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Related Experiment Videos

The primary structure of myohemerythrin.

G L Klippenstein, J L Cote, S E Ludlam

    Biochemistry
    |March 9, 1976
    PubMed
    Summary

    The amino acid sequence of muscle hemerythrin from Themiste pyroides was determined. This muscle protein (myohemerythrin) shows significant differences from coelomic hemerythrins, with limited homology.

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    Hemerythrin: alternative oxygen carrier.

    Science (New York, N.Y.)·1976

    Area of Science:

    • Biochemistry
    • Molecular Biology
    • Marine Biology

    Background:

    • Hemerythrins are non-heme iron oxygen-binding proteins found in marine invertebrates.
    • Muscle hemerythrin (myohemerythrin) has distinct functional roles compared to coelomic hemerythrins.

    Purpose of the Study:

    • To determine the complete amino acid sequence of myohemerythrin from Themiste pyroides.
    • To compare the primary structure of myohemerythrin with coelomic hemerythrins from related species.

    Main Methods:

    • Peptide analysis using tryptic, chymotryptic, and cyanogen bromide digestion.
    • Amino acid sequencing of resulting peptides.
    • Homology analysis using sequence alignment.

    Main Results:

    • The complete amino acid sequence of Themiste pyroides myohemerythrin was elucidated.
    • Myohemerythrin showed substantial primary structure differences compared to coelomic hemerythrins.
    • Homology was 46% with Phascolopsis gouldii coelomic hemerythrin and 45% with Themiste pyroides coelomic hemerythrin.
    • Regions of homology were concentrated near the termini and implicated in active center iron ligation.

    Conclusions:

    • Muscle and coelomic hemerythrins from sipunculids have diverged significantly in primary structure.
    • Structural differences suggest distinct evolutionary pathways and functional adaptations.
    • Conserved regions likely relate to essential functional residues, particularly iron-binding sites.

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