"In organello formaldehyde crosslinking of proteins to mtDNA: identification of bifunctional proteins."

"Yeast mitochondrial dehydrogenases are associated in a supramolecular complex."

"Antifolding activity of hsp60 couples protein import into the mitochondrial matrix with export to the intermembrane space."

"Hsp60 bound to DHFR in the course of thermal denaturation, preventing its aggregation, and mediated its adenosine triphosphate-dependent refolding at increased temperatures."

"The Hsp60 was required to prevent the thermal inactivation in vivo of native dihydrofolate reductase (DHFR) imported into mitochondria."

"A function for the mitochondrial chaperonin Hsp60 in the structure and transmission of mitochondrial DNA nucleoids in Saccharomyces cerevisiae."

"Functional pre-existing hsp60 complex is required in order to form new, assembled, 14-mer."

"A nuclear encoded mitochondrial heat-shock protein hsp60 is required for the assembly into oligomeric complexes of proteins imported into the mitochondrial matrix."

"When dimeric ribulose-1,5-bisphosphate carboxylase (Rubisco) is denatured and allowed to bind to yeast cpn60, subsequent refolding of Rubisco is strictly dependent upon yeast cpn10."

"Loss of mitochondrial hsp60 function: nonequivalent effects on matrix-targeted and intermembrane-targeted proteins."

"In the presence of ADP, one molecule of hsp10 binds to hsp60 with an apparent Kd of 0.9 nM and a second molecule of hsp10 binds with a Kd of 24 nM."

"In the presence of ATP, the purified yeast chaperonins mediate the refolding of mitochondrial malate dehydrogenase."

"Hsp10 inhibits the ATPase activity of hsp60 by about 40%."

"ATP-dependent **protein folding chaperonin** for mitochondrial matrix proteins, particularly those imported into mitochondria as unfolded precursors. (verghese2012biologyofthe pages 29-30, cabiscol2002mitochondrialhsp60resistance pages 1-1)"

"Hsp60 does not catalyze a chemical transformation of a small molecule substrate; rather, it catalyzes **conformational maturation of polypeptides** by providing a protected folding environment and coordinating binding/release with ATP hydrolysis and Hsp10 capping."

"In yeast specifically, Hsp60 forms a **14-subunit double-ring (two heptameric rings)**, creating a cavity that can accommodate client proteins up to ~**50 kDa**, and imported precursor proteins transiently associate with Hsp60 as incompletely folded intermediates before ATP-dependent folding/release."

"the co-chaperonin **Hsp10 (GroES-like)** caps the cavity (“lid”), enabling an encapsulated folding environment; ATP hydrolysis and nucleotide exchange govern release/reset."

"Yeast Hsp60 is produced as a **mitochondrial precursor** with an N-terminal matrix-targeting presequence, cleaved by MPP after residue 21, consistent with mitochondrial import and processing to a mature matrix protein."

"HSP60 is **essential for viability**: deletion/null mutants are inviable due to severe mitochondrial folding defects."

"Representative mitochondrial proteins discussed as Hsp60-dependent/affected in yeast reviews include **F1-ATPase subunits**, **cytochrome b2**, and the **Rieske Fe–S protein**; conditional mutants can accumulate **insoluble matrix aggregates**."

"A temperature-sensitive **mif4** allele (Gly298→Asp) has been reported to cause the existing ~**840 kDa** Hsp60 complex to become insoluble within ~2 hours after temperature shift, pelleting at 15,000×g; this phenotype is described in a chaperonin chronologue review synthesizing genetic/biochemical evidence."

"The same work reports Hsp60 is induced **2–3× at 42°C** and that protection of Fe/S enzymes from oxidative inactivation is **dose-dependent** on Hsp60 levels; reduced Hsp60 increased the labile iron pool (calcein assay), and iron chelation (deferoxamine) partially rescued survival and oxidation phenotypes."

"In broader eukaryotic contexts, HSP60 is predominantly mitochondrial and can also be detected in extra-mitochondrial compartments; one 2024 review summarizes a distribution of ~**80–85% mitochondrial** and ~**15–20% cytoplasmic** for HSP60 (not yeast-specific)."