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2016 ; 7
(44
): 71182-71197
Nephropedia Template TP
gab.com Text
Twit Text FOAVip
Twit Text #
English Wikipedia
A first generation inhibitor of human Greatwall kinase, enabled by structural and
functional characterisation of a minimal kinase domain construct
#MMPMID27563826
Ocasio CA
; Rajasekaran MB
; Walker S
; Le Grand D
; Spencer J
; Pearl FM
; Ward SE
; Savic V
; Pearl LH
; Hochegger H
; Oliver AW
Oncotarget
2016[Nov]; 7
(44
): 71182-71197
PMID27563826
show ga
MASTL (microtubule-associated serine/threonine kinase-like), more commonly known
as Greatwall (GWL), has been proposed as a novel cancer therapy target. GWL plays
a crucial role in mitotic progression, via its known substrates ENSA/ARPP19,
which when phosphorylated inactivate PP2A/B55 phosphatase. When over-expressed in
breast cancer, GWL induces oncogenic properties such as transformation and
invasiveness. Conversely, down-regulation of GWL selectively sensitises tumour
cells to chemotherapy. Here we describe the first structure of the GWL minimal
kinase domain and development of a small-molecule inhibitor GKI-1 (Greatwall
Kinase Inhibitor-1). In vitro, GKI-1 inhibits full-length human GWL, and shows
cellular efficacy. Treatment of HeLa cells with GKI-1 reduces ENSA/ARPP19
phosphorylation levels, such that they are comparable to those obtained by siRNA
depletion of GWL; resulting in a decrease in mitotic events, mitotic arrest/cell
death and cytokinesis failure. Furthermore, GKI-1 will be a useful starting point
for the development of more potent and selective GWL inhibitors.