Letter | Published:

D-Tyrosine Metabolism in Sorghum vulgare Seedlings

Naturevolume 207pages759760 (1965) | Download Citation

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Abstract

IT has previously been reported that sorghum seedlings incorporate carbon-14 from DL-tyrosine-2-14C into the nitrile carbon of p - hydroxymandelonitrile - β - glucose1. Furthermore, it was demonstrated that 14C from D-tyro-sine-2-14C was not incorporated into p -hydroxymandelonitrile-β-glucose1. It was also shown that a radioactive material which migrated differently from either the glucoside or tyrosine could be extracted from seedlings allowed to metabolize either DL-tyrosine-2-14C or DL-tyrosine-3-14C. Similar experiments with L-tyrosine-14C did not yield appreciable radioactive material in this portion of the chromatogram. These preliminary experiments suggested that D-tyrosine metabolism in Sorghum vulgare seedlings may not be affected through either a deamination or racemization as either process would lead to precursors of p-hydroxymandelonitrile-β-glucose1,2.

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References

  1. 1

    Gander, J. E., J. Biol. Chem., 237, 3229 (1962).

  2. 2

    Koukol, J., Miljanich, P., and Conn, E. E., J. Biol. Chem., 237, 3223 (1962).

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Author notes

    • LEONORE V. BALCE

    Present address: Biochemistry Department, U.P. College of Medicine, Herran, Manila, Philippines

    • J. E. GANDER

    Present address: Department of Biochemistry, University of Minnesota, St. Paul, 1, Minnesota

Affiliations

  1. Department of Agricultural Biochemistry, Ohio State University, Columbus, Ohio

    • LEONORE V. BALCE
    •  & J. E. GANDER

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https://doi.org/10.1038/207759a0

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