ER-mitochondria contacts promote mtDNA nucleoids active transportation via mitochondrial dynamic tubulation.

Abstract:

:A human cell contains hundreds to thousands of mitochondrial DNA (mtDNA) packaged into nucleoids. Currently, the segregation and allocation of nucleoids are thought to be passively determined by mitochondrial fusion and division. Here we provide evidence, using live-cell super-resolution imaging, that nucleoids can be actively transported via KIF5B-driven mitochondrial dynamic tubulation (MDT) activities that predominantly occur at the ER-mitochondria contact sites (EMCS). We further demonstrate that a mitochondrial inner membrane protein complex MICOS links nucleoids to Miro1, a KIF5B receptor on mitochondria, at the EMCS. We show that such active transportation is a mechanism essential for the proper distribution of nucleoids in the peripheral zone of the cell. Together, our work identifies an active transportation mechanism of nucleoids, with EMCS serving as a key platform for the interplay of nucleoids, MICOS, Miro1, and KIF5B to coordinate nucleoids segregation and transportation.

journal_name

Nat Commun

journal_title

Nature communications

authors

Qin J,Guo Y,Xue B,Shi P,Chen Y,Su QP,Hao H,Zhao S,Wu C,Yu L,Li D,Sun Y

doi

10.1038/s41467-020-18202-4

subject

Has Abstract

pub_date

2020-09-08 00:00:00

pages

4471

issue

1

issn

2041-1723

pii

10.1038/s41467-020-18202-4

journal_volume

11

pub_type

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