A leucine aminopeptidase is involved in kinetoplast DNA segregation in Trypanosoma brucei.

Abstract:

:The kinetoplast (k), the uniquely packaged mitochondrial DNA of trypanosomatid protists is formed by a catenated network of minicircles and maxicircles that divide and segregate once each cell cycle. Although many proteins involved in kDNA replication and segregation are now known, several key steps in the replication mechanism remain uncharacterized at the molecular level, one of which is the nabelschnur or umbilicus, a prominent structure which in the mammalian parasite Trypanosoma brucei connects the daughter kDNA networks prior to their segregation. Here we characterize an M17 family leucyl aminopeptidase metalloprotease, termed TbLAP1, which specifically localizes to the kDNA disk and the nabelschur and represents the first described protein found in this structure. We show that TbLAP1 is required for correct segregation of kDNA, with knockdown resulting in delayed cytokinesis and ectopic expression leading to kDNA loss and decreased cell proliferation. We propose that TbLAP1 is required for efficient kDNA division and specifically participates in the separation of daughter kDNA networks.

journal_name

PLoS Pathog

journal_title

PLoS pathogens

authors

Peña-Diaz P,Vancová M,Resl C,Field MC,Lukeš J

doi

10.1371/journal.ppat.1006310

subject

Has Abstract

pub_date

2017-04-07 00:00:00

pages

e1006310

issue

4

eissn

1553-7366

issn

1553-7374

pii

PPATHOGENS-D-16-01055

journal_volume

13

pub_type

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