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Related Concept Videos

Regulation of Expression Occurs at Multiple Steps02:24

Regulation of Expression Occurs at Multiple Steps

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Gene expression can be regulated at almost every step from gene to protein. Transcription is the step that is most commonly regulated. This involves the binding of proteins to short regulatory sequences on the DNA. This association can either promote or inhibit the transcription of a gene associated with the respective sequence.
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Regulated Protein Degradation02:58

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It is vital to regulate the activity of enzymatic as well as non-enzymatic proteins inside the cell. This can be achieved either through creating a balance between their rate of synthesis and degradation or regulating the intrinsic activity of the protein. Both these regulation mechanisms play an essential role in the normal functioning of cells.
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Proteins can undergo many types of post-translational modifications, often in response to changes in their environment. These modifications play an important role in the function and stability of these proteins. Covalently linked molecules include functional groups, such as methyl, acetyl, and phosphate groups, and also small proteins, such as ubiquitin. There are around 200 different types of covalent regulators that have been identified.
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Predicting Products: SN1 vs. SN202:27

Predicting Products: SN1 vs. SN2

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Nucleophilic substitution reactions of alkyl halides can proceed via an SN1 or an SN2 mechanism. While in SN2 reactions, the nucleophile attacks the substrate simultaneously as the leaving group departs, in SN1 reactions, the substrate first dissociates to give the carbocation intermediate. Various factors such as the structure of the substrate, the strength of the nucleophile, and the nature of the solvent promote one mechanism over the other.
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Related Experiment Video

Updated: Jan 24, 2026

siRNA Screening to Identify Ubiquitin and Ubiquitin-like System Regulators of Biological Pathways in Cultured Mammalian Cells
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PRRSV nucleocapsid and nonstructural proteins dual-regulate CD40 expression via ATF-2 and AP-1 pathways.

Chaolun Fu1, Hongyan Gao1, Yingchao Li1

  • 1College of Veterinary Medicine, Shandong Agricultural University, Tai'an 271018, China.

Veterinary Microbiology
|January 22, 2026
PubMed
Summary

Porcine reproductive and respiratory syndrome virus (PRRSV) alters macrophage CD40 expression. PRRSV nucleocapsid protein upregulates CD40, while other viral proteins downregulate it, offering potential antiviral targets.

Keywords:
AP-1ATF-2Anti-viral drugCD40Nonstructural proteinsNucleocapsid proteinPRRSV

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Area of Science:

  • Immunology
  • Virology
  • Molecular Biology

Background:

  • Macrophage surface molecules are crucial for regulating inflammatory responses.
  • Porcine reproductive and respiratory syndrome virus (PRRSV) infects porcine alveolar macrophages, altering host surface receptor expression.
  • Understanding PRRSV's modulation of macrophage receptors is key to controlling infection.

Purpose of the Study:

  • To investigate the changes in immunoregulatory molecule expression on macrophages during PRRSV infection.
  • To identify specific PRRSV proteins involved in modulating CD40 expression.
  • To explore the functional consequence of CD40 modulation on PRRSV replication.

Main Methods:

  • Screening of immunoregulatory molecule expression in PRRSV-infected macrophages.
  • Reporter assays to assess the effect of viral proteins on CD40 promoter activity.
  • Analysis of transcription factor involvement (ATF-2, AP-1) in CD40 regulation.

Main Results:

  • CD40 was identified as the most significantly upregulated transcript in PRRSV-infected macrophages.
  • PRRSV nucleocapsid protein (N) enhanced CD40 promoter activity via ATF-2.
  • PRRSV nonstructural proteins Nsp1α, Nsp11, and Nsp12 suppressed CD40 promoter activity via AP-1.
  • Overexpression of CD40 restricted PRRSV replication.

Conclusions:

  • PRRSV differentially regulates CD40 expression through its nucleocapsid and nonstructural proteins.
  • CD40 plays a role in restricting PRRSV replication.
  • CD40 represents a potential therapeutic target for antiviral strategies against PRRSV.