Diagenode

An essential novel component of the non-canonical mitochondrial outer membrane protein import system of trypanosomatids.


Pusnik M, Mani J, Schmidt O, Niemann M, Oeljeklaus S, Schnarwiler F, Warscheid B, Lithgow T, Meisinger C, Schneider A.

The mitochondrial outer membrane protein Tom40 is the general entry gate for imported proteins in essentially all eukaryotes. Trypanosomatids however lack Tom40 and use instead a protein termed the archaic translocase of the outer mitochondrial membrane (ATOM). Here we report the discovery of pATOM36, a novel essential component of the trypanosomal outer membrane protein import system that interacts with ATOM. pATOM36 is not related to known Tom proteins from other organisms and mediates the import of matrix proteins. However, there is a group of precursor proteins whose import is independent of pATOM36. Domain swapping experiments indicate that the N-terminal presequence-containing domain of the substrate proteins at least in part determines the dependence on pATOM36. Secondary structure profiling suggests pATOM36 is composed largely of α-helices and its assembly into the outer membrane is independent of the SAM complex. Taken together, these results show that pATOM36 is a novel component associated with the ATOM complex that promotes the import of a subpopulation of proteins into the mitochondrial matrix.

Tags
Antibody

Share this article

Published
July, 2012

Source

Products used in this publication

  • Antibody ChIP icon
    C15200054
    Ty1 Antibody

Events

  • AACR 2024
    San Diego, California, USA
    Apr 5-Apr 10, 2024
 See all events

News

 See all news


The European Regional Development Fund and Wallonia are investing in your future.

Extension of industrial buildings and new laboratories.


       Site map   |   Contact us   |   Conditions of sales   |   Conditions of purchase   |   Privacy policy   |   Diagenode Diagnostics