Related Experiment Video
Updated: May 10, 2026
11:20
Affinity Purification of Influenza Virus Ribonucleoprotein Complexes from the Chromatin of Infected Cells
Published on: June 3, 2012
Influenza virus transcription and replication.
Jaime Martín-Benito1, Juan Ortín
1Centro Nacional de Biotecnología-CSIC, Madrid, Spain.
Advances in Virus Research
|July 2, 2013
Summary
Influenza A viruses cause significant health and economic burdens. This study details the organization, structure, and interactions within their ribonucleoprotein complexes (RNPs), explaining viral genome transcription and replication mechanisms.
Area of Science:
- Virology
- Molecular Biology
- Structural Biology
Background:
- Influenza A viruses are responsible for annual epidemics and pandemics, posing a substantial global health and economic threat.
- The viral genome comprises eight single-stranded, negative-polarity RNA segments.
- These RNA segments associate with viral proteins to form ribonucleoprotein complexes (RNPs).
Purpose of the Study:
- To elucidate the organizational principles of influenza A virus ribonucleoprotein complexes (RNPs).
- To describe the structure and interactions of the molecular components within RNPs.
- To discuss the mechanisms governing viral RNA transcription and replication by RNPs.
Main Methods:
- Structural analysis of RNP components.
- Biochemical assays to study protein-protein and protein-RNA interactions.
- Functional studies on viral RNA transcription and replication.
Main Results:
- Detailed characterization of the structural organization of influenza A virus RNPs.
- Identification of key interactions between RNA polymerase subunits, nucleoprotein, and viral RNA.
- Insights into the dynamic mechanisms of RNP-mediated genome replication and transcription.
Conclusions:
- Understanding RNP organization and function is crucial for controlling influenza A virus.
- The elucidated mechanisms provide a basis for developing novel antiviral strategies.
- Further research into RNP dynamics could reveal new therapeutic targets.
Related Concept Videos
01:27Influenza
Influenza is an acute, highly communicable viral disease that affects the respiratory tract and is responsible for seasonal epidemics worldwide. Influenza A is the most prevalent type associated with widespread outbreaks and is subtyped based on two surface glycoproteins: hemagglutinin (H) and neuraminidase (N), as in H1N1. These glycoproteins are essential for viral infectivity, transmission, and immune recognition. Transmission occurs primarily through respiratory droplets and contaminated...
02:28Leaky Scanning
During most eukaryotic translation processes, the small 40S ribosome subunit scans an mRNA from its 5' end until it encounters the first start AUG codon. The large 60S ribosomal subunit then joins the smaller one to initiate protein synthesis. The location of the translation initiation is largely determined by the nucleotides near the start codon as there may be multiple translation initiation sites present on the mRNA. Marilyn Kozak discovered that the sequence RCCAUGG (where R stands for...
01:29Viruses with RNA Genomes
RNA viruses are categorized into positive-strand, negative-strand, or double-stranded groups based on their genomic structure and replication mechanisms. This classification dictates how they exploit host cellular machinery for protein synthesis and replication. Some RNA viruses also utilize reverse transcription as part of their life cycle, further diversifying their replication strategies.Positive-Strand RNA VirusesPositive-strand RNA viruses have genomes that function directly as messenger...
01:30Inhibitors of Viral Protein Synthesis
Protein synthesis is indispensable for viral replication, as viruses lack the cellular machinery required for this process and must hijack the host's translational apparatus. In response, host cells deploy a critical innate immune defense involving interferons, specialized cytokines that play a central role in inhibiting viral propagation.Upon viral detection, infected cells release interferons that bind to receptors on adjacent uninfected cells, activating the JAK-STAT signaling pathway and...
01:10Retrovirus Life Cycles
Retroviruses have a single-stranded RNA genome that undergoes a special form of replication. Once the retrovirus has entered the host cell, an enzyme called reverse transcriptase synthesizes double-stranded DNA from the retroviral RNA genome. This DNA copy of the genome is then integrated into the host’s genome inside the nucleus via an enzyme called integrase. Consequently, the retroviral genome is transcribed into RNA whenever the host’s genome is transcribed, allowing the retrovirus to...
01:53Bacterial Transcription
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.
Transcription can be divided into three main stages, each involving distinct DNA sequences to guide the polymerase. These are:
Transcription can be divided into three main stages, each involving distinct DNA sequences to guide the polymerase. These are: