The plastid-dividing machinery: formation, constriction and fission.

Yamato Yoshida, Shin-ya Miyagishima, Haruko Kuroiwa, Tsuneyoshi Kuroiwa

Journal: Current opinion in plant biology 2013;15(6):714-21

PMID: 22824141

Full Text on Elsevier Science View on PubMed

Abstract

Plastids divide by constriction of the plastid-dividing (PD) machinery, which encircles the division site. The PD machinery consists of the stromal inner machinery which includes the inner PD and filamenting temperature-sensitive mutant Z (FtsZ) rings and the cytosolic outer machinery which includes the outer PD and dynamin rings. The major constituent of the PD machinery is the outer PD ring, which consists of a bundle of polyglucan filaments. In addition, recent proteomic studies suggest that the PD machinery contains additional proteins that have not been characterized. The PD machinery forms from the inside to the outside of the plastid. The constriction seems to occur by sliding of the polyglucan filaments of the outer PD ring, aided by dynamin. The final fission of the plastid is probably promoted by the 'pinchase' activity of dynamin.

Address: Initiative Research Unit, College of Science, Rikkyo University, Toshima, Tokyo 171-8501, Japan.

DOI: 10.1016/j.pbi.2012.07.002

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MeSH Terms: Arabidopsis, Arabidopsis Proteins, Biological Evolution, Chloroplast Proteins, Cytosol, Dynamins, Glucans, Intracellular Membranes, Membrane Proteins, Mitochondria, Mitochondrial Dynamics, Plastids, Protein Transport