Pterobitine and neopterobilines, reactivity and structures. Summary. Pterobilinc (bilivcrdinc I X y ) and the two neopterobilines : phorcabiline and sarpedobiline. are thc threc main bile pigments found in Lepidopters. Studies on thc reactivity of pterobilinc (I) and phorcabiline esters are reported. Preparation of dcrivatives, in witro transformation of pterobilinc into phorcabiline, analysis of the pigments and their derivatives by field desorption mass spectrometry and Fozcvier transform NMR., lead t o the structure 5 for the dimethyl ester of phorcabilinc.By a similar reaction, biliverdine IX 8 (15) affords the neobiliverdine IX 6 (16). Possibility of an easy formation of new tetrapyrrolic compounds in the TX y and IX B serics is thus reported for the first time.
La biosynthèse de la proferrorosamine A produite par Pseudomonas roseus fluorescens est inhibée par le tryptophane et cette inhibition est levée par l'acide shikimique. A la suite de l'ensemble des résultats acquis, des hypothèses concernant le rôle métabolique de la proferrorosamine A sont formulées et discutées.
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