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Internal targeting signal of the BCS1 protein: a novel mechanism of import into mitochondria.
Institut für Physiologische Chemie der Universität München, Germany.
The BCS1 protein is anchored in the mitochondrial inner membrane via a single transmembrane domain and has an N(out)-C(in) topology. Unlike the majority of nuclear encoded mitochondrial preproteins, the BCS1 protein does not contain an N-terminal targeting sequence. A positively charged segment of amino acids which is located immediately C-terminal to the transmembrane domain acts as an internal targeting signal. In order to function, we postulate that this sequence co-operates with the transmembrane domain to form a tight hairpin loop structure. This loop is translocated across the inner membrane via the MIM/mt-Hsp70 machinery in a membrane potential-dependent manner. This novel mechanism of import and sorting of the BCS1 protein is proposed to represent a more general mechanism used by a number of inner membrane proteins.
PMID: 8599931 [PubMed - indexed for MEDLINE]
PMCID: PMC449966
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Cited by 26 PubMed Central articles
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[Biochem J. 2004]
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