Abstract:
:The metabolism of d- and l-methionine by immature cotyledons of soybean (Glycine max, L. cv Elf) grown in culture has been investigated using solid-state (13)C and (15)N nuclear magnetic resonance. d-Methionine is taken up by the cotyledons and converted to an amide, most likely by N-malonylation. About 16% of the l-methionine taken up is incorporated intact into protein, and 25% remains as soluble methionine. Almost two-thirds of the l-methionine that enters the cotyledons is degraded. The largest percentage of this is used in transmethylation of the carboxyl groups of pectin. Methionine is not extensively converted to polyamines. We attribute the stimulation of growth of the cotyledons by exogenous methionine to the bypassing of a rate-limiting methyl-transfer step in the synthesis of methionine itself, and subsequently of pectins and proteins.
journal_name
Plant Physioljournal_title
Plant physiologyauthors
Coker GT,Garbow JR,Schaefer Jdoi
10.1104/pp.83.3.698subject
Has Abstractpub_date
1987-03-01 00:00:00pages
698-702issue
3eissn
0032-0889issn
1532-2548journal_volume
83pub_type
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