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• W1839052904 endingPage "3057" @default.
• W1839052904 startingPage "3050" @default.
• W1839052904 abstract "We have created yeast strains in which the mitochondrial chaperonin, hsp60, can be either physically depleted or functionally inactivated. Cells completely depleted of hsp60 stop growing but retain for awhile the capacity to reaccumulate hsp60. While this newly made hsp60 is targeted to and processed correctly within the mitochondrion, assembly of a functional hsp60 complex does not occur. Rather, the hsp60 monomers are localized in different-size soluble complexes containing another mitochondrial chaperone, the mitochondrial form of hsp70. A number of other mitochondrial matrix-targeted proteins synthesized in the absence of functional hsp60 are imported into mitochondria but often show some buildup of precursor forms and, unlike hsp60, accumulate as insoluble aggregates. By contrast, several mitochondrial proteins normally targeted to the intermembrane space show normal processing in the complete absence of a functional hsp60 complex. Similar and complementary results were obtained when we examined the metabolism of matrix- and intermembrane space-localized proteins in cells expressing three different temperature-sensitive alleles of HSP60. In all cases, matrix-targeted proteins synthesized at nonpermissive (i.e., hsp60-inactivating) temperatures were correctly targeted to and processed within mitochondria but accumulated predominantly or totally as insoluble aggregates. The metabolism of two intermembrane space proteins, cytochrome b2 and cytochrome c1, was unaffected at the nonpermissive temperature, as judged by the correct processing and complete solubility of newly synthesized forms of both proteins. These findings are discussed with regard to current models of intermembrane targeting." @default.
• W1839052904 created "2016-06-24" @default.
• W1839052904 creator A5014241066 @default.
• W1839052904 creator A5026597265 @default.
• W1839052904 creator A5080715693 @default.
• W1839052904 date "1993-05-01" @default.
• W1839052904 modified "2023-10-18" @default.
• W1839052904 title "Loss of mitochondrial hsp60 function: nonequivalent effects on matrix-targeted and intermembrane-targeted proteins." @default.
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• W1839052904 doi "https://doi.org/10.1128/mcb.13.5.3050" @default.
• W1839052904 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/359697" @default.
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• W1839052904 hasPublicationYear "1993" @default.
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