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Riboswitches01:56

Riboswitches

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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.
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Ribosome synthesis is a highly complex and coordinated process involving more than 200 assembly factors. The synthesis and processing of ribosomal components occurs not only in the nucleolus but also in the nucleoplasm and the cytoplasm of eukaryotic cells.
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Transcriptional Regulation: Riboswitches01:23

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Riboswitches are RNA elements that regulate gene expression by altering their secondary structures in response to specific effector molecules. These elements, located in the leader regions of certain mRNAs, act as transcriptional regulators by toggling between alternative conformations to control downstream gene expression. Riboswitch-mediated regulation is a precise mechanism for modulating biosynthetic pathways, as exemplified by the riboflavin biosynthesis pathway in Bacillus...
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Translational Regulation01:29

Translational Regulation

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Translational regulation in prokaryotes ensures efficient protein synthesis by controlling ribosome access to mRNA. This regulation is mediated by secondary RNA structures, including translational riboswitches, RNA thermometers, and small RNAs (sRNAs), which respond to intracellular and environmental signals to modulate gene expression.Translational RiboswitchesRiboswitches in the leader region of mRNAs can regulate translation by altering the accessibility of the Shine-Dalgarno (SD) sequence,...
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Regulation of Expression at Multiple Steps01:23

Regulation of Expression at Multiple Steps

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The gene expression in cells is regulated at different stages: (i) transcription, (ii) RNA processing, (iii) RNA localization, and (iv) translation. Transcriptional regulation is mediated by regulatory proteins such as transcription factors, activators, or repressors—these control gene expression by initiating or inhibiting the transcription of genes. Once a precursor or pre-mRNA is produced, it undergoes post-transcriptional modification, including 5' capping, splicing, and the...
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Investigating Interactions Between Histone Modifying Enzymes and Transcription Factors in vivo by Fluorescence Resonance Energy Transfer
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Narrow Leaf21, encoding ribosomal protein RPS3A, controls leaf development in rice.

Muhammad Uzair1, Haixin Long1, Syed Adeel Zafar1

  • 1National Key Facility for Crop Gene Resources and Genetic Improvement, Institute of Crop Sciences, Chinese Academy of Agricultural Sciences, Beijing 100081, China.

Plant Physiology
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Area of Science:

  • Plant Biology
  • Molecular Genetics
  • Crop Science

Background:

  • Leaf morphology is crucial for plant productivity, but its molecular basis remains unclear.
  • Understanding leaf development mechanisms is key to improving crop yield.
  • The narrow leaf21 (nal21) mutant offers insights into rice leaf development.

Purpose of the Study:

  • To identify and characterize the genetic basis of the narrow leaf phenotype in rice.
  • To elucidate the molecular mechanisms regulating rice leaf development.
  • To investigate the role of ribosomal protein RPS3A in leaf morphology.

Main Methods:

  • Map-based cloning was used to identify the gene responsible for the nal21 mutation.
  • Microscopy was employed to examine leaf blade and vascular system defects.
  • Ribosome profiling and antibiotic assays assessed ribosomal function.
  • Analysis of auxin response factors (ARFs) and OsWOX3A gene expression and translation.

Main Results:

  • The nal21 mutant exhibits reduced leaf width, length, plant height, and altered vascular systems.
  • NAL21 was identified as RPS3A, a ribosomal small subunit protein.
  • The nal21 mutant shows impaired 40S ribosome subunit availability and aberrant auxin responses.
  • RPS3A regulates the translation of specific ARFs and OsWOX3A via upstream open-reading frames (uORFs).

Conclusions:

  • Ribosomal protein RPS3A plays a critical role in rice leaf development by controlling translation.
  • Translational regulation of ARFs and OsWOX3A through uORFs is essential for normal leaf morphology.
  • This study reveals a novel mechanism linking ribosome function to plant development and morphology.