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DivIVA Phosphorylation Affects Its Dynamics and Cell Cycle in Radioresistant Deinococcus radiodurans.

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The kinase RqkA phosphorylates DivIVA at threonine 19 in Deinococcus radiodurans, impacting its function and potentially causing cell cycle arrest after radiation exposure.

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Area of Science:

  • Microbiology
  • Cell Biology
  • Biochemistry

Background:

  • Deinococcus radiodurans exhibits extreme resistance to DNA-damaging agents like radiation.
  • Cell division regulation in D. radiodurans under DNA damage is not fully understood.
  • DivIVA is a key protein regulating cell division and polarity in bacteria.

Purpose of the Study:

  • To investigate the role of RqkA, a radiation-responsive kinase, in DivIVA regulation in D. radiodurans.
  • To determine the functional consequences of DivIVA phosphorylation by RqkA.
  • To elucidate mechanisms of cell cycle arrest in D. radiodurans following radiation.

Main Methods:

  • Site-directed mutagenesis to create phospho-mimetic (T19E) and phospho-ablative (T19A) DivIVA mutants.
  • Expression of DivIVA-RFP fusion proteins to study protein dynamics and interactions.
  • Allelic replacement assays to assess the essentiality and function of modified DivIVA alleles.

Main Results:

  • RqkA phosphorylates drDivIVA at threonine 19 (T19).
  • The DivIVAT19E mutant showed altered dynamics, lost interaction with ParA2, and affected cell division.
  • Phosphorylation of drDivIVA by RqkA attenuates its function and may contribute to radiation-induced cell cycle arrest.

Conclusions:

  • RqkA-mediated phosphorylation of drDivIVA at T19 is crucial for its function in D. radiodurans.
  • This phosphorylation event affects DivIVA's interaction with genome segregation proteins and its cellular dynamics.
  • The findings provide insights into the DNA damage response and cell cycle regulation mechanisms in radioresistant bacteria.