

Covid-19 info

URL: https://pdbj.org/emnavi/covid19.php

New page: Covid-19 featured information page in EM Navigator.

Related info.:Covid-19 info / Mar 5, 2020. Novel coronavirus structure data

+
Mar 5, 2020. Novel coronavirus structure data

Novel coronavirus structure data

Related info.:Yorodumi Speices / Aug 12, 2020. Covid-19 info

External links:COVID-19 featured content - PDBj / Molecule of the Month (242)：Coronavirus Proteases

+
Jan 31, 2019. EMDB accession codes are about to change! (news from PDBe EMDB page)

EMDB accession codes are about to change! (news from PDBe EMDB page)

  • The allocation of 4 digits for EMDB accession codes will soon come to an end. Whilst these codes will remain in use, new EMDB accession codes will include an additional digit and will expand incrementally as the available range of codes is exhausted. The current 4-digit format prefixed with “EMD-” (i.e. EMD-XXXX) will advance to a 5-digit format (i.e. EMD-XXXXX), and so on. It is currently estimated that the 4-digit codes will be depleted around Spring 2019, at which point the 5-digit format will come into force.
  • The EM Navigator/Yorodumi systems omit the EMD- prefix.

Related info.:Q: What is EMD? / ID/Accession-code notation in Yorodumi/EM Navigator

External links:EMDB Accession Codes are Changing Soon! / Contact to PDBj

+
Jul 12, 2017. Major update of PDB

Major update of PDB

  • wwPDB released updated PDB data conforming to the new PDBx/mmCIF dictionary.
  • This is a major update changing the version number from 4 to 5, and with Remediation, in which all the entries are updated.
  • In this update, many items about electron microscopy experimental information are reorganized (e.g. em_software).
  • Now, EM Navigator and Yorodumi are based on the updated data.

External links:wwPDB Remediation / Enriched Model Files Conforming to OneDep Data Standards Now Available in the PDB FTP Archive

-
Yorodumi Papers

Database of articles cited by EMDB/PDB/SASBDB data

  • Database of articles cited by EMDB, PDB, and SASBDB entries
  • Using PubMed data

Related info.:EMDB / PDB / SASBDB / Yorodumi / EMN Papers / Changes in new EM Navigator and Yorodumi

Read more