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2018 ; 5
(ä): 42
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Single-Ring Intermediates Are Essential for Some Chaperonins
#MMPMID29755985
Bhatt JM
; Enriquez AS
; Wang J
; Rojo HM
; Molugu SK
; Hildenbrand ZL
; Bernal RA
Front Mol Biosci
2018[]; 5
(ä): 42
PMID29755985
show ga
Chaperonins are macromolecular complexes found throughout all kingdoms of life
that assist unfolded proteins reach a biologically active state. Historically,
chaperonins have been classified into two groups based on sequence, subunit
structure, and the requirement for a co-chaperonin. Here, we present a brief
review of chaperonins that can form double- and single-ring conformational
intermediates in their protein-folding catalytic pathway. To date, the
bacteriophage encoded chaperonins ?-EL and OBP, human mitochondrial chaperonin
and most recently, the bacterial groEL/ES systems, have been reported to form
single-ring intermediates as part of their normal protein-folding activity. These
double-ring chaperonins separate into single-ring intermediates that have the
ability to independently fold a protein. We discuss the structural and functional
features along with the biological relevance of single-ring intermediates in
cellular protein folding. Of special interest are the ?-EL and OBP chaperonins
which demonstrate features of both group I and II chaperonins in addition to
their ability to function via single-ring intermediates.