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Related Experiment Videos

Astaxanthin binding protein in Atlantic salmon.

Sarah J Matthews1, Neil W Ross, Santosh P Lall

  • 1Department of Food Science and Technology, Dalhousie University, P.O. Box 1000, Halifax, Nova Scotia, Canada B3J 2X4.

Comparative Biochemistry and Physiology. Part B, Biochemistry & Molecular Biology
|April 29, 2006
PubMed
Summary

Researchers identified alpha-actinin as the key protein responsible for binding astaxanthin, the pigment that gives salmon its unique color. This finding explains differences in fish pigmentation, not due to binding capacity but pigment metabolism or transport.

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Molecular Mechanism Involved in Carotenoid Metabolism in Post-Smolt Atlantic Salmon: Astaxanthin Metabolism During Flesh Pigmentation and Its Antioxidant Properties.

Marine biotechnology (New York, N.Y.)·2021

Area of Science:

  • Biochemistry
  • Aquatic Animal Science
  • Food Science

Background:

  • Salmon and trout flesh coloration is due to dietary carotenoids like astaxanthin and canthaxanthin.
  • Understanding pigment-protein interactions is crucial for explaining variations in fish flesh color.

Purpose of the Study:

  • To identify the specific myofibrillar protein responsible for binding astaxanthin in salmon muscle.
  • To investigate the role of protein binding capacity in the pigmentation differences between salmon and white fish.

Main Methods:

  • Salmon muscle proteins were sequentially extracted under non-denaturing, low ionic strength conditions.
  • In vitro binding assays, SDS-PAGE, and quantitative densitometry were used to analyze protein fractions.
  • Alpha-actinin was identified and its astaxanthin binding capacity confirmed using purified protein and mass spectrometry.

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Main Results:

  • Alpha-actinin was the only myofibrillar protein significantly correlated with astaxanthin binding (P<0.05).
  • Purified salmon alpha-actinin exhibited a molar binding ratio of 1.11:1.00 for astaxanthin.
  • Halibut alpha-actinin showed a similar binding ratio (0.893:1), suggesting conserved binding capacity.

Conclusions:

  • Alpha-actinin is the primary protein responsible for astaxanthin binding in salmon muscle.
  • Differences in pigmentation between salmon and white fish are likely due to variations in pigment metabolism or transport, not muscle binding capacity.