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Dynamic Phosphoproteomic Profiling Captured Early Signaling Events for Cold Acclimation in Larval Zebrafish.

Junjun Yan1,2, Yong Long1, Jing Ren3

  • 1Institute of Hydrobiology, Chinese Academy of Sciences Hubei, Wuhan, P.R. China.

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Summary

Cold acclimation enhances cold tolerance, but its signaling pathways are unclear. This study reveals early phosphorylation events in zebrafish larvae, identifying key kinases and proteins involved in cold signal transduction.

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Area of Science:

  • * Molecular Biology
  • * Proteomics
  • * Zebrafish Model Organism

Background:

  • * Mild low-temperature acclimation improves cold tolerance and protects against stress-induced injury in many species.
  • * The precise molecular mechanisms initiating cold acclimation signal transduction remain largely unknown.
  • * Understanding these early events is crucial for comprehending stress responses.

Purpose of the Study:

  • * To decipher the early signaling events triggered by immediate temperature drops in larval zebrafish.
  • * To identify key proteins and pathways involved in cold acclimation signal transduction.
  • * To provide a comprehensive phosphoproteome resource for stress response research.

Main Methods:

  • * Quantitative phosphoproteomics using tandem mass tagging (TMT) on larval zebrafish exposed to cold.
  • * Optimized sampling protocol involving trichloroacetic acid (TCA) for early signaling capture.
  • * Bioinformatic analyses including Gene Ontology (GO) and Kyoto Encyclopedia of Genes and Genomes (KEGG) pathway analysis.

Main Results:

  • * Identification and quantification of over 12,916 phosphosites on 4931 proteins, with 1490 differentially regulated by cold exposure.
  • * Upregulated phosphosites implicate transmembrane proteins, MAPK, transcription factors, and specific signaling pathways in cold acclimation.
  • * Key kinases (Ca2+/calmodulin-dependent protein kinase-II, PKC, PKA) and AHNAK-mediated pathways were identified as crucial for cold signaling.

Conclusions:

  • * Early phosphorylation events are critical for initiating cold acclimation signal transduction in zebrafish larvae.
  • * Identified kinases and scaffolding proteins like AHNAK play significant roles in cold signal perception and transduction.
  • * This study provides a foundational understanding and valuable phosphoproteome data for cold stress response research.