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Mba1, a membrane‐associated ribosome receptor in mitochondria
Author(s) -
Ott Martin,
Prestele Martin,
Bauerschmitt Heike,
Funes Soledad,
Bonnefoy Nathalie,
Herrmann Johannes M
Publication year - 2006
Publication title -
the embo journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 7.484
H-Index - 392
eISSN - 1460-2075
pISSN - 0261-4189
DOI - 10.1038/sj.emboj.7601070
Subject(s) - biology , ribosome , translocase of the inner membrane , microbiology and biotechnology , inner mitochondrial membrane , mitochondrial membrane transport protein , inner membrane , mitochondrial carrier , translocase of the outer membrane , mitochondrion , protein targeting , biochemistry , membrane protein , chaperone (clinical) , ribosome profiling , bacterial outer membrane , membrane , rna , gene , medicine , escherichia coli , pathology
The genome of mitochondria encodes a small number of very hydrophobic polypeptides that are inserted into the inner membrane in a cotranslational reaction. The molecular process by which mitochondrial ribosomes are recruited to the membrane is poorly understood. Here, we show that the inner membrane protein Mba1 binds to the large subunit of mitochondrial ribosomes. It thereby cooperates with the C‐terminal ribosome‐binding domain of Oxa1, which is a central component of the insertion machinery of the inner membrane. In the absence of both Mba1 and the C‐terminus of Oxa1, mitochondrial translation products fail to be properly inserted into the inner membrane and serve as substrates of the matrix chaperone Hsp70. We propose that Mba1 functions as a ribosome receptor that cooperates with Oxa1 in the positioning of the ribosome exit site to the insertion machinery of the inner membrane.