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A constitutive form of heat-shock protein 70 is located in the outer membranes of mitochondria from rat liver
- Source :
- ResearcherID
- Publication Year :
- 1993
- Publisher :
- Wiley, 1993.
-
Abstract
- HSP73, the constitutive form of heat-shock protein 70, has been implicated in the translocation of preproteins across the mitochondrial membranes, being required for maintaining mitochondrial preproteins in an import competent conformation. Here we report that highly purified mitochondrial outer membranes contain a protein indistinguishable from HSP73 as a tightly associated peripheral component of the membrane. This membrane form of HSP73 was photolabelled with [α-32P]ATP and could be released from the outer membrane with sodium carbonate, but not after incubation of the membranes with salt or with ATP. A sensitive immunoassay with an anti-HSP73 monoclonal antibody, revealed the association of HSP73 with mitochondrial outer membrane vesicles at a level similar to that of preprotein import receptors.
- Subjects :
- Mitochondrial intermembrane space
Translocase of the outer membrane
Immunoblotting
Submitochondrial Particles
Biophysics
Enzyme-Linked Immunosorbent Assay
Mitochondria, Liver
Photolabelling
Biochemistry
Mitochondrial membrane transport protein
Adenosine Triphosphate
Structural Biology
F-ATPase
Genetics
Animals
Electrophoresis, Gel, Two-Dimensional
Inner mitochondrial membrane
Molecular Biology
Heat-Shock Proteins
Mitochondrial import
biology
Outer-membrane
Membrane Proteins
Intracellular Membranes
Cell Biology
Mitochondrial carrier
Rats
Molecular Weight
Heat-shock protein
Translocase of the inner membrane
biology.protein
Electrophoresis, Polyacrylamide Gel
ATP–ADP translocase
Subjects
Details
- ISSN :
- 00145793
- Volume :
- 332
- Database :
- OpenAIRE
- Journal :
- FEBS Letters
- Accession number :
- edsair.doi.dedup.....46230c91047428594ca3f5ec12009b77