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1.2.31 Sironval, 1967
In 1967, Sironval et al., proposed that the Pchl(ide)
a
holochrome acts as a shuttling
photoenzyme that catalyzes the conversion of Pchlide
a
to Chlide
a
(Sironval
et al.
1967
).
1.2.32 Shemin, 1968
In 1968, Shemin, proposed a detailed mechanism of the mode of action of ALA
dehydratase, the enzyme that converts 2 moles of ALA to PBG (Shemin
1968
).
1.2.33 Ellsworth and Aronoff, 1969
In 1969, Ellsworth and Aronoff, detected intermediates between Mpe and Pchlide
a
involving putative DV and MV metal-free acrylic, hydroxy and keto tetrapyrrole
derivatives in ultraviolet
Chlorella
mutants, and proposed that in plants, the forma-
tion of DV and MV Pchlide involves a
-oxidation sequence of the methyl propio-
nate of DV and novel MV Mpe, at position 6 of the macrocycle. They also proposed
a MV/DV biosynthetic loop that started at Mpe and finished at Pchlide (Ellsworth
and Aronoff
1969
).
β
1.2.34 Rebeiz, 1970
In 1970, Rebeiz et al., reported that kinetic analysis of the formation of the
14
C-Pchl
(ide)
a
pool, does not support the currently accepted notion that Pchlide
a
is the
immediate precursor of Pchlide
a
phytyl ester. This observation constituted the first
evidence of a potential Chl biosynthetic heterogeneity in plants (Rebeiz et al.
1970
).
1.2.35 Rebeiz and Castelfranco, 1971a
In 1971, reported the total biosynthesis of
14
C-Pchlide
a
and its phytyl ester
from
14
C-ALA in an in organello system from higher plants (Rebeiz and
Castelfranco
1971a
).
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