Abstract：
:Recent studies report mitochondrial carrier homolog 2 (MTCH2) as a novel and uncharacterized protein that acts as a receptor-like protein for the truncated BH3-interacting domain death agonist (tBID) protein in the outer membrane of mitochondria. These studies, using mouse embryonic stem cells and fibroblasts as well as mice with a conditional knockout of MTCH2 in the liver, showed that deletion of MTCH2 hindered recruitment of tBID to the mitochondria with subsequent reductions in the activation of pro-apoptotic proteins, mitochondrial outer membrane permeabilization and apoptosis. Sequence analysis shows that MTCH2 is present in all examined multicellular Metazoa as well as unicellular Choanoflagellata, and is a highly derived member of the mitochondrial carrier family. Mitochondrial carriers are monomeric transport proteins that are usually found in the inner mitochondrial membrane, where they exchange small substrates between the mitochondrial matrix and intermembrane space. There are extensive differences between the protein sequences of MTCH2 and other mitochondrial carriers that may explain the ability of MTCH2 to associate with tBID and thus its role in apoptosis. We review the experimental evidence for the role of MTCH2 in apoptosis and suggest that the original transport function of the ancestral MTCH2 mitochondrial carrier has been co-opted by the apoptotic machinery to provide a receptor and signaling mechanism.
journal_name
Exp Cell Resjournal_title
Experimental cell researchauthors
Robinson AJ,Kunji ER,Gross Adoi
10.1016/j.yexcr.2012.01.026subject
Has Abstractpub_date
2012-07-01 00:00:00pages
1316-23issue
11eissn
0014-4827issn
1090-2422pii
S0014-4827(12)00047-Xjournal_volume
318pub_type
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