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Related Concept Videos

Mitochondria01:37

Mitochondria

Mitochondria are eukaryotic cellular organelles that are known to produce energy through a process called oxidative phosphorylation. Besides their primary function, mitochondria are involved in various cellular processes, including cell growth, differentiation, signaling, metabolism, and senescence. Age-related changes cause a decline in mitochondrial quality and integrity due to increased mitochondrial mutations and oxidative damage. Thus, aging can severely impact mitochondrial functions,...
Mitochondria01:37

Mitochondria

Mitochondria are eukaryotic cellular organelles that are known to produce energy through a process called oxidative phosphorylation. Besides their primary function, mitochondria are involved in various cellular processes, including cell growth, differentiation, signaling, metabolism, and senescence. Age-related changes cause a decline in mitochondrial quality and integrity due to increased mitochondrial mutations and oxidative damage. Thus, aging can severely impact mitochondrial functions,...
Mitochondrial Membranes01:45

Mitochondrial Membranes

A single mitochondrion is a bean-shaped organelle enclosed by a double-membrane system. The outer membrane of mitochondria is smooth and contains many porins - the integral membrane transporters. Porins enable free diffusion of ions and small uncharged molecules through the outer mitochondrial membrane but limit the transport of molecules larger than 5000 Daltons. Further, the outer mitochondrial membrane forms a unique structure called membrane contact sites with other subcellular organelles,...
Mitochondrial Membranes01:45

Mitochondrial Membranes

A single mitochondrion is a bean-shaped organelle enclosed by a double-membrane system. The outer membrane of mitochondria is smooth and contains many porins - the integral membrane transporters. Porins enable free diffusion of ions and small uncharged molecules through the outer mitochondrial membrane but limit the transport of molecules larger than 5000 Daltons. Further, the outer mitochondrial membrane forms a unique structure called membrane contact sites with other subcellular organelles,...
Protein Transport to the Outer Chloroplast Membrane01:11

Protein Transport to the Outer Chloroplast Membrane

Chloroplast outer membrane proteins encoded by the nucleus are synthesized in the cytosol. Soon after synthesis, they bind cytosolic factors such as 14-3-3 protein and the Hsp70 chaperones that keep these precursors in an unfolded state until their translocation.
Two models describe the mechanism of precursor recognition and entry across the outer membrane through the TOC complex. Model 1 suggests the newly synthesized precursor binds to the TOC receptor 159 and forms a complex.
Protein Transport to the Stroma01:24

Protein Transport to the Stroma

Chloroplasts are triple membrane structures with an outer membrane, an inner membrane, and a thylakoid membrane, each containing distinct metabolite transporters, membrane translocons, and enzymes. Appropriate sorting and translocating these proteins to their correct membrane systems is essential for chloroplast function.
Protein complexes called the translocon of the outer chloroplast membrane or TOC complex, and the translocon of the inner chloroplast membrane or TIC complex mediate the...

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Mitochondrial dysfunction affects chloroplast functions.

Maria V Busi1, Maria E Gomez-Lobato, Alejandro Araya

  • 1Instituto de Investigaciones Biotecnológicas, Instituto Tecnológico de Chascomús (IIB-INTECH) CONICET/UNSAM, Chascomús, Argentina.

Plant Signaling & Behavior
|November 22, 2011
PubMed
Summary
This summary is machine-generated.

Mitochondrial dysfunction in plant flowers impacts genes for metabolism and photosynthesis. This study reveals altered chlorophyll metabolism and suggests retrograde signaling between plant genomes.

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Area of Science:

  • Plant Molecular Biology
  • Genomics
  • Biochemistry

Background:

  • Mitochondrial dysfunction can impact overall plant cell function.
  • Understanding inter-organelle communication is crucial for plant physiology.

Purpose of the Study:

  • To characterize the transcriptomic response to mitochondrial dysfunction in Arabidopsis flower tissues.
  • To investigate the link between mitochondrial dysfunction and chloroplastic functions.

Main Methods:

  • Transcriptomic analysis of A9:u-ATP9 and apetala3:u-ATP9 lines.
  • Gene expression profiling of metabolic, stress, and photosynthetic genes.
  • Measurement of chlorophyll levels and Mg-dechelatase activity.

Main Results:

  • Mitochondrial dysfunction altered genes involved in carbon/nitrogen metabolism, stress, and transcription.
  • Expression of photosynthetic genes, including chlorophyllase, chlorophyll binding proteins, and PSII, was affected.
  • Reduced chlorophyll levels and increased Mg-dechelatase activity indicated altered chlorophyll metabolism.

Conclusions:

  • Mitochondrial dysfunction negatively impacts chloroplastic functions.
  • The study provides a model for investigating retrograde signaling between plant genomes.