explore
potential
interplay
between
trk
receptors
cdk5
first
examined
trk
receptors
associated
cdk5
p35
trka
trkb
trkc
overexpressed
together
cdk5
p35
cos7
cells
immunoprecipitation
performed
cdk5
p35
pan-trk
antibody
interestingly
three
trk
receptors
observed
associate
cdk5
figure
1b
p35
figure
1c
association
observed
immunoprecipitation
performed
igg
control
since
both
trkb
ligand
bdnf
abundantly
expressed
brain
throughout
development
next
proceeded
verify
interaction
between
trkb
cdk5/p35
postnatal
brains
found
trkb
associated
both
p35
cdk5
postnatal
day
p7
rat
brain
lysates
figure
1d
trka
trkb
trkc
overexpressed
cos7
cells
immunoprecipitated
pan-trk
antibody
incubation
cdk5/p25
revealed
trkb
trkc
trka
phosphorylated
cdk5/p25
vitro
figure
2a
agreement
lack
cdk5
consensus
sites
trka
points
possibility
cdk5
may
phosphorylate
trkb
trkc
cdk5
consensus
sites
juxtamembrane
region
figure
1a
examine
possibility
gst
fusion
protein
containing
only
juxtamembrane
region
trkb
prepared
immunoprecipitation
mg
protein
lysates
incubated
corresponding
antibody
overnight
rotation
forty
microliters
protein
sepharose
amersham
biosciences
pre-washed
pbs
added
rotated
h.
intense
washing
lysis
buffer
immunoprecipitated
protein
associated
proteins
analyzed
sds-page
western
blotting
cell
lysates
from
hek293t
cells
overexpressing
cdk5
trka
trkb
trkc
immunoprecipitated
ip
cdk5
antibody
immunoblotted
pan-trk
antibody
trka
trkb
trkc
observed
associate
cdk5
cell
lysates
from
hek293t
cells
overexpressing
p35
trka
trkb
trkc
immunoprecipitated
p35
antibody
immunoblotted
pan-trk
antibody
trka
trkb
trkc
observed
associate
p35
brain
lysate
from
p7
rat
brain
immunoprecipitated
pan-trk
p35
cdk5
antibody
immunoblotted
p35
cdk5
trkb
antibodies
rabbit
normal
igg
used
control
trkb
observed
associate
both
p35
cdk5
p7
rat
brain
brain
lysates
from
p7
p35
p35
mouse
brains
immunoprecipitated
p35
cdk5
antibodies
immunoblotted
p35
cdk5
trkb
antibodies
rabbit
normal
igg
served
control
association
between
cdk5
trkb
abolished
p35
brain
indicating
p35
required
association
between
cdk5
trkb
lysates
from
cos7
cells
overexpressing
trka
trkb
trkc
immunoprecipitated
pan-trk
antibody
incubated
cdk5/p25
vitro
kinase
assay
trkb
trkc
trka
phosphorylated
cdk5/p25
full-length
trkb
wt
m1
m2
dm
overexpressed
without
cdk5/p35
hek293t
cells
absence
cdk5/p35
ser478-phosphorylated
trkb
p-ser
trkb
detected
overexpression
cdk5/p35
resulted
phosphorylation
trkb
wt
ser478
phosphorylation
ser478
essentially
abolished
trkb
m1
dm
overexpressed
ip
immunoprecipitation
cortical
neurons
stimulated
bdnf
different
time
intervals
lysates
immunoprecipitated
ip
p35
antibody
subjected
vitro
kinase
assay
using
histone
h1
substrate
bdnf
stimulation
min
resulted
marked
increase
cdk5
activity
cortical
neurons
quantification
changes
phospho-histone
h1
level
following
bdnf
stimulation
normalized
value
obtained
from
untreated
cultures
time
shown
histogram
addition
trk
inhibitor
k252a
abolished
bdnf-induced
increase
cdk5
activity
cortical
neurons
pretreated
vehicle
control
dmso
k252a
min
before
stimulation
bdnf
min
lysates
immunoprecipitated
p35
antibody
subjected
vitro
kinase
assay
using
histone
h1
substrate
found
k252a
pretreatment
markedly
reduced
increase
cdk5
activity
triggered
bdnf
stimulation
indicating
induction
cdk5
activity
dependent
trkb
activation
quantification
changes
phospho-histone
h1
level
following
bdnf
stimulation
presence
absence
k252a
treatment
normalized
value
obtained
from
untreated
cultures
time
shown
histogram
cortical
neurons
treated
bdnf
min
lysates
immunoprecipitated
p35
antibody
immunoblotted
trkb
p35
cdk5
antibody
association
between
cdk5
p35
affected
bdnf
stimulation
association
between
p35
trkb
increased
following
min
bdnf
stimulationgst-pull
down
co-immunoprecipitation
assays
performed
characterize
interaction
coimmunoprecipitation
brca1
pp1
hek293t
kidney
cells
transfected
vectors
encoding
untagged
brca1
under
control
cmv
promoter
vectors
encoding
flag-pp1α
flag-laf4
western
blot
probed
brca1
shows
immunoprecipitation
protein
antibody
against
flag-pp1α
proteins
laf4
co-immunoprecipitates
brca1
lanes
1a-1d
noted
band
observed
slightly
lower
brca1
lane
1d
non-specific
background
band
lanes
1e-1h
show
immunoprecipitation
brca1
using
antibodies
against
amino
carboxy
termini
brca1
western
blot
probed
antibody
against
flag
epitope
lanes
2a-2d
indicate
immunoprecipitation
flag-epitope
tagged
pp1α
flag-laf4
lanes
2e-2g
show
co-immunoprecipitation
flag-pp1α
antibodies
against
brca1
lane
2h
shows
lack
coimmunoprecipitation
negative
control
flag-laf4
brca1uxt
previously
reported
expressed
almost
exclusively
inside
nucleus
most
cells
markus
et
al.
confirmed
investigation
either
endogenous
overexpressed
uxt
fig.
substantiate
interaction
p65
vitro
coimmunoprecipitation
assay
applied
full-length
ha-p65
flag-uxt
proteins
generated
labeled
respectively
35s
methionine
vitro
translation
products
mixed
immunoprecipitated
either
control
igg
anti-ha
antibody
shown
fig.
uxt
coprecipitated
antibody
against
ha
epitope
control
igg
suggests
uxt
indeed
interacts
directly
full-length
p65
address
physiological
relevance
interaction
mammalian
cells
expressed
ha-uxt
293t
cells
stimulated
cells
without
tnf-α
indicated
times
fractionated
cytoplasmic
nuclear
extracts
immunoprecipitated
either
anti-p65
antibody
igg
control
respectively
detectable
uxt
interacted
cytoplasmic
p65
presence
absence
tnf-α
fig.
consistent
unique
subcellular
location
uxt
addition
only
marginal
amount
endogenous
p65
nucleus
devoid
tnf-α
treatment
consequently
uxt
coimmunoprecipitated
from
nuclear
extract
even
though
existed
large
amount
uxt
contrast
exhibited
strong
interaction
between
nuclear
p65
uxt
upon
tnf-α
stimulation
furthermore
tested
whether
endogenous
uxt
p65
interact
response
tnf-α
shown
fig.
endogenous
uxt
coimmunoprecipitated
p65
antibody
from
cells
treated
tnf-α
contrast
uxt
barely
detected
immunoprecipitates
without
tnf-α
treatment
one
possible
explanation
phenomenon
only
p65
translocation
nucleus
uxt
access
p65
however
formally
rule
out
possibility
posttranslational
modifications
either
protein
prerequisites
interaction
vivo
collectively
results
indicate
uxt
interacts
vivo
p65
upon
tnf-α
stimulationsought
establish
whether
mitochondrial
localized
sirt3
may
also
form
physical
interaction
foxo
family
protein
foxo3a
using
co-immunoprecipitation
co-ip
techniques
carboxy-terminally
myc
tagged
wild-type
p-myc-hsirt3-wt
mutant
p-myc-hsirt3-mt
sirt3
expression
vectors
transfected
cos-7
cells
followed
co-ip
anti-myc
antibody
foxo3a
binds
sirt3
vitro
cos-7
cells
transfected
either
sirt3
wild-type
p-myc-hsirt3-wt
deacetylation
mutant
p-myc-hsirt3-mt
vectors
cell
lysates
immunoprecipitated
ipd
anti-myc
antibody
followed
western
analysis
anti-foxo3a
antibody
hct116
cell
lysates
ipd
either
anti-foxo3a
anti-sirt3
antibody
resolved
sds-page
immunoblotted
anti-foxo3a
antibody
mitochondrial
factions
from
hct116
cells
ipd
either
anti-foxo3a
anti-sirt3
antibody
immunoblotted
anti-foxo3a
antibody
cells
fixed
formaldehyde
crosslink
protein-dna
interactions
sonicated
fixed
cells
immunoprecipitated
either
anti-foxo3a
antibody