Related Experiment Video

Updated: Sep 28, 2026

Generation of Escape Variants of Neutralizing Influenza Virus Monoclonal Antibodies
07:55

Generation of Escape Variants of Neutralizing Influenza Virus Monoclonal Antibodies

Published on: August 29, 2017

Restriction of viral replication by mutation of the influenza virus matrix protein

Teresa Liu1, Zhiping Ye

  • 1Laboratory of Pediatric and Respiratory Viral Diseases, Division of Viral Products, Food and Drug Administration, Building 29A, 8800 Rockville Pike, Bethesda, MD 20892, USA.

Journal of Virology
|November 20, 2002
PubMed

Insights

The influenza virus matrix protein (M1) is crucial for viral replication. The RKLKR domain, essential for ribonucleoprotein (RNP) binding, is vital for M1 function and viral survival.

Area of Science:

  • Virology
  • Molecular Biology
  • Structural Biology

Background:

  • The influenza virus matrix protein (M1) is essential for viral assembly and ribonucleoprotein (RNP) complex formation.
  • M1 protein's association with viral RNA and nucleoprotein facilitates RNP helical formation and nuclear export during replication.

Purpose of the Study:

  • To investigate the role of M1 protein's RNP-binding domains in influenza virus assembly and replication.
  • To elucidate the specific functions of the zinc finger motif and the RKLKR domain in M1 protein.

Main Methods:

  • Site-directed mutagenesis was used to create mutations in the RKLKR and zinc finger motifs of the M1 protein.
  • Mutated M1 genes were introduced into wild-type influenza virus using reverse genetics.
  • Viral growth, RNP nuclear export, and replication efficiency were assessed.

Main Results:

  • Mutations in the zinc finger motif had minimal impact on viral growth.
  • Specific substitutions within the RKLKR domain (at positions 101 or 105) did not significantly affect RNP nuclear export or viral replication.
  • Deletion or specific substitutions (at positions 102 or 104) within the RKLKR domain resulted in lethal mutations, indicating its critical role.

Conclusions:

  • The RKLKR domain of the influenza virus M1 protein is indispensable for viral replication.
  • The RKLKR domain's integrity is essential for M1 function, likely through its role in RNP binding and subsequent viral assembly processes.

More Related Videos

Co-immunoprecipitation of the Mouse Mx1 Protein with the Influenza A Virus Nucleoprotein09:39

Co-immunoprecipitation of the Mouse Mx1 Protein with the Influenza A Virus Nucleoprotein

Published on: April 21, 2015

Affinity Purification of Influenza Virus Ribonucleoprotein Complexes from the Chromatin of Infected Cells11:20

Affinity Purification of Influenza Virus Ribonucleoprotein Complexes from the Chromatin of Infected Cells

Published on: June 3, 2012

Related Concept Videos

Leaky Scanning02:28

Leaky 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...
Inhibitors Of Virion Release01:25

Inhibitors Of Virion Release

Viral replication and dissemination rely on efficient mechanisms for host cell entry, genome replication, assembly, and release. Influenza viruses, such as types A and B, are negative-sense single-stranded RNA viruses with a segmented genome, that depend on two critical surface glycoproteins to carry out these processes: hemagglutinin (HA) and neuraminidase (NA). HA initiates infection by binding to sialic acid residues on the surface of host epithelial cells, facilitating receptor-mediated...
Viral Mutations00:36

Viral Mutations

A mutation is a change in the sequence of bases of DNA or RNA in a genome. Some mutations occur during replication of the genome due to errors made by the polymerase enzymes that replicate DNA or RNA. Unlike DNA polymerase, RNA polymerase is prone to errors because it is not capable of “proofreading” its work. Viruses with RNA-based genomes, like HIV, therefore accrue mutations faster than viruses with DNA-based genomes. Because mutation and recombination provide the raw material for adaptive...
Inhibitors of Viral Protein Synthesis01:30

Inhibitors 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...
Inhibitors of Virion Maturation and Assembly01:19

Inhibitors of Virion Maturation and Assembly

As part of their replication cycle, certain viruses synthesize long precursor proteins called polyproteins within infected host cells. In human immunodeficiency virus (HIV), two major polyproteins are produced: Gag and Gag-Pol. The Gag polyprotein supplies the structural components of the virus, while Gag-Pol includes essential viral enzymes such as reverse transcriptase, integrase, and protease. After synthesis, these polyproteins move to the host cell membrane, where they assemble into an...
Influenza01:27

Influenza

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...