Metabolism of l-Tyrosine to 4-Hydroxybenzaldehyde and 3-Bromo-4-Hydroxybenzaldehyde by Chloroplast-containing Fractions of Odonthalia floccosa (Esp.) Falk 1
AUTOR(ES)
Manley, Steven L.
RESUMO
The biosynthesis of 4-hydroxybenzaldehyde and 3-bromo-4-hydroxybenzaldehyde from l-[U-14C]tyrosine has been demonstrated in chloroplast-containing fractions obtained by differential and isopycnic centrifugation from the marine red alga Odonthalia floccosa. Surfactant and high speed centrifugation studies indicate that the biosynthetic pathway involves a particulate enzyme system, possibly located on the thylakoid membranes. The following scheme, based upon identification of labeled 14C-intermediates, is proposed for the formation of aldehydes: l-tyrosine → 4-hydroxyphenylpyruvic acid → 4-hydroxyphenylacetic acid → 4-hydroxymandelic acid → 4-hydroxybenzaldehyde → 3-bromo-4-hydroxybenzaldehyde.
ACESSO AO ARTIGO
http://www.pubmedcentral.nih.gov/articlerender.fcgi?artid=543186Documentos Relacionados
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