Assembly of Peroxisomal Membrane Proteins via the Direct Pex19p-Pex3p Pathway

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Yuqiong LiuYukio Fujiki

Abstract

Correct targeting of peroxisomal membrane proteins (PMPs) is essential for the formation and maintenance of functional peroxisomes. Activities of Pex19p to interact with PMPs on one hand and Pex3p on the other, including formation of ternary complexes between Pex19p, PMP and Pex3p, strongly support posttranslational translocation of PMPs via the Pex19p- and Pex3p-dependent direct pathway, termed the class I pathway. However, it remains elusive whether Pex19p-PMP complexes are indeed capable of being imported into peroxisomal membranes through the interaction between Pex19p and Pex3p. We resolve this issue by investigating the targeting process of several topologically distinct PMPs, including multimembrane spanning PMPs. We show here that Pex19p forms cytosolic complexes with PMPs and directly translocates them to peroxisomes. Using a semi-intact mammalian cell-based import assay system, we prove that PMPs in the cytosolic complexes are imported into peroxisomes via the interaction between cargo-loaded Pex19p and Pex3p. Furthermore, we demonstrate for the first time that peroxisomal targeting of ATAD1, an N-terminally signal-anchored protein that resides on both mitochondria and peroxisomes, is also achieved through the Pex19p-...Continue Reading

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Citations

Mar 8, 2018·Cells·Bor Luen Tang
Dec 10, 2017·The Journal of Cell Biology·Kanji OkumotoYukio Fujiki
Dec 12, 2018·EMBO Reports·Jean-Claude FarréSuresh Subramani
Dec 13, 2016·Proceedings of the Japan Academy. Series B, Physical and Biological Sciences·Yukio Fujiki
Mar 27, 2020·The Journal of Cell Biology·Fred D MastJohn D Aitchison
Oct 13, 2020·Frontiers in Cell and Developmental Biology·Masanori HonshoYukio Fujiki
Jan 14, 2021·Biochemical Society Transactions·Logan P Crowe, Meredith T Morris
Nov 1, 2020·International Journal of Molecular Sciences·Masanori HonshoYukio Fujiki

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