The ISME Journal,
Journal Year:
2023,
Volume and Issue:
17(9), P. 1358 - 1368
Published: July 14, 2023
Ammonia
oxidising
archaea
are
among
the
most
abundant
living
organisms
on
Earth
and
key
microbial
players
in
global
nitrogen
cycle.
They
carry
out
oxidation
of
ammonia
to
nitrite,
their
activity
is
relevant
for
both
food
security
climate
change.
Since
discovery
nearly
20
years
ago,
major
insights
have
been
gained
into
carbon
metabolism,
growth
preferences
mechanisms
adaptation
environment,
as
well
diversity,
abundance
environment.
Despite
significant
strides
forward
through
cultivation
novel
omics-based
approaches,
there
still
many
knowledge
gaps
metabolism
which
enable
them
adapt
microorganisms
typically
considered
metabolically
streamlined
highly
specialised.
Here
we
review
physiology
archaea,
with
focus
aspects
metabolic
versatility
regulation,
discuss
these
traits
context
nitrifier
ecology.
Cell,
Journal Year:
2024,
Volume and Issue:
187(13), P. 3357 - 3372.e19
Published: June 1, 2024
Microbial
hydrogen
(H2)
cycling
underpins
the
diversity
and
functionality
of
diverse
anoxic
ecosystems.
Among
three
evolutionarily
distinct
hydrogenase
superfamilies
responsible,
[FeFe]
hydrogenases
were
thought
to
be
restricted
bacteria
eukaryotes.
Here,
we
show
that
anaerobic
archaea
encode
diverse,
active,
ancient
lineages
through
combining
analysis
existing
new
genomes
with
extensive
biochemical
experiments.
are
encoded
by
nine
archaeal
phyla
expressed
H2-producing
Asgard
archaeon
cultures.
We
report
an
ultraminimal
in
DPANN
binds
catalytic
H-cluster
produces
H2.
Moreover,
identify
characterize
remarkable
hybrid
complexes
formed
fusion
[NiFe]
ten
other
orders.
Phylogenetic
structural
modeling
suggest
a
deep
evolutionary
history
hydrogenases.
These
findings
reveal
metabolic
adaptations
archaea,
streamlined
H2
catalysts
for
biotechnological
development,
surprisingly
intertwined
between
two
major
H2-metabolizing
enzymes.
Angewandte Chemie International Edition,
Journal Year:
2022,
Volume and Issue:
61(51)
Published: Oct. 17, 2022
Hydrogen
(H2
)
is
a
geological
source
of
reducing
electrons
that
thought
to
have
powered
the
metabolism
last
universal
common
ancestor
all
extant
life,
and
still
metabolized
by
various
modern
organisms.
It
has
been
suggested
H2
drove
geochemical
analogue
some
or
reverse
Krebs
cycle
at
emergence
metabolic
network,
catalyzed
metals,
but
this
yet
be
demonstrated
experimentally.
Herein,
we
show
three
consecutive
steps
cycle,
converting
oxaloacetate
into
succinate,
can
driven
without
enzymes
in
one-pot
as
agent
under
mild
conditions
compatible
with
biological
chemistry.
Low
catalytic
amounts
nickel
(10-20
mol
%)
platinum
group
metals
(0.1-1
even
small
ground
meteorites
were
found
promote
reductive
chemistry
temperatures
between
5
60
°C
over
wide
pH
range,
including
7.
These
results
lend
additional
support
hypothesis
geologically
produced
hydrogen
metal
catalysts
could
initiated
early
networks.
Nature Communications,
Journal Year:
2024,
Volume and Issue:
15(1)
Published: April 15, 2024
Abstract
Diverse
aerobic
bacteria
use
atmospheric
hydrogen
(H
2
)
and
carbon
monoxide
(CO)
as
energy
sources
to
support
growth
survival.
Such
trace
gas
oxidation
is
recognised
a
globally
significant
process
that
serves
the
main
sink
in
biogeochemical
H
cycle
sustains
microbial
biodiversity
oligotrophic
ecosystems.
However,
it
unclear
whether
archaea
can
also
.
Here
we
show
thermoacidophilic
archaeon,
Acidianus
brierleyi
(Thermoproteota),
constitutively
consumes
CO
sub-atmospheric
levels.
Oxidation
occurs
across
wide
range
of
temperatures
(10
70
°C)
enhances
ATP
production
during
starvation-induced
persistence
under
temperate
conditions.
The
genome
A.
encodes
canonical
dehydrogenase
four
distinct
[NiFe]-hydrogenases,
which
are
differentially
produced
response
electron
donor
acceptor
availability.
Another
Metallosphaera
sedula
,
oxidize
Our
results
suggest
common
trait
Sulfolobales
may
play
role
their
survival
niche
expansion,
including
dispersal
through
environments.
Journal of Experimental Botany,
Journal Year:
2022,
Volume and Issue:
73(17), P. 5851 - 5862
Published: April 14, 2022
Abstract
Melatonin,
a
molecule
that
was
first
identified
in
animal
tissues,
has
been
confirmed
to
be
involved
as
potential
phytohormone
variety
of
plant
physiological
responses.
It
is
considered
primarily
an
antioxidant
with
important
actions
controlling
reactive
oxygen
and
nitrogen
species.
In
addition
its
role
regulating
growth
development,
phytomelatonin
protection
against
abiotic
biotic
stresses.
The
‘gasotransmitter’—that
is,
gaseous
signaling
molecule—is
new
concept
advanced
the
past
two
decades,
functions
regulation.
Gasotransmitters
including
nitric
oxide,
carbon
monoxide,
hydrogen
sulfide,
methane,
and,
more
recently
identified,
gas
are
critical
indispensable
wide
range
biological
processes.
This
review
investigates
interrelationship
between
above-mentioned
gasotransmitters
from
perspective
biosynthetic
origin
functions.
Moreover,
future
research
directions
for
interactions
discussed.
