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Computer evaluation of VirE2 protein complexes for ssDNA transfer ability.

Irina Volokhina1, Yury Gusev1, Svyatoslav Mazilov1

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Summary

Agrobacterium VirE2 proteins may form membrane pores to deliver DNA into plant cells. Computer simulations suggest a two-subunit complex might gate, but four-subunit complexes showed no pore changes.

Keywords:
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Area of Science:

  • Molecular Biology
  • Biophysics
  • Computational Biology

Background:

  • Agrobacterium tumefaciens transfers single-stranded DNA (ssDNA) from its Ti plasmid into plant chromosomes.
  • The mechanism of ssDNA transport across plant cell membranes is not fully understood.
  • VirE2 proteins are hypothesized to form membrane pores for ssDNA-VirD2-VirE2 complex translocation.

Purpose of the Study:

  • To computationally simulate the pore-forming capacity of VirE2 proteins.
  • To evaluate the conformational dynamics of VirE2 complexes.

Main Methods:

  • Molecular dynamics simulations.
  • Normal modes analysis.
  • Simulation of two- and four-subunit VirE2 complexes.

Main Results:

  • No significant domain reorientation was observed in two- and four-subunit VirE2 complexes within 1 ns simulations.
  • A potential ion channel-like gating mechanism was proposed for the two-subunit VirE2 complex.
  • No conformational changes were predicted within the pore of the four-subunit VirE2 complex.

Conclusions:

  • The study provides insights into the potential pore-forming ability of VirE2 proteins.
  • A two-subunit VirE2 complex may exhibit gating behavior, facilitating DNA transfer.
  • Further research is needed to elucidate the precise role of VirE2 in DNA translocation.