ISSN:
1617-4623
Quelle:
Springer Online Journal Archives 1860-2000
Thema:
Biologie
Notizen:
Summary A Mendelian mutant r-1 in chlamydomonas reinhardtii has been shown to make the synthesis of δ-aminolevulinic acid (ALA) insensitive to inhibition by protoporphyrin. We have now combined the r-1 mutant with the protochlorophyllideaccumulating mutant y-1. From the phenotype of the double mutant y-1 r-1 and the phenocopy produced by feeding ALA to y-1, we conclude that r-1 also makes the synthesis of ALA insensitive to the inhibition by protochlorophyllide. To explain the fact that both ALA-fed y-1 and y-1 r-1 accumulate large amounts of protoporphyrin and smaller amounts of protochlorophyllide, we propose a new control feedback loop in the porphyrin biosynthetic pathway from protochlorophyllide to the step which converts protoporphyrin to magnesium protoporphyrin.
Materialart:
Digitale Medien
URL:
http://dx.doi.org/10.1007/BF00264933
Permalink