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- Title
Thylakoid protein FPB1 synergistically cooperates with PAM68 to promote CP47 biogenesis and Photosystem II assembly.
- Authors
Zhang, Lin; Ruan, Junxiang; Gao, Fudan; Xin, Qiang; Che, Li-Ping; Cai, Lujuan; Liu, Zekun; Kong, Mengmeng; Rochaix, Jean-David; Mi, Hualing; Peng, Lianwei
- Abstract
In chloroplasts, insertion of proteins with multiple transmembrane domains (TMDs) into thylakoid membranes usually occurs in a co-translational manner. Here, we have characterized a thylakoid protein designated FPB1 (Facilitator of PsbB biogenesis1) which together with a previously reported factor PAM68 (Photosynthesis Affected Mutant68) is involved in assisting the biogenesis of CP47, a subunit of the Photosystem II (PSII) core. Analysis by ribosome profiling reveals increased ribosome stalling when the last TMD segment of CP47 emerges from the ribosomal tunnel in fpb1 and pam68. FPB1 interacts with PAM68 and both proteins coimmunoprecipitate with SecY/E and Alb3 as well as with some ribosomal components. Thus, our data indicate that, in coordination with the SecY/E translocon and the Alb3 integrase, FPB1 synergistically cooperates with PAM68 to facilitate the co-translational integration of the last two CP47 TMDs and the large loop between them into thylakoids and the PSII core complex.The assembly of the Photosystem II proximal antenna CP47 remains a challenging question. Here the authors show that FPB1 and PAM68 act coordinately with Alb3 and the SecY/E translocon to facilitate the co-translational integration of specific regions of CP47 into thylakoids.
- Publication
Nature Communications, 2024, Vol 15, Issue 1, p1
- ISSN
2041-1723
- Publication type
Article
- DOI
10.1038/s41467-024-46863-y