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Factors in the evolution of hemoglobin function

A Riggs

    Federation Proceedings
    |August 1, 1976
    PubMed
    Summary
    This summary is machine-generated.

    Vertebrate hemoglobins evolve with cellular constraints, adapting oxygen transport for diverse needs like fish swim bladders and elasmobranch urea resistance. These adaptations showcase evolutionary strategies for efficient oxygen delivery.

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    Area of Science:

    • Biochemistry
    • Evolutionary Biology
    • Physiology

    Background:

    • Vertebrate blood hemoglobins are packaged within cells, presenting unique evolutionary constraints.
    • Hemoglobin concentration near solubility limits favors specific protein surface topologies.
    • Cellular ion distribution and membrane properties influence hemoglobin's oxygen transport function.

    Purpose of the Study:

    • To explore the evolutionary adaptations of vertebrate hemoglobins.
    • To understand how cellular packaging and environmental factors shape hemoglobin function.
    • To investigate specialized hemoglobin properties in different vertebrate groups.

    Main Methods:

    • Comparative analysis of hemoglobin structures and functions across vertebrate species.
    • Examination of physiological conditions affecting oxygen binding and release.

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  • Review of evolutionary strategies in hemoglobin adaptation.

    • Main Results:

    • Hemoglobin evolution is influenced by cellular packaging, favoring specific surface amino acid arrangements.
    • Changes in protein charge impact ion distribution and oxygen transport.
    • Specialized adaptations include oxygen release for swim bladder inflation in teleost fish and urea resistance in elasmobranchs.
    • Functional diversity is achieved through multiple hemoglobins within cells or distinct red blood cell populations during development.

    Conclusions:

    • Hemoglobin evolution is shaped by a balance between oxygen transport efficiency and cellular/environmental constraints.
    • Diverse vertebrate lineages exhibit unique hemoglobin adaptations tailored to specific physiological and ecological niches.
    • Hemoglobin's functional repertoire extends beyond simple oxygen delivery to metabolizing tissues.