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2017 ; 61
(5
): 505-516
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Molecular recognition of ternary complexes: a new dimension in the
structure-guided design of chemical degraders
#MMPMID29118097
Hughes SJ
; Ciulli A
Essays Biochem
2017[Nov]; 61
(5
): 505-516
PMID29118097
show ga
Molecular glues and bivalent inducers of protein degradation (also known as
PROTACs) represent a fascinating new modality in pharmacotherapeutics: the
potential to knockdown previously thought 'undruggable' targets at
sub-stoichiometric concentrations in ways not possible using conventional
inhibitors. Mounting evidence suggests these chemical agents, in concert with
their target proteins, can be modelled as three-body binding equilibria that can
exhibit significant cooperativity as a result of specific ligand-induced
molecular recognition. Despite this, many existing drug design and optimization
regimens still fixate on binary target engagement, in part due to limited
structural data on ternary complexes. Recent crystal structures of protein
complexes mediated by degrader molecules, including the first PROTAC ternary
complex, underscore the importance of protein-protein interactions and
intramolecular contacts to the mode of action of this class of compounds. These
discoveries have opened the door to a new paradigm for structure-guided drug
design: borrowing surface area and molecular recognition from nature to elicit
cellular signalling.