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    •   MOspace Home
    • University of Missouri-Columbia
    • Graduate School - MU Theses and Dissertations (MU)
    • Theses and Dissertations (MU)
    • Dissertations (MU)
    • 2006 Dissertations (MU)
    • 2006 MU dissertations - Freely available online
    • View Item
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    Sulfur metabolism in Glycine max [L.] Merr : characterization of serine acetyletransferase and O-acetylserine (thiol) lyase

    Chronis, Demosthenis, 1975-
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    Date
    2006
    Format
    Thesis
    Metadata
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    Abstract
    Soybean (Glycine max [L.] Merr) is considered an excellent protein source for both humans and livestock. Further improvement of quantity and quality of soybean protein is vital for maintaining the utility of this versatile plant derived nutrient. Although high protein soybean lines are currently available, the cysteine and methionine content is still not adequate to meet the dietary needs of livestock and poultry. Currently, rations for these animals are supplemented with synthetic methionine, a procedure costing the animal industry millions of dollars annually. Efforts to enhance the sulfur amino acid content of soybean protein through genetic engineering and traditional breeding have met with limited success. Expression of exogenous high methionine proteins in soybeans has not substantially increased the overall sulfur amino acid content. A possible explanation is that the availability of sulfur amino acids in developing seeds may be limiting. Effectively increasing the accumulation of sulfur amino acids in soybean will require metabolic engineering of the sulfur assimilatory pathway. In an attempt to improve the nutritional quality of soybean seed proteins, molecular techniques are being employed to manipulate key enzymes involved in sulfur assimilation. The molecular cloning and characterization of serine acetyltransferase (SAT) and O-acetylserine (thiol) lyase (OASTL, cysteine synthase), key enzymes in cysteine biosynthesis, is presented here.
    URI
    https://doi.org/10.32469/10355/4483
    https://hdl.handle.net/10355/4483
    Degree
    Ph. D.
    Thesis Department
    Plant sciences (MU)
    Rights
    OpenAccess.
    Collections
    • 2006 MU dissertations - Freely available online
    • Plant Sciences electronic theses and dissertations (MU)

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