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Related Concept Videos

Bacterial RNA Polymerase00:43

Bacterial RNA Polymerase

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Unlike eukaryotes, bacteria use a single RNA Polymerase (RNAP) to transcribe all genes. The different subunits of bacterial RNAPhave distinct functions. The multisubunit structure of the bacterial RNAP helps the enzyme to maintain catalytic function, facilitate assembly, interact with DNA and RNA, and self-regulate its activity.
In most genes, the transcription site is a single base present upstream of the coding sequence. Though RNAP is a catalytically efficient enzyme, it does not recognize...
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The Upf proteins that carry out nonsense-mediated decay (NMD) are found in all eukaryotic organisms, including humans. Each protein has an individual role, but they need to work in collaboration. Upf1 is an ATP-dependent RNA helicase that unwinds the RNA helix. Because Upf1 can unwind any RNA, Upf2 and Upf3 are required to help Upf1 discriminate between nonsense and normal mRNAs.
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Nucleophilic Aromatic Substitution: Addition–Elimination (SNAr)01:30

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Nucleophilic substitution in aromatic compounds is feasible in substrates bearing strong electron-withdrawing substituents positioned ortho or para to the leaving group. The reaction proceeds via two steps: the addition of the nucleophile and the elimination of the leaving group.
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Ribosomal RNA Synthesis02:53

Ribosomal RNA Synthesis

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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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Bacterial Transcription01:53

Bacterial Transcription

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RNA polymerase (RNAP) carries out DNA-dependent RNA synthesis in both bacteria and eukaryotes. Bacteria do not have a membrane-bound nucleus. So, transcription and translation occur simultaneously, on the same DNA template.
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Related Experiment Video

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A Reporter Based Cellular Assay for Monitoring Splicing Efficiency
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U1 snRNP telescripting: molecular mechanisms and beyond.

Yi Ran1, Yanhui Deng1, Chengguo Yao1,2

  • 1Center for Stem Cell Biology and Tissue Engineering, Key Laboratory for Stem Cells and Tissue Engineering, Ministry of Education, Sun Yat-Sen University, Guangzhou, China.

RNA Biology
|January 8, 2021
PubMed
Summary

U1 small nuclear ribonucleoprotein (snRNP) regulates eukaryotic mRNA length by inhibiting 3'-end processing. This review details the mechanisms of U1 snRNP telescripting and its role in mRNA metabolism.

Keywords:
U1 snRNP telescriptingco-transcriptional mRNA processingmRNA polyadenylationmRNA splicingpremature cleavage and polyadenylation (PCPA)

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Area of Science:

  • Molecular Biology
  • Gene Regulation
  • RNA Processing

Background:

  • U1 small nuclear ribonucleoprotein (snRNP) is a highly abundant ribonucleoprotein complex in eukaryotic cells.
  • While known for mRNA splicing, U1 snRNP also regulates mRNA length by inhibiting 3'-end processing at intronic polyadenylation sites.
  • This process is known as U1 snRNP telescripting and impacts mRNA metabolism.

Purpose of the Study:

  • To review the current understanding of the mechanisms underlying U1 snRNP telescripting.
  • To discuss the implications of U1 snRNP telescripting in mRNA metabolism.
  • To highlight open questions and future research directions in this field.

Main Methods:

  • Literature review of existing studies on U1 snRNP function.
  • Analysis of research on mRNA 3'-end processing and polyadenylation.
  • Synthesis of information regarding the regulatory role of U1 snRNP in gene expression.

Main Results:

  • U1 snRNP actively inhibits mRNA 3'-end processing at specific intronic sites.
  • Telescripting by U1 snRNP influences the final length of mature mRNAs.
  • This mechanism represents a significant layer of post-transcriptional gene regulation.

Conclusions:

  • U1 snRNP plays a critical, multifaceted role in eukaryotic gene expression beyond splicing.
  • Understanding U1 snRNP telescripting mechanisms is crucial for comprehending mRNA metabolism.
  • Further research is needed to fully elucidate the complexities and implications of U1 snRNP telescripting.