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2018 ; 8
(1
): 10064
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A selective high affinity MYC-binding compound inhibits MYC:MAX interaction and
MYC-dependent tumor cell proliferation
#MMPMID29968736
Castell A
; Yan Q
; Fawkner K
; Hydbring P
; Zhang F
; Verschut V
; Franco M
; Zakaria SM
; Bazzar W
; Goodwin J
; Zinzalla G
; Larsson LG
Sci Rep
2018[Jul]; 8
(1
): 10064
PMID29968736
show ga
MYC is a key player in tumor development, but unfortunately no specific
MYC-targeting drugs are clinically available. MYC is strictly dependent on
heterodimerization with MAX for transcription activation. Aiming at targeting
this interaction, we identified MYCMI-6 in a cell-based protein interaction
screen for small inhibitory molecules. MYCMI-6 exhibits strong selective
inhibition of MYC:MAX interaction in cells and in vitro at single-digit
micromolar concentrations, as validated by split Gaussia luciferase, in situ
proximity ligation, microscale thermophoresis and surface plasmon resonance (SPR)
assays. Further, MYCMI-6 blocks MYC-driven transcription and binds selectively to
the MYC bHLHZip domain with a K(D) of 1.6?±?0.5??M as demonstrated by SPR.
MYCMI-6 inhibits tumor cell growth in a MYC-dependent manner with IC(50)
concentrations as low as 0.5??M, while sparing normal cells. The response to
MYCMI-6 correlates with MYC expression based on data from 60 human tumor cell
lines and is abrogated by MYC depletion. Further, it inhibits MYC:MAX
interaction, reduces proliferation and induces massive apoptosis in tumor tissue
from a MYC-driven xenograft tumor model without severe side effects. Since
MYCMI-6 does not affect MYC expression, it is a unique molecular tool to
specifically target MYC:MAX pharmacologically and it has good potential for drug
development.