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Related Experiment Videos

Hemoglobin from a deep-sea hydrothermal-vent copepod.

S Hourdez1, J Lamontagne, P Peterson

  • 1Department of Biology, Pennsylvania State University, University Park, USA. hourdez@sb-roscoff.fr

The Biological Bulletin
|November 18, 2000
PubMed
Summary

This study reveals the structure and function of hemoglobin in the deep-sea copepod Benthoxynus spiculifer. Its high oxygen affinity aids survival in low-oxygen hydrothermal vent environments.

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Area of Science:

  • Marine Biology
  • Biochemistry
  • Deep-Sea Ecology

Background:

  • Deep-sea hydrothermal vents present extreme conditions: low oxygen, high carbon dioxide, and high sulfide concentrations.
  • Despite harsh conditions, copepods like Benthoxynus spiculifer thrive and are abundant at these vents.
  • Hemoglobin presence in some copepods is known, but its structure and function in vent species remain uncharacterized.

Purpose of the Study:

  • To investigate the structure and functional properties of hemoglobin from the deep-sea copepod Benthoxynus spiculifer.
  • To understand how this hemoglobin contributes to the survival of copepods in oxygen-depleted hydrothermal vent environments.

Main Methods:

  • Extraction of soluble proteins from Benthoxynus spiculifer.
  • Characterization of hemoglobin's molecular weight and subunit composition.

Related Experiment Videos

  • Analysis of oxygen-binding properties, including affinity, cooperativity, and Bohr effect, at varying temperatures.

    • Main Results:

    • Hemoglobin constitutes approximately 60% of B. spiculifer's soluble proteins.
    • The protein is a 208-kDa complex of 14 globin chains (seven 14.3 kDa and seven 15.2 kDa).
    • The hemoglobin exhibits high, temperature-sensitive oxygen affinity, lacking cooperativity and Bohr effect.

    Conclusions:

    • The identified hemoglobin functions primarily in oxygen acquisition for aerobic respiration in low-oxygen vent habitats.
    • Its properties are specifically adapted to the physiological demands of deep-sea hydrothermal vent environments.
    • This is the first detailed report on the structure and function of hemoglobin in a deep-sea vent copepod.