Related Experiment Video
Updated: Aug 13, 2026

In Situ Monitoring of Transiently Formed Molecular Chaperone Assemblies in Bacteria, Yeast, and Human Cells
Published on: September 2, 2019
Nested allosteric interactions in the cytoplasmic chaperonin containing TCP-1
G Kafri1, K R Willison, A Horovitz
1Department of Structural Biology, Weizmann Institute of Science, Rehovot 76100, Israel.
Abstract:
Initial rates of ATP hydrolysis by the chaperonin containing TCP-1 (CCT) from bovine testis were measured as a function of ATP concentration. Two allosteric transitions are observed: one at relatively low concentrations of ATP (<100 microM) and the second at higher concentrations of ATP. The data suggest that CCT has positive intra-ring cooperativity and negative inter-ring cooperativity in ATP hydrolysis, with respect to ATP, as previously observed in the case of GroEL. It is shown that the relatively weak positive intra-ring cooperativity found in the case of CCT may be due to heterogeneity in its subunit composition. Our results suggest that nested allosteric behavior may be common to chaperone double-ring systems.
Related Concept Videos
Cooperative Allosteric Transitions
Molecular Chaperones and Protein Folding
The...
Cooperative Allosteric Transitions
Allosteric Proteins-ATCase
Aspartate transcarbamoylase (ATCase) is a cytosolic enzyme that catalyzes the condensation of L-aspartate and carbamoyl phosphate to N-carbamoyl-L-aspartate. This reaction is the first step in pyrimidine biosynthesis. UTP and CTP, the end products of the pyrimidine synthesis pathway,...
Cooperative Allosteric Transitions
Molecular Chaperones and Protein Folding
The...

