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2018 ; 5
(Pt 2
): 200-210
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X-ray and cryo-EM structures of inhibitor-bound cytochrome bc(1) complexes for
structure-based drug discovery
#MMPMID29765610
Amporndanai K
; Johnson RM
; O'Neill PM
; Fishwick CWG
; Jamson AH
; Rawson S
; Muench SP
; Hasnain SS
; Antonyuk SV
IUCrJ
2018[Mar]; 5
(Pt 2
): 200-210
PMID29765610
show ga
Cytochrome bc(1), a dimeric multi-subunit electron-transport protein embedded in
the inner mitochondrial membrane, is a major drug target for the treatment and
prevention of malaria and toxoplasmosis. Structural studies of cytochrome bc(1)
from mammalian homologues co-crystallized with lead compounds have underpinned
structure-based drug design to develop compounds with higher potency and
selectivity. However, owing to the limited amount of cytochrome bc(1) that may be
available from parasites, all efforts have been focused on homologous cytochrome
bc(1) complexes from mammalian species, which has resulted in the failure of some
drug candidates owing to toxicity in the host. Crystallographic studies of the
native parasite proteins are not feasible owing to limited availability of the
proteins. Here, it is demonstrated that cytochrome bc(1) is highly amenable to
single-particle cryo-EM (which uses significantly less protein) by solving the
apo and two inhibitor-bound structures to ?4.1?Å resolution, revealing clear
inhibitor density at the binding site. Therefore, cryo-EM is proposed as a viable
alternative method for structure-based drug discovery using both host and
parasite enzymes.