A Multi Organism Process in Which a Virus Is a Participant. the Other Participant Is the Host. Includes Infection of a Host Cell Replication of the Viral Genome and Assembly of Progeny Virus Particles. in Some Cases the Viral Genetic Material May Integrate Into the Host Genome and Only Subsequently Under Particular Circumstances 'complete' Its Life Cycle.
Any Process in Which a Virus Stops Prevents or Reduces the Frequency Rate or Extent of Gene Expression in the Host Organism. Gene Expression Is the Process in Which a Gene's Coding Sequence Is Converted Into a Mature Gene Product or Products (proteins or Rna). This Includes the Production of an RNA Transcript As Well As Any Processing to Produce a Mature RNA Product or an MRNA (for Protein Coding Genes) and the Translation of That MRNA Into Protein. Some Protein Processing Events May Be Included When They Are Required to Form an Active Form of a Product From an Inactive Precursor Form.
The Protein Coat That Surrounds the Infective Nucleic Acid in Some Virus Particles; the Subunits Are Arranged to Form a Protein Helix with the Genetic Material Contained Within. Tobacco Mosaic Virus Has Such a Capsid Structure.