Journal
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
Volume 108, Issue 37, Pages 15179-15183Publisher
NATL ACAD SCIENCES
DOI: 10.1073/pnas.1105921108
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Funding
- Ministry of Education, Culture, Sports, Science and Technology of Japan (MEXT)
- Japan Science and Technology Corporation (JST)
- Grants-in-Aid for Scientific Research [22227003, 19058005, 09J08047] Funding Source: KAKEN
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Mitochondrial protein import requires cooperation of the machineries called translocators in the outer and inner mitochondrial membranes. Here we analyze the interactions of Tom22, a multifunctional subunit of the outer membrane translocator TOM40 complex, with other translocator subunits such as Tom20, Tom40, and Tim50 and with substrate precursor proteins at a spatial resolution of the amino acid residue by in vivo and in organello site-specific photocross-linking. Changes in cross-linking patterns caused by excess substrate precursor proteins or presequence peptides indicate how the cytosolic receptor domain of Tom22 accepts substrate proteins and how the intermembrane space domain of Tom22 transfers them to Tim50 of the inner-membrane translocator.
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