The interaction network of the chaperonin CCT.
The eukaryotic cytosolic chaperonin containing TCP-1 (CCT) has an important function in maintaining cellular homoeostasis by assisting the folding of many proteins, including the cytoskeletal components actin and tubulin. Yet the nature of the proteins and cellular pathways dependent on CCT function has not been established globally. Here, we use proteomic and genomic approaches to define CCT interaction networks involving 136 proteins/genes that include links to the nuclear pore complex, chromatin remodelling, and protein degradation. Our study also identifies a third eukaryotic cytoskeletal system connected with CCT: the septin ring complex, which is essential for cytokinesis. CCT interactions with septins are ATP dependent, and disrupting the function of the chaperonin in yeast leads to loss of CCT-septin interaction and aberrant septin ring assembly. Our results therefore provide a rich framework for understanding the function of CCT in several essential cellular processes, including epigenetics and cell division.
Cancer Research UK Centre for Cell and Molecular Biology, Chester Beatty Laboratories, Institute of Cancer Research, London, UK.
Carien
C
Dekker
Peter C
PC
Stirling
Elizabeth A
EA
McCormack
Heather
H
Filmore
Angela
A
Paul
Renee L
RL
Brost
Michael
M
Costanzo
Charles
C
Boone
Michel R
MR
Leroux
Keith R
KR
Willison
D056404:Chaperonin Containing TCP-1; D018833:Chaperonins / Q000378:metabolism*; D048749:Cytokinesis; D023281:Genomics; D046912:Multiprotein Complexes / Q000378:metabolism; D040901:Proteomics; D012441:Saccharomyces cerevisiae / Q000166:cytology / Q000378:metabolism*; D029701:Saccharomyces cerevisiae Proteins / Q000378:metabolism*
D046912:Multiprotein Complexes; D029701:Saccharomyces cerevisiae Proteins; D056404:Chaperonin Containing TCP-1; D018833:Chaperonins