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Related Concept Videos

Ribosomal RNA Synthesis02:53

Ribosomal RNA Synthesis

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.
Ribosome biogenesis begins with the synthesis of 5S and 45S pre-rRNAs by distinct RNA polymerases. The primary transcripts are extensively processed and modified before they are bound and folded by ribosomal proteins and assembly factors,...
Ribosomal RNA Synthesis02:53

Ribosomal RNA Synthesis

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.
Ribosome biogenesis begins with the synthesis of 5S and 45S pre-rRNAs by distinct RNA polymerases. The primary transcripts are extensively processed and modified before they are bound and folded by ribosomal proteins and assembly factors,...
Pre-mRNA Processing: Modification of pre-mRNA Ends01:35

Pre-mRNA Processing: Modification of pre-mRNA Ends

In eukaryotic cells, transcripts made by RNA polymerase are modified and processed before exiting the nucleus. Unprocessed RNA is called precursor mRNA or pre-mRNA to distinguish it from mature mRNA.
Once about 20-40 ribonucleotides have been joined together by RNA polymerase, a group of enzymes adds a cap to the 5' end of the growing transcript. In this process, a 5' phosphate is replaced by modified guanosine that has a methyl group attached (7-methyl guanosine). This 5' cap helps the cell...
pre-mRNA Processing02:01

pre-mRNA Processing

In eukaryotic cells, transcripts made by RNA polymerase are modified and processed before exiting the nucleus. Unprocessed RNA is called precursor mRNA or pre-mRNA to distinguish it from mature mRNA.
Once about 20-40 ribonucleotides have been joined together by RNA polymerase, a group of enzymes adds a “cap” to the 5’ end of the growing transcript. In this process, a 5’ phosphate is replaced by modified guanosine that has a methyl group attached to it (7-Methyl guanosine). This 5’ cap helps the...
Pre-mRNA Processing02:01

Pre-mRNA Processing

In eukaryotic cells, transcripts made by RNA polymerase are modified and processed before exiting the nucleus. Unprocessed RNA is called precursor mRNA or pre-mRNA to distinguish it from mature mRNA.
Once about 20-40 ribonucleotides have been joined together by RNA polymerase, a group of enzymes adds a “cap” to the 5’ end of the growing transcript. In this process, a 5’ phosphate is replaced by modified guanosine that has a methyl group attached to it (7-Methyl guanosine). This 5’ cap helps the...
Transfer RNA Synthesis02:36

Transfer RNA Synthesis

One of the unique features of tRNA is the presence of modified bases. In some tRNAs, modified bases account for nearly 20% of the total bases in the molecule. Altogether, these unusual bases protect the tRNA from enzymatic degradation by RNases.
Each of these chemical modifications is carried by a specific enzyme, post-transcription. All of these enzymes have unique base and site-specificity. Methylation, the most common chemical modification, is carried by at least nine different enzymes, with...

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Ribonucleoproteins in archaeal pre-rRNA processing and modification.

W S Vincent Yip1, Nicholas G Vincent, Susan J Baserga

  • 1Department of Molecular Biophysics and Biochemistry, Yale University School of Medicine, New Haven, CT 06510, USA.

Archaea (Vancouver, B.C.)
|April 5, 2013
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Archaeal small ribonucleoprotein (sRNP) machines are crucial for ribosomal RNA (rRNA) maturation, guiding pre-rRNA processing and nucleotide modifications. Discovering their components and structures offers new insights into ribosome biogenesis.

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Area of Science:

  • Molecular Biology
  • Biochemistry
  • Genetics

Background:

  • Ribosome biogenesis is a fundamental cellular process essential for protein synthesis.
  • Maturation of ribosomal RNAs (rRNAs) involves precise cleavage, folding, and nucleotide modifications.
  • Ribonucleoprotein (RNP) machines, specifically small RNPs (sRNPs) in Archaea and small nucleolar RNPs (snoRNPs) in Eukarya, are central to rRNA processing.

Purpose of the Study:

  • To introduce archaeal rRNA gene organization and pre-rRNA processing.
  • To highlight the discovery and functions of archaeal sRNP components.
  • To elucidate the structures of archaeal sRNPs involved in nucleotide modification.

Main Methods:

  • Review of existing literature on archaeal rRNA gene organization and pre-rRNA processing.
  • Analysis of studies focusing on the identification and characterization of archaeal sRNP components.
  • Examination of structural and functional data related to archaeal sRNPs and nucleotide modification.

Main Results:

  • Detailed overview of archaeal rRNA gene organization and the pathways of pre-rRNA processing.
  • Identification and functional characterization of key components within archaeal sRNPs.
  • Insights into the structural basis of archaeal sRNP-mediated nucleotide modification of rRNAs.

Conclusions:

  • Archaeal sRNPs play a vital role in rRNA maturation, analogous to eukaryotic snoRNPs.
  • Understanding archaeal sRNPs provides crucial insights into the evolution and mechanisms of ribosome biogenesis.
  • Further structural and functional studies of archaeal sRNPs will enhance our knowledge of these essential cellular machines.