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| N Use By Plants |
| Nitrate Assimilation |
| Ammonia Assimilation |
| Glu, Gln, Asn, Gly, Ser |
| Aminotransferases |
| Asp, Ala, GABA |
| Val, Leu, Ileu, Thr, Lys |
| Pro, Arg, Orn |
| Polyamines |
| Non-protein AAs |
| Alkaloids |
| Sulfate Assimilation |
| Cys, Met, AdoMet, ACC |
| His, Phe, Tyr, Tryp |
| Secondary Products |
| Onium Compounds |
| Enzymes |
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HORT640 - Metabolic Plant Physiology
Sulfate uptake and assimilation
S-Methylcysteine
An alternative pathway of synthesis of S-methylcysteine involves reaction of O-acetylserine with methane thiol (Giovanelli et al, 1980):
OAS + CH3SH ---> S-methylcysteine + acetate
This reaction is analogous to that catalyzed by cysteine synthase:
OAS + H2S ---> cysteine + acetate
References
Giovanelli J, Mudd SH, Datko AH 1980 Sulfur amino acids in plants. In (BJ Miflin ed) "The Biochemistry of Plants", Vol 5, Academic Press, New York, pp. 453-505.
Stewart GR, Larher F 1980 Accumulation of amino acids and related compounds in relation to environmental stress. In (BJ Miflin ed) "The Biochemistry of Plants", Vol 5, Academic Press, New York, pp. 609 - 635.
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David Rhodes
Department of Horticulture & Landscape Architecture
Horticulture Building
625 Agriculture Mall Drive
Purdue University
West Lafayette, IN 47907-2010
Last Update: 10/01/09
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