Journal of Biological Chemistry,
Год журнала:
2024,
Номер
300(2), С. 105657 - 105657
Опубликована: Янв. 13, 2024
The
yeast
Snf1/AMP-activated
kinase
(AMPK)
maintains
energy
homeostasis,
controlling
metabolic
processes
and
glucose
derepression
in
response
to
nutrient
levels
environmental
cues.
Under
conditions
of
nitrogen
or
limitation,
Snf1
regulates
pseudohyphal
growth,
a
morphological
transition
characterized
by
the
formation
extended
multicellular
filaments.
During
is
required
for
wild-type
inositol
polyphosphate
(InsP),
soluble
phosphorylated
species
six-carbon
cyclitol
that
function
as
conserved
second
messengers.
InsP
are
established
through
activity
family
kinases,
including
Kcs1,
which
principally
generates
pyrophosphorylated
Cell,
Год журнала:
2024,
Номер
187(6), С. 1490 - 1507.e21
Опубликована: Март 1, 2024
Cell
cycle
progression
relies
on
coordinated
changes
in
the
composition
and
subcellular
localization
of
proteome.
By
applying
two
distinct
convolutional
neural
networks
images
millions
live
yeast
cells,
we
resolved
proteome-level
dynamics
both
concentration
during
cell
cycle,
with
resolution
∼20
classes.
We
show
that
a
quarter
proteome
displays
periodicity,
proteins
tending
to
be
controlled
either
at
level
or
concentration,
but
not
both.
Distinct
levels
protein
regulation
are
preferentially
utilized
for
different
aspects
being
mostly
involved
control
biophysical
implementation
program.
present
resource
exploring
global
which
will
aid
understanding
fundamental
biological
process
systems
level.
Developmental Cell,
Год журнала:
2024,
Номер
59(6), С. 740 - 758.e10
Опубликована: Фев. 16, 2024
The
lipid
droplet
(LD)
organization
proteins
Ldo16
and
Ldo45
affect
multiple
aspects
of
LD
biology
in
yeast.
They
are
linked
to
the
biogenesis
machinery
seipin,
their
loss
causes
defects
positioning,
protein
targeting,
breakdown.
However,
molecular
roles
remained
enigmatic.
Here,
we
report
that
Ldo16/45
form
a
tether
complex
with
Vac8
create
vacuole
(vCLIP)
contact
sites,
which
can
absence
seipin.
phosphatidylinositol
transfer
(PITP)
Pdr16
is
further
vCLIP-resident
recruited
specifically
by
Ldo45.
While
only
an
subpopulation
engaged
vCLIPs
at
glucose-replete
conditions,
nutrient
deprivation
results
vCLIP
expansion,
impair
lipophagy
upon
prolonged
starvation.
In
summary,
multifunctional
control
formation
metabolically
regulated
site.
Our
studies
suggest
link
between
breakdown
contribute
deeper
understanding
how
homeostasis
maintained
during
metabolic
challenges.
The
Rad53
DNA
checkpoint
protein
kinase
plays
multiple
roles
in
the
budding
yeast
cell
response
to
replication
stress.
Key
amongst
these
is
its
enigmatic
role
safeguarding
forks.
Using
reactions
reconstituted
with
purified
proteins,
we
show
phosphorylation
of
Sld3/7
or
Dbf4-dependent
blocks
initiation
whilst
Mrc1
Mcm10
slows
elongation.
necessary
and
sufficient
slow
forks
complete
reactions;
can
also
forks,
but
only
absence
unphosphorylated
Mrc1.
stimulates
unwinding
rate
replicative
helicase,
CMG,
prevents
this.
We
that
a
phosphorylation-mimicking
mutant
cannot
stimulate
vitro
partially
rescues
sensitivity
rad53
null
genotoxic
stress
vivo.
Our
results
protects
part
by
antagonising
stimulation
CMG
unwinding.
Genes,
Год журнала:
2021,
Номер
12(11), С. 1812 - 1812
Опубликована: Ноя. 18, 2021
During
each
cell
duplication,
the
entirety
of
genomic
DNA
in
every
must
be
accurately
and
quickly
copied.
Given
short
time
available
for
chore,
requirement
many
proteins,
daunting
amount
present,
replication
poses
a
serious
challenge
to
cell.
A
high
level
coordination
between
polymerases
other
chromatin-interacting
proteins
is
vital
complete
this
task.
One
most
important
maintaining
such
PCNA.
PCNA
multitasking
protein
that
forms
homotrimeric
ring
encircles
DNA.
It
serves
as
processivity
factor
acts
landing
platform
different
interacting
with
chromatin.
Therefore,
signaling
hub
influences
rate
accuracy
replication,
regulates
damage
repair,
controls
chromatin
formation
during
proper
segregation
sister
chromatids.
With
so
essential
roles,
recruitment
turnover
on
utmost
importance.
Three
different,
conserved
complexes
are
charge
loading/unloading
onto
Replication
C
(RFC)
canonical
complex
loading
S-phase.
The
Ctf18
Elg1
(ATAD5
mammalian)
form
similar
RFC,
particular
functions
cell’s
nucleus.
Here
we
summarize
our
current
knowledge
about
roles
these
factors
yeast
mammals.
Actively
maintained
close
appositions
between
organelle
membranes,
also
known
as
contact
sites,
enable
the
efficient
transfer
of
biomolecules
cellular
compartments.
Several
such
sites
have
been
described
well
their
tethering
machineries.
Despite
these
advances
we
are
still
far
from
a
comprehensive
understanding
function
and
regulation
most
sites.
To
systematically
characterize
site
proteomes,
established
high-throughput
screening
approach
in
Saccharomyces
cerevisiae
based
on
co-localization
imaging.
We
imaged
split
fluorescence
reporters
for
six
different
several
which
poorly
characterized,
background
1165
strains
expressing
mCherry-tagged
yeast
protein
that
has
punctate
distribution
(a
hallmark
sites),
under
strong
TEF2
promoter.
By
scoring
both
events
effects
reporter
size
abundance,
discovered
over
100
new
potential
residents
effectors
yeast.
Focusing
newly
identified
residents,
three
homologs
Vps13
Atg2
multiple
These
proteins
share
lipid
transport
domain,
thus
expanding
this
family
transporters.
Analysis
another
candidate,
Ypr097w,
now
call
Lec1
(Lipid-droplet
Ergosterol
Cortex
1),
revealed
previously
uncharacterized
dynamically
shifts
droplets
cell
cortex,
plays
role
ergosterol
cell.
Overall,
our
analysis
expands
universe
creates
rich
database
to
mine
functions,
tethers,
regulators.
Nature Communications,
Год журнала:
2023,
Номер
14(1)
Опубликована: Май 8, 2023
Many
proteins
involved
in
eukaryotic
phosphate
homeostasis
are
regulated
by
SPX
domains.
In
yeast,
the
vacuolar
transporter
chaperone
(VTC)
complex
contains
two
such
domains,
but
mechanistic
details
of
its
regulation
not
well
understood.
Here,
we
show
at
atomic
level
how
inositol
pyrophosphates
interact
with
domains
subunits
Vtc2
and
Vtc3
to
control
activity
VTC
complex.
inhibits
catalytically
active
subunit
Vtc4
homotypic
SPX-SPX
interactions
via
conserved
helix
α1
previously
undescribed
α7.
Binding
abrogates
this
interaction,
thus
activating
Accordingly,
activation
is
also
achieved
site-specific
point
mutations
that
disrupt
interface.
Structural
data
suggest
ligand
binding
induces
reorientation
exposes
modifiable
α7,
which
might
facilitate
post-translational
modification
vivo.
The
variable
composition
these
regions
within
domain
family
contribute
diversified
functions
homeostasis.