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@ARTICLE{Mielke:890970,
author = {Mielke, Kati and Wagner, Raik and Mishra, Laxmi S and
Demir, Fatih and Perrar, Andreas and Huesgen, Pitter F and
Funk, Christiane},
title = {{A}bundance of metalloprotease {F}ts{H}12 modulates
chloroplast development in {A}rabidopsis thaliana},
journal = {The journal of experimental botany},
volume = {72},
number = {9},
issn = {1460-2431},
address = {Oxford},
publisher = {Oxford Univ. Press},
reportid = {FZJ-2021-01286},
pages = {3455–3473},
year = {2021},
abstract = {The ATP-dependent metalloprotease FtsH12 (filamentation
temperature sensitive protein H 12) has been suggested to
participate in a heteromeric motor complex, driving protein
translocation into the chloroplast. FtsH12 was
immuno-detected in proplastids, seedlings, leaves, and
roots. Expression of Myc-tagged FtsH12 under its native
promotor allowed identification of FtsHi1, 2, 4, and 5, and
plastidic NAD-malate dehydrogenase, five of the six
interaction partners in the suggested import motor complex.
Arabidopsis thaliana mutant seedlings with reduced FTSH12
abundance exhibited pale cotyledons and small, deformed
chloroplasts with altered thylakoid structure. Mature plants
retained these chloroplast defects, resulting in slightly
variegated leaves and lower chlorophyll content. Label-free
proteomics revealed strong changes in the proteome
composition of FTSH12 knock-down seedlings, reflecting
impaired plastid development. The composition of the
translocon on the inner chloroplast membrane (TIC) protein
import complex was altered, with coordinated reduction of
the FtsH12-FtsHi complex subunits and accumulation of the 1
MDa TIC complex subunits TIC56, TIC214 and TIC22-III. FTSH12
overexpressor lines showed no obvious phenotype, but still
displayed distinct differences in their proteome.
N-terminome analyses further demonstrated normal proteolytic
maturation of plastid-imported proteins irrespective of
FTSH12 abundance. Together, our data suggest that FtsH12 has
highest impact during seedling development; its abundance
alters the plastid import machinery and impairs chloroplast
development.},
cin = {ZEA-3},
ddc = {580},
cid = {I:(DE-Juel1)ZEA-3-20090406},
pnm = {217 - Für eine nachhaltige Bio-Ökonomie – von
Ressourcen zu Produkten (POF4-217) / ProPlantStress -
Proteolytic processing in plant stress signal transduction
and responses to abiotic stress and pathogen attack
(639905)},
pid = {G:(DE-HGF)POF4-217 / G:(EU-Grant)639905},
typ = {PUB:(DE-HGF)16},
pubmed = {33216923},
UT = {WOS:000707097500010},
doi = {10.1093/jxb/eraa550},
url = {https://juser.fz-juelich.de/record/890970},
}