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J. Biol. Chem., Vol. 265, Issue 23, 13566-13571, 08, 1990
LA Eichacker, J Soll, P Lauterbach, W Rudiger, RR Klein and JE Mullet
An in vitro translation system using lysed etioplasts was developed to test
if the accumulation of plastid-encoded chlorophyll a apoproteins is
dependent on the de novo synthesis of chlorophyll a. The P700 apoproteins,
CP47 and CP43, were not radiolabeled in pulsechase translation assays
employing lysed etioplasts in the absence of added chlorophyll precursors.
When chlorophyllide a plus phytylpyrophosphate were added to lysed
etioplast translation assays in the dark, chlorophyll a was synthesized and
radiolabeled P700 apoproteins, CP47 and CP43, and a protein which
comigrates with D1 accumulated. Chlorophyllide a or phytylpyrophosphate
added separately to the translation assay in darkness did not induce
chlorophyll a formation or chlorophyll a apoprotein accumulation.
Chlorophyll a formation and chlorophyll a apoprotein accumulation were also
induced in the lysed etioplast translation system by the photoreduction of
protochlorophyllide to chlorophyllide a in the presence of exogenous
phytylpyrophosphate. Accumulation of radiolabeled CP47 was detectable when
very low levels of chlorophyll a were synthesized de novo (less than 0.01
nmol/10(7) plastids), and radiolabel increased linearly with increasing de
novo chlorophyll a formation. Higher levels of de novo synthesized
chlorophyll a were required prior to detection of radiolabel incorporation
into the P700 apoproteins and CP43 (greater than 0.01 nmol/10(7) plastids).
Radiolabel incorporation into the P700 apoproteins, CP47 and CP43,
saturated at a chlorophyll a concentration which corresponds to 50% of the
etioplast protochlorophyllide content (0.06 nmol of chlorophyll a/10(7)
plastids).
In vitro synthesis of chlorophyll a in the dark triggers accumulation of chlorophyll a apoproteins in barley etioplasts
Department of Botany, University of Munich, Federal Republic of Germany.
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