Stabilization of chlorophyll a-binding apoproteins P700, CP47, CP43, D2, and D1 by chlorophyll a or Zn-pheophytin a.

The Journal of Biological Chemistry
L A EichackerB Müller

Abstract

Stabilization of chlorophyll a-binding apoproteins P700, CP47, CP43, D2, and D1 against proteolytic degradation has been investigated through in vitro synthesis of chlorophyll a or Zn-pheophytin a in intact etioplasts from barley. Stabilization of the apoproteins was dependent on the concentration of chlorophyll a or Zn-pheophytin a. Zn-pheophytin a was superior to chlorophyll a with respect to the concentration of pigment required for an equal yield of the stabilized chlorophyll a protein CP47, CP43, and P700 and for the total yield of chlorophyll a proteins. Zn-pheophytin a was most efficient for stabilizing CP47 and, at an increased concentration, efficient for stabilizing CP43, P700, and D1. Stabilization of apoproteins was highest after de novo synthesis of 90-300 pmol of Zn-pheophytin a or of about 400-600 pmol of chlorophyll a/4.2 x 10(7) etioplasts. The yield of stabilized chlorophyll proteins decreased at higher concentrations of Zn-pheophytin a, but was unaffected by higher concentrations of chlorophyll a.

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