The calcium-binding aspartate/glutamate carriers, citrin and aralar1, are new substrates for the DDP1/TIMM8a-TIMM13 complex.

Abstract:

:The biogenesis of the mitochondrial inner membrane is dependent on two distinct 70 kDa protein complexes. TIMM8a partners with TIMM13 in the mitochondrial intermembrane space to form a 70 kDa complex and facilitates the import of the inner membrane substrate TIMM23. We have identified a new class of substrates, citrin and aralar1, which are Ca2+-binding aspartate/glutamate carriers (AGCs) of the mitochondrial inner membrane, using cross-linking and immunoprecipitation assays in isolated mitochondria. The AGCs function in the aspartate-malate NADH shuttle that moves reducing equivalents from the cytosol to the mitochondrial matrix. Mohr-Tranebjaerg syndrome (MTS/DFN-1, deafness/dystonia syndrome) results from a mutation in deafness/dystonia protein 1/translocase of mitochondrial inner membrane 8a (DDP1/TIMM8a) and loss of the 70 kDa complex. A lymphoblast cell line derived from an MTS patient had decreased NADH levels and defects in mitochondrial protein import. Protein expression studies indicate that DDP1 and TIMM13 show non-uniform expression in mammals, and expression is prominent in the large neurons in the brain, which is in agreement with the expression pattern of aralar1. Thus, insufficient NADH shuttling, linked with changes in Ca2+ concentration, in sensitive cells of the central nervous system might contribute to the pathologic process associated with MTS.

journal_name

Hum Mol Genet

journal_title

Human molecular genetics

authors

Roesch K,Hynds PJ,Varga R,Tranebjaerg L,Koehler CM

doi

10.1093/hmg/ddh217

subject

Has Abstract

pub_date

2004-09-15 00:00:00

pages

2101-11

issue

18

eissn

0964-6906

issn

1460-2083

pii

ddh217

journal_volume

13

pub_type

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