TbLOK1/ATOM19 is a novel subunit of the noncanonical mitochondrial outer membrane protein translocase of Trypanosoma brucei

Desy, Silvia Franziska; Mani, Jan; Harsman, Anke Judith; Käser, Sandro; Schneider, André (2016). TbLOK1/ATOM19 is a novel subunit of the noncanonical mitochondrial outer membrane protein translocase of Trypanosoma brucei. Molecular microbiology, 102(3), pp. 520-529. Blackwell Science 10.1111/mmi.13476

	Text Desy-Mol-Micro.pdf - Published Version Restricted to registered users only Available under License Publisher holds Copyright. Download (1MB)
Preview	Text Desy-MolMicro-2016.pdf - Accepted Version Available under License Publisher holds Copyright. Download (7MB) | Preview

TbLOK1 has previously been characterized as a trypanosomatid-specific mitochondrial outer membrane protein whose ablation caused a collapse of the mitochondrial network, disruption of the membrane potential and loss of mitochondrial DNA. Here we show that ablation of TbLOK1 primarily abolishes mitochondrial protein import, both in vivo and in vitro. Co-immunprecipitations together with blue native gel analysis demonstrate that TbLOK1 is a stable and stoichiometric component of the archaic protein translocase of the outer membrane (ATOM), the highly diverged functional analogue of the TOM complex in other organisms. Furthermore, we show that TbLOK1 together with the other ATOM subunits forms a complex functional network where ablation of individual subunits either causes degradation of a specific set of other subunits or their exclusion from the ATOM complex. In summary these results establish that TbLOK1 is an essential novel subunit of the ATOM complex and thus that its primary molecular function is linked to mitochondrial protein import across the outer membrane. The previously described phenotypes can all be explained as consequences of the lack of mitochondrial protein import. We therefore suggest that in line with the nomenclature of the ATOM complex subunits, TbLOK1 should be renamed to ATOM19.

Interest & Impact

Downloads

30 since deposited on 24 Jan 2017
4 in the past 12 months

Citations

5 Citations in Web of Science ®
6 Citations in Scopus

Search

in Google Scholar™

Services

Actions (login required)

Edit item

Actions (login required)

Edit item