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Updated: May 23, 2025

Resurrection of Dormant Daphnia magna: Protocol and Applications

Resurrection of Dormant Daphnia magna: Protocol and Applications

Published on: January 19, 2018

Resuscitation-promoting factor (Rpf) terminates dormancy among diverse soil bacteria.

Jay T Lennon¹, Brent K Lehmkuhl¹, Lingling Chen²

¹Department of Biology, Indiana University, Bloomington, Indiana, USA.

|April 16, 2025

Summary

This summary is machine-generated.

Soil bacteria use resuscitation-promoting factor (Rpf) to wake up from dormancy. This study shows Rpf

Keywords:

biodiversity persistence seed bank signaling traits

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Area of Science:

Microbiology
Biochemistry
Ecology

Background:

Microorganisms enter dormancy to survive harsh conditions.
Resuscitation-promoting factor (Rpf) is an enzyme that helps bacteria exit dormancy.
Understanding Rpf's role in soil bacteria is crucial for ecosystem functioning.

Purpose of the Study:

To characterize Rpf from the soil bacterium *Micrococcus* KBS0714.
To investigate the effects of this Rpf on the resuscitation of diverse dormant soil bacteria.
To link Rpf's activity to bacterial functional traits and phylogeny.

Main Methods:

Protein purification and enzymatic assays of *Micrococcus* KBS0714 Rpf.
Site-directed mutagenesis and deletion analysis of Rpf.
Live-cell resuscitation assays with diverse soil bacteria exposed to recombinant Rpf.

Main Results:

*Micrococcus* KBS0714 Rpf exhibited high substrate affinity and required specific catalytic sites and structural motifs for activity.
Rpf-induced resuscitation varied among bacterial strains, correlating with phylogeny and cell envelope composition.
Rpf's effect was associated with functional traits like moisture niche and biofilm production.

Conclusions:

Rpf from *Micrococcus* KBS0714 is a key factor in soil bacterial dormancy and resuscitation.
Rpf activity is influenced by bacterial phylogeny and functional traits.
These findings have implications for microbial population dynamics and ecosystem processes in soils.