Experimental system for real-time assessment of potential changes in protein conformation induced by electromagnetic fields.

Bioelectromagnetics · 2013 · Unclear · Insufficient evidence

← Research stream

UnclearInsufficient evidencePaper 4612

Study snapshot

PublicationBioelectromagnetics · 2013

Study typeengineering

Reported directionUnclear

Evidence ratingInsufficient

Abstract

A novel experimental system to distinguish between potential thermal and non-thermal effects of electromagnetic fields (EMFs) on the conformational equilibrium and folding kinetics of proteins is presented. The system comprises an exposure chamber installed within the measurement compartment of a spectropolarimeter and allows real-time observation of the circular dichroism (CD) signal of the protein during EMF exposure. An optical temperature probe monitors the temperature of the protein solution at the site of irradiation. The electromagnetic, thermal, and fluid-dynamic behavior of the system is characterized by numerical and experimental means. The number of repeated EMF on/off cycles needed for achieving a certain detection limit is determined on the basis of the experimentally assessed precision of the CD measurements. The isolated thermosensor protein GrpE of the Hsp70 chaperone system of Eschericha coli serves as the test protein. Long-term experiments show high thermal reproducibility as well as thermal stability of the experimental setup.

Machine Enhanced Logic

AI evidence extraction

Structured fields below were generated from the paper’s abstract and metadata to make the evidence easier to inspect. Automated extraction may be incomplete or incorrect; verify important details against the original paper.

Study typeengineering

Effect directionunclear

PopulationNot supplied

Sample sizeNot supplied

Exposurelong-term experiments (duration not specified)

Evidence strengthInsufficientConfidence: 74% · Peer reviewed: yes

Main findings

The authors present an experimental system that enables real-time monitoring of a protein’s circular dichroism signal during EMF exposure while simultaneously measuring temperature at the irradiation site. Long-term experiments are reported to show high thermal reproducibility and thermal stability of the setup, and the system’s electromagnetic, thermal, and fluid-dynamic behavior is characterized numerically and experimentally.

Outcomes measured

Circular dichroism (CD) signal during EMF exposure
Protein conformational equilibrium
Protein folding kinetics
Temperature at site of irradiation
Thermal reproducibility/stability of setup
Electromagnetic/thermal/fluid-dynamic characterization of system
Detection limit via repeated EMF on/off cycles

Limitations

No EMF parameters (e.g., frequency, field strength, SAR) are provided in the abstract.
No quantitative results on EMF-induced changes in protein conformation/folding are reported in the abstract.
Sample size and number of EMF on/off cycles are not specified in the abstract.

View raw extracted JSON

{
  "study_type": "engineering",
  "exposure": {
    "band": null,
    "source": "exposure chamber (EMF irradiation) within spectropolarimeter",
    "frequency_mhz": null,
    "sar_wkg": null,
    "duration": "long-term experiments (duration not specified)"
  },
  "population": null,
  "sample_size": null,
  "outcomes": [
    "Circular dichroism (CD) signal during EMF exposure",
    "Protein conformational equilibrium",
    "Protein folding kinetics",
    "Temperature at site of irradiation",
    "Thermal reproducibility/stability of setup",
    "Electromagnetic/thermal/fluid-dynamic characterization of system",
    "Detection limit via repeated EMF on/off cycles"
  ],
  "main_findings": "The authors present an experimental system that enables real-time monitoring of a protein’s circular dichroism signal during EMF exposure while simultaneously measuring temperature at the irradiation site. Long-term experiments are reported to show high thermal reproducibility and thermal stability of the setup, and the system’s electromagnetic, thermal, and fluid-dynamic behavior is characterized numerically and experimentally.",
  "effect_direction": "unclear",
  "limitations": [
    "No EMF parameters (e.g., frequency, field strength, SAR) are provided in the abstract.",
    "No quantitative results on EMF-induced changes in protein conformation/folding are reported in the abstract.",
    "Sample size and number of EMF on/off cycles are not specified in the abstract."
  ],
  "evidence_strength": "insufficient",
  "confidence": 0.74,
  "peer_reviewed_likely": "yes",
  "keywords": [
    "electromagnetic fields",
    "protein conformation",
    "protein folding kinetics",
    "circular dichroism",
    "spectropolarimeter",
    "temperature monitoring",
    "thermal vs non-thermal effects",
    "GrpE",
    "Hsp70 chaperone system",
    "Escherichia coli"
  ],
  "suggested_hubs": []
}

AI can be wrong. Always verify against the paper.

AI-extracted fields are generated from the abstract and metadata and may be incomplete or incorrect. This material is for informational purposes and is not medical advice.

Identifiers and source

DOI: 10.1002/bem.21795
PubMed: 23640851

Read the original paper →

Related papers

← Back to the Research Library