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2016 ; 291
(39
): 20753-65
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Structural Insight into the 14-3-3 Protein-dependent Inhibition of Protein Kinase
ASK1 (Apoptosis Signal-regulating kinase 1)
#MMPMID27514745
Petrvalska O
; Kosek D
; Kukacka Z
; Tosner Z
; Man P
; Vecer J
; Herman P
; Obsilova V
; Obsil T
J Biol Chem
2016[Sep]; 291
(39
): 20753-65
PMID27514745
show ga
Apoptosis signal-regulating kinase 1 (ASK1, also known as MAP3K5), a member of
the mitogen-activated protein kinase kinase kinase (MAP3K) family, regulates
diverse physiological processes. The activity of ASK1 is triggered by various
stress stimuli and is involved in the pathogenesis of cancer, neurodegeneration,
inflammation, and diabetes. ASK1 forms a high molecular mass complex whose
activity is, under non-stress conditions, suppressed through interaction with
thioredoxin and the scaffolding protein 14-3-3. The 14-3-3 protein binds to the
phosphorylated Ser-966 motif downstream of the ASK1 kinase domain. The role of
14-3-3 in the inhibition of ASK1 has yet to be elucidated. In this study we
performed structural analysis of the complex between the ASK1 kinase domain
phosphorylated at Ser-966 (pASK1-CD) and the 14-3-3? protein. Small angle x-ray
scattering (SAXS) measurements and chemical cross-linking revealed that the
pASK1-CD·14-3-3? complex is dynamic and conformationally heterogeneous. In
addition, structural analysis coupled with the results of phosphorus NMR and
time-resolved tryptophan fluorescence measurements suggest that 14-3-3? interacts
with the kinase domain of ASK1 in close proximity to its active site, thus
indicating this interaction might block its accessibility and/or affect its
conformation.