New Amino Acids of Plants

2-Formylpyrrole natural products: origin, structural diversity, bioactivity and synthesis

“…15,53 Originally assigned as (2R,4R)-4 by X-ray crystal structure, the structure of hemerocallisamine I was later revised to the enantiomer (2S,4S)-4 by total synthesis, 54 suggesting hemerocallisamine I (4) arises from L-g-hydroxyglutamine metabolites in Hemerocallis. A variety of L-glutamine-based metabolites have been isolated from Hemerocallis, 55,56 some of which inhibit ab42 aggregation and accelerate neurite outgrowth in PC12 cells, signifying their potential as novel therapies for Alzheimer's disease. 53 Hemerocallisamine I (4), however, was shown to lack any such neurological activity.…”

α-(Methylenecyclopropyl)glycine from Litchi seeds

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Two cyclopropyl derivatives are among a large group of newly characterized amino acids isolated from higher plants (reviews: Hunt, 1959;Fowden, 1958Fowden, , 1960. These two compounds were identified as 1-aminocyclopropane-l-carboxylic acid, isolated from perry pears by Burroughs (1957) and from cowberries (Vaccinium viti8-idaea) by Vahatalo & Virtanen (1957), and ,-(methylenecyclopropyl)alanine (I, hypoglycin A), isolated from the fruits of the tropical plant Blighia 8apida (Hassall, Reyle

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The Accumulation of L-Ornithine in Halo-Blight Infected Bean Plants (Phaseolus vulgaris L.), Induced by the Toxin of the Pathogen Pseudomonas phaseolicola (Burkh.) Dowson

“…However, ornithine can participate in various metabolic pathways of the plant (REUTER 1960). It may arise from glutamic acid via glutamic semialdehyde (FOWDEN 1958), its formation from arginine via citrulline (KNIVETT 1951, BOULTER andBARBER 1963) seems improbable in our case. On the other hand ornithine can be easily converted to glutamic acid, proline, or used for alkaloid synthesis (RAMSTAD andAGURELL 1964, JINDRA et al 1960).…”