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Related Concept Videos

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...
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 Inner Chloroplast Membrane01:18

Protein Transport to the Inner Chloroplast Membrane

Proteins targeted to the inner chloroplast membrane, or plastid proteins, are transported by two general pathways: the stop-transfer and the re-insertion or post-import pathways. Most plastid proteins carry N-terminal transit sequences and internal import sequences targeting it to the specific chloroplast subcompartment. Proteins targeted by the stop-transfer pathway have internal hydrophobic sequences that inhibit their translocation into the stroma. As a result, these precursors are arrested...
Protein Complexes with Interchangeable Parts01:57

Protein Complexes with Interchangeable Parts

Groups of proteins may form a complex where each protein in this complex has a different role in the overall execution of the complex’s function. Often some of the proteins in the complex can be replaced by a closely related variant to give a complex that contains many of the same components yet is functionally distinct.
The SCF ubiquitin ligase is a protein complex of five individual proteins. This complex attaches ubiquitin to other target proteins to mark them for degradation. In order to...
Cell Signaling in Plants01:25

Cell Signaling in Plants

Plant cells communicate to coordinate their cycle of growth, flowering and fruiting, and activities in roots, shoots, and leaves in response to the changing environmental conditions. Plant signaling is distinct from animal signaling. Plants primarily utilize enzyme-linked receptors, whereas the largest class of cell-surface receptors in animals are G-protein coupled receptors (GPCRs). Unlike animals, receptor tyrosine kinases are rare in plants. Instead, plants have a diverse class of...
Riboswitches01:56

Riboswitches

Riboswitches are non-coding mRNA domains that regulate the transcription and translation of downstream genes without the help of proteins. Riboswitches bind directly to a metabolite and can form unique stem-loop or hairpin structures in response to the amount of the metabolite present. They have two distinct regions – a metabolite-binding aptamer and an expression platform.
The aptamer has high specificity for a particular metabolite which allows riboswitches to specifically regulate...

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Arabidopsis CSP41 proteins form multimeric complexes that bind and stabilize distinct plastid transcripts.

Yafei Qi1, Ute Armbruster, Christian Schmitz-Linneweber

  • 1Lehrstuhl für Molekularbiologie der Pflanzen (Botanik), Department Biologie I, Ludwig-Maximilians-Universität München, D-82152 Planegg-Martinsried, Germany. leister@lmu.de

Journal of Experimental Botany
|November 18, 2011
PubMed
Summary

CSP41b protein in Arabidopsis thaliana is essential for stabilizing chloroplast RNAs, particularly during the night. This stabilization impacts transcription and translation, suggesting a key role in regulating gene expression in plants.

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Area of Science:

  • Plant molecular biology
  • Chloroplast biology
  • Gene expression regulation

Background:

  • Spinach CSP41 protein binds and cleaves chloroplast RNA.
  • Arabidopsis thaliana has two CSP41 protein copies (CSP41a and CSP41b) involved in chloroplast rRNA metabolism and transcription.
  • CSP41a and CSP41b interact, but their distinct functions are unclear.

Purpose of the Study:

  • To investigate the distinct functions of CSP41a and CSP41b in Arabidopsis thaliana.
  • To determine the role of CSP41b in RNA-binding complexes and chloroplast RNA metabolism.
  • To elucidate the impact of CSP41b on chloroplast transcription and translation.

Main Methods:

  • RNA immunoprecipitation and hybridization to gene chips (RIP-chip) to identify CSP41 complex components.
  • Analysis of chloroplast RNA levels, transcription, and translation rates in wild-type and mutant plants.
  • In vitro RNA stability assays using chloroplast extracts.

Main Results:

  • CSP41b, but not CSP41a, is a major component of dark-induced RNA-binding complexes.
  • CSP41 complexes bind chloroplast mRNAs for photosynthetic proteins and rRNAs (16S, 23S).
  • Plants lacking CSP41b exhibit reduced target RNA levels, transcription, and translation, with decreased RNA stability.

Conclusions:

  • CSP41b is essential for stabilizing chloroplast target mRNAs and precursor rRNAs, particularly in the dark.
  • CSP41 complexes regulate chloroplast gene expression by maintaining RNA stability.
  • Defects in transcription and translation in CSP41b mutants are likely secondary to reduced RNA stability.