Rubredoxin 1 Is Required for Formation of the Functional Photosystem II Core Complex in

Overview

Journal Front Plant Sci

Date 2022 Mar 14

PMID 35283894

Authors

Liping Che

Han Meng

Junxiang Ruan

Lianwei Peng

Lin Zhang

Affiliations

Soon will be listed here.

Abstract

Chloroplast thylakoid protein rubredoxin 1 (RBD1) in Chlamydomonas and its cyanobacterial homolog RubA contain a rubredoxin domain. These proteins have been proposed to participate in the assembly of photosystem II (PSII) at early stages. However, the effects of inactivation of RBD1 on PSII assembly in higher plants are largely unclear. Here, we characterized an Arabidopsis mutant in detail. A drastic reduction of intact PSII complex but relatively higher levels of assembly intermediates including PSII RC, pre-CP47, and pre-CP43 were found in . Polysome association and ribosome profiling revealed that ribosome recruitment of mRNA is specifically reduced. Consistently, protein pulse-chase labeling showed that the rate of D1/pD1 synthesis is significantly reduced in compared with WT. Moreover, newly synthesized mature D1 and pD1/D2 can assemble into the PSII reaction center (RC) complex but further formation of larger PSII complexes is nearly totally blocked in . Our data imply that RBD1 is not only required for the formation of a functional PSII core complex during the early stages of PSII assembly but may also be involved in the translation of D1 in higher plants.

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