What the study found
The study found that ComEC has a structural role in natural transformation, the bacterial process of taking up external DNA and integrating it into the genome. The reported structures show ComEC cleaving one strand of double-stranded DNA and guiding the remaining strand into the membrane.
Why the authors say this matters
The authors conclude that these findings provide a structural basis for ComEC's long-hypothesized roles in DNA processing and DNA translocation across the inner membrane during natural transformation.
What the researchers tested
The researchers used cryo-electron microscopy to determine structures of ComEC in DNA-free, single-stranded DNA-bound, and double-stranded DNA-bound forms. They also carried out biochemical analyses.
What worked and what didn't
The structures revealed ComEC in multiple states and showed a positively charged pore in the membrane domain. They also indicated that ComEC cleaves one strand of double-stranded DNA at its extracellular domain and routes the remaining strand inward.
What to keep in mind
The abstract does not describe specific limitations, and the summary provided here is limited to the reported structures and biochemical analyses.
Key points
- ComEC is described as a membrane protein responsible for DNA translocation in natural transformation.
- Cryo-electron microscopy structures were reported for DNA-free, single-stranded DNA-bound, and double-stranded DNA-bound ComEC.
- The structures suggest ComEC cleaves one strand of double-stranded DNA at an extracellular domain.
- The remaining DNA strand is guided into a positively charged pore in the membrane domain.
- The authors say the findings provide a structural basis for ComEC's role in DNA processing and translocation.
Disclosure
- Research title:
- ComEC structures show DNA cleavage and membrane translocation
- Authors:
- Hisato Hirano, Naoko Tsuji, Shinobu Chiba, Osamu Nureki
- Institutions:
- Kyoto Sangyo University, Kyoto Sangyo University, The University of Tokyo, The University of Tokyo
- Publication date:
- 2026-04-16
- OpenAlex record:
- View
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